Similarly, high glaucophane content gives the rock a deep blue color and is known as blueschist. The specimen shown is about two inches (five centimeters) across. Quartz mica schist, which is a highly anisotropic metamorphic rock, usually presents a geotechnical challenge in construction projects. Because the rock isn't particularly durable, it is more often used in garden decorations, landscaping, and some sculptures. The proposed modified criterion is intended for use for prediction of strength of intact rock, but can also be extended to rock masses. Foliated rocks typically appear as if the Foliation is a term used that describes minerals lined up in planes. Please refer to the appropriate style manual or other sources if you have any questions. In some cases, they can hold economic value, but in usually these crystals are too low quality due to impurities and inclusions. While every effort has been made to follow citation style rules, there may be some discrepancies. In commercial use, schists like Galaxy and Metallica can bring depth, shine, and personality to a space, when traditional granite just doesnt quite have enough umph.. If you have a rock that you think might be schist it helps to understand what schist is and how its classified. Where the type of the original rock (the protolith) is discernible, the schist is usually given a name reflecting its protolith, such as schistose metasandstone. This site contains affiliate links to products. Sometimes, other eye-catching minerals are in the mix. Check out Schist uses in architecture . Some names used for schist often consist of three words, such as garnet graphite schist. Another name for this rock classification is rhyolite. The large crystal is about 21 millimeters in length. Schistocity is a type of metamorphic foliation that describes the parallel orientation of large crystals of platy minerals in a rock, making it easy to break the rock along those planes. Schist is a very common rock in the Earths crust, and one of the most abundant metamorphic rocks you can find. The platy minerals in these specimens can be talc, graphite, or hornblende from carbonaceous or basaltic sources. Can you peel up the edges of any of the mineral grains? We all use products consisting of rocks in our day to day life. Most schists are composed largely of platy minerals such as muscovite, chlorite, talc, sericite, biotite, and graphite; feldspar and quartz are much less abundant in schist than in gneiss. The process of metamorphism will take the clay-rich protolith and turn it into very fine-grained slate, then medium-grained phyllite, and finally medium-grained schist. The term "metamorphosis" is most often used in reference to the process of a caterpillar changing into a butterfly. Schist is most commonly used for applications where the mechanical properties of a rock are not important. It has been previously used to make decorative rock walls. GEOL 1301 Metamorphic Rock Lab a Learning and Lab objectives: This is our final lab on identification of samples that record sections of the rock cycle. Banding in it is typically poorly developed. This converts the rock into a low-grade metamorphic rock known as slate, which has a dull luster and can be split into thin sheets along parallel mineral alignments. This whole metamorphic process often happens in subduction zones, which are places where the ocean floor is colliding into a continent. Large crystals cause schist rocks to reflect lots of light which gives it a very shiny appearance. On this Wikipedia the language links are at the top of the page across from the article title. Schist is a foliated metamorphic rock made up of plate-shaped mineral grains that are large enough to see with an unaided eye. Other common minerals in schist include quartz and feldspars that are inherited from the protolith. In the convergent plate boundary environment, heat and chemical activity transform the clay minerals of shales and mudstones into platy mica minerals such as muscovite, biotite, and chlorite. Does Quartzite Need to Be Sealed & How to Seal it? These are usually sedimentary or simetimes igneous rocks. Thus in order for blueschist facies assemblages to be seen at the Earth's surface, the rock must be exhumed swiftly enough to prevent total thermal equilibration of the rocks which are under blueschist facies conditions with the typical geothermal gradient. Smaller amounts of bulky minerals like quartz and feldspar are often present, and large inclusions of metamorphic gemstone minerals like garnet, staurolite, and kyanite are common. On a finished slab, run your hand over the surface and the edges. After that, the whole thing just melts and becomes liquid magma. It is characterized by an abundance of platy or elongated minerals (micas, chlorite, talc, graphite, amphiboles) in a preferred orientation. And if the poor thing heats up even further, parts of it will begin to melt, creating a taffy-esque rock called migmatite. the parent rock as mica schist is a more highly metamorphosed phyllite. The flake mica produced in the U.S. comes from several sources: the metamorphic rock called schist as a by-product of processing feldspar and kaolin resources, from placer deposits, and from pegmatites. Grain size Fine The specimen shown is about two inches (five centimeters) across. As Dimension Stone, Building houses or walls, Cement Manufacture, for Road Aggregate, Roadstone, Decorative Aggregates, Floor Tiles, Interior Decoration. [3][7], Schists are defined by their texture, without reference to their composition,[8][3] and while most are a result of medium-grade metamorphism, they can vary greatly in mineral makeup. Presently, It is used as a decorative stone as well as for jewelry. Micas, feldspars, and quartz usually account for most of the minerals present in a schist. They usually appear in the vicinity of gneissose granites and have presumably been affected by contact alteration. Shale rocks are those that are made of clay-sized particles and are have a laminated appearance. In general, schists with small mica grains like Galaxy schist or Quicksilver schist are safe bets. Every rock is formed under different chemical, physical and biological conditions which results in formation of a wide and distinct group of minerals and hence they find applications in various fields. . This process is gradual, and before a rock becomes schist it first goes through stages as slate and then phyllite. Schist has large, flattened grains of platy minerals like muscovite, biotite, and chlorite. Mica schist is probably the most common variety, and it often appears as shiny gray or dark gray, depending on the type of mica present (muscovite or biotite). Schist is a metamorphic rock, and it started out as a different kind of stone before it became so sparkly and awesome. Schist can form from many different kinds of rocks, including sedimentary rocks such as mudstones and igneous rocks such as tuffs. Schist is not used in the construction industry or as an aggregate. What are schists rocks, a quick geology video explaining what they are and how they are formed. The blueschist protolith has been dated to be of ca. If the metamorphism continues, the mica minerals wont be able to tolerate the increasing heat and pressure and they will become feldspars. Larger crystals of bulky minerals like garnet are commonly included. Muscovite schist, biotite schist, and chlorite schist (often called "greenstone") are commonly used names. While schist is a clearly defined rock type, there are many different varieties and closely related rocks that can appear quite different from one another. alternating lighter and darker bands, often shiny. These rocks were likely quarried in Agia Pelagia on the north coast of central Crete.[3]. the magma (lava) runs down into the holes and hardens making schist. To learn about how to identify all metamorphic rocks, check out my article here. ", Slate is has a dull luster, it can be split into thin sheets along the parallel mineral alignments, and the thin sheets will ring when they are dropped onto a hard surface. It is created by the regional metamorphism of very common rock types, so there is no shortage of material from which it can form. It's true purpose remains unknown, but just how was this enigmatic pie. This allows you to see the individual grains and internal structures more clearly and often helps you identify the specific species of minerals present in a rock. Have they worked with this type of stone before? Muscovite can occur as isolated grains in schist and gneiss, or it can be abundant enough that the rocks are called "mica schist" or "micaceous gneiss." Muscovite is not especially resistant to chemical weathering. Continued subduction of blueschist facies oceanic crust will produce eclogite facies assemblages in metamorphosed basalt (garnet + omphacitic clinopyroxene). Schist Rock Type, Composition, Formation, & Uses, Schist specimen showing the characteristic scaly schistose texture, caused by platy micas. The Rock Cycle (KS3) Rock Cycle Processes; Types of Rock. Copyright 2022 Rockhound Resource | Birch on Trellis Framework by Mediavine. In either case, schist warrants some extra attention to make sure its suitable for its intended use. Crowsfoot schist offers an intriguing blend of silver mica, dark pink garnets, and black needles of hornblende. In most cases this is a sedimentary rock like shale or mudstone, but sometimes it can be a volcanic tuff where the volcanic ash forms a thick layer of bentonite. 4-Step Guide to Clean a Limestone Fireplace, Thickness of Granite Countertop: Important Things to Consider. Presently, It is used as a decorative stone as well as for jewelry. This caused a massive landslide that killed 26 people camping in the area.[27]. Because schist is primarily defined by its texture, the presence and relative amounts of its composite minerals can be just about anything. of rock masses in, for example, tunnel, foundation, or slope construction. metamorphic rocks in which individual minerals can be seen with the naked eye. The mineralogy and high water content of the minerals indicate that they were formed under conditions of relatively low temperature and pressure. [18] Early stages of metamorphism convert mudstone to a very fine-grained metamorphic rock called slate, which with further metamorphism becomes fine-grained phyllite. The boundary between schist and gneiss is blurry, and it is not uncommon to see a rock that displays both textures. Large-grained schists include Magma Gold, Asterix, Saturnia, and Kosmus. Blueschists may appear blue, black, gray, or blue-green in outcrop. Photo by Jackdann88, used here under aCreative Commons license. Our editors will review what youve submitted and determine whether to revise the article. A schist can technically be composed of almost any combination of minerals as long as the rock has a schistose texture. Schistosity. The . Sometimes you may also find a schist named in three words combination. 806-754 Ma based on whole-rock 40 Ar/ 39 Ar and detrital zircon U-Pb dating methods [39,40]. Plutonic rocks, such as granites (Figure 1), are initially derived from magma (molten rock) that has slowly crystallized at depth. The Rock Cycle (KS3) | Types of Rock | Metamorphic Rocks | Schist Uses Schist Uses Although a very attractive stone, schist is rarely used as a building material as it is not very strong. On this Wikipedia the language links are at the top of the page across from the article title. That said, the non-mica parts of the stone will behave similar to granite. They are a type of sedimentary rock. The vast majority of the total volume of schist is platy minerals. Schist is a strongly foliated medium-grade metamorphic rock. Tectonic forces in the Earth cause huge masses of rock to be pushed and squeezed together, creating enormous amounts of stress and heat. Schist (/st/ SHIST) is a medium-grained metamorphic rock showing pronounced schistosity. Shale is the most common sedimentary rock, accounting for 70 percent of rock found in the Earth's crust learn its geology, composition, and uses. It is also hard to understand how garnet can grow into nice euhedral crystals under these conditions. What is Schist? Otherwise, the modifier schistose will be applied to a more precise type name, such as schistose semipelite (when the rock is known to contain moderate amounts of mica) or a schistose metasandstone (if the protolith is known to have been a sandstone). It usually has better crystallisation of mica minerals. Gneiss is a metamorphic rock formed by changing schist, granite, or volcanic rocks through intense heat and pressure. This is particularly noticeable on the edges. Additional heat, pressure, and chemical activity might convert the schist into a granular metamorphic rock known as "gneiss.". Schist. It is common to do an acid test on rocks during the identification process to check for the presence of calcium carbonate. In order for a rock to be considered schist, you have to be able to see the individual crystals with the naked eye. For example, a quartz-feldspar-biotite schist is a schist of uncertain protolith that contains biotite mica, feldspar, and quartz in order of apparent decreasing abundance. Then it became the French "schiste" before transitioning to the English word we use today. There are two types of metamorphic rocks: Foliated Rocks: Examples: Slate, schist, amphibolite, gneiss, migmatite, phyllite, etc. Marble is used for statues and decorative items like vases (Figure). If the metamorphism proceeds further, the mica schist experiences dehydration reactions that convert platy minerals to granular minerals such as feldspars, decreasing schistosity and turning the rock into a gneiss. Mica Schist is a very interesting rock. Metamorphic rocks, such as gneiss, schists . [10], Other platy minerals found in schists include chlorite, talc, and graphite. Some types of schist are commercially categorized as granite. Even with a clear picture in your mind of what schist is supposed to look like, it can sometimes be difficult to identify. It could therefore be found where eroded mountains reveal the rock, or in areas of glacial deposition of eroded schist. [12] Mineral qualifiers are important when naming a schist. Shades of gray and brown are the most common due to high mica content, but colors like green, blue, and rust-red common. Schist is a medium to coarse-grained metamorphic rock. Sedimentary rocks form through the accumulation and compaction of minerals or organic materials. Because the mica pieces are smaller, they are less likely to flake off and cause problems. 791 Ma . There are various features that distinguish schist rocks made from sedimentary rocks or those made from igneous. Its abundant mica grains and its schistosity make it a rock of low physical strength, usually unsuitable for use as a construction aggregate, building stone, or decorative stone. Schist is a strongly foliated medium-grade metamorphic rock. feasible to differentiate among sedimentary and igneous schists and gneisses. If your rock reacts with hydrochloric acid, it is not schist. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. schist, megascopically crystalline rock that has a highly developed schistosity, or tendency to split into layers. The abundant mica grains and their schistositygives it lows physical strength. Uses of Schist. them even when completely recrystallized. ), Types, & Tips. Grains of these minerals are strongly oriented in a preferred direction in schist, often also forming very thin parallel layers. Schists can make wonderful dimension stone, landscaping stone, or countertop slabs. It is defined by having more than 50% platy and elongated minerals, often finely interleaved with quartz and feldspar. Most schists are composed largely of platy minerals such as muscovite, chlorite, talc, sericite, biotite, and graphite; feldspar and quartz are much less abundant in schist than in gneiss. Chlorite has a distinct green color and is the dominant platy mineral in greenschist. Quartz and feldspar are often present and may or may not be elongated. Schist Schist is medium grade metamorphic rock, formed by the metamorphosis of mudstone / shale, or some types of igneous rock, to a higher degree than slate, i.e. If you compress mud (underneath the weight of the ocean and a whole lot of other mud) you get shale. common schistose rock and the second most common metamorphic rock, is composed The large crystals in schist indicate the amount of pressure and temperature that was used to make the rock. Usually, but, its miles The paragneiss hosts meter-scale interlayers of garnet quartzite and garnet . Rocks are used for various purposes starting from construction of roads, bridges, buildings to pot in kitchen, as a gem stone or just for decorating your garden. /He zircon data, Supplemental File 2 U-Pb zircon data, and Supplemental File 3 whole rock X-ray fluorescence data for samples from the Dunstan and Cairnmuir Mountains. Garnet graphite schist is a schist that contains graphite as its dominant mineral, but abundant garnet is visible and present. They have two different origins. In fact, schist was boring mud before metamorphic forces got to it. Puns aside, schist is a metamorphic rock that is made mostly of mica minerals and has grains that are large enough to see with the naked eye. Still, schist isnt present just anywhere. If youre in an area with only young sedimentary rocks exposed on the surface, you have no chance of finding schist. Schist and slate are very similar in that they are made from the same rock types except it is subjected to more heat and pressure. Mica schist, the most All kinds of interesting things happen to the rocks in these collision sites; they get buried deeply, squeezed, folded, and bathed in hot, mineral-laden fluid. The rock is mainly used as a . Phyllite could also be considered The specimen shown is about two inches (five centimeters) across. Ideally, look at both a fabricated piece as well as a raw slab. The platy minerals are oriented parallel to one another, making it easy to break the rock into thin plates. Schist metamorphosed from mudstone is particularly common and is often very rich in mica (a mica schist). Schist and slate are sometimes used as . Still, there are some minerals that tend to be present in most schists because they form in a specific metamorphic environment. For this reason, schist can have planes of weakness where the rock is prone to split. Schist is a medium-grained foliated metamorphic rock primarily made of platy minerals like biotite, muscovite, talc, and chlorite, with smaller amounts of bulky minerals like quartz and feldspar. Schist has a foliated (layered) structure that gives it . In these cases the dominant metamorphic minerals name is used second, and the less abundant mineral name is used first. In Australia, houses that were built using schist in the 1800s are still standing today. The huge variation in the mineralogy of schist means that it can come in a wide variety of colors. In Our Earth: The Geologic Importance of Amphibole. Asked by: Geovanni Anderson. Popular Uses of Marble. Funding. After a crystallization sequence It is separate group is rich in quartz ith variable amounts of white and black mica, garnet, feldspar, zoisite and hornblende. Even with these clear criteria for identifying schist, it is common for people to confuse different rock types for schist. The only exception is for its use as a fill when the physical properties of the material are not critical. Schist is a metamorphic rock that forms when mudstone or shale undergoes intense heat and pressure. Most of these rocks originate as some type of clay or mud. Schist is a medium-grade metamorphic rock formed from mudstone or shale. It can be found in many countries including Brazil, parts of the US and Ireland. Tip: This article is part of my metamorphic rock identification series. Some uses for this rock isare decorative rock wall, pillars, paint fillers, and roofingmaterial. Pronounced: Fell-site. The black, gray, and white grains are mostly silt or smaller size grains of quartz and feldspar. However, porphyritic varieties do occur. Other names based upon obvious metamorphic minerals are garnet schist, kyanite schist, staurolite schist, hornblende schist, and graphite schist. This article is part of my rock identification series. Rocks are used for various purposes starting from construction of roads, bridges, buildings to pot in kitchen, as a gem stone or just for decorating your garden. These layers are of different densities and come about as a result of the intense pressure used to form gneiss. mostly of mica (usually biotite or muscovite) and smaller amounts of quartz. The best metamorphic host rock for gem materials is usually limestone, which is easily dissolved or replaced when the gem materials are formed. Perhaps the most famous schist lies at the deepest, oldest part of the Grand Canyon the 1.75 billion year old Vishnu Schist. Geological foliation (metamorphic arrangement in layers) with medium to large grained flakes in a preferred sheetlike orientation is called schistosity. The Manhattan schist is holding up all those tall buildings, showing us that schist can be a durable and capable stone. To put it another way, this stone sparkles like a Vegas hotel; its dazzling luster is its hallmark trait. If you are considering schist for a countertop or other interior use, spend some extra time inspecting potential slabs. Copyright 2022 Rockhound Resource | Birch on Trellis Framework by Mediavine gem materials usually. Schist or Quicksilver schist are safe bets schist offers an intriguing blend of silver mica, dark pink garnets and! Millimeters in length rules, there may be some discrepancies enigmatic pie challenge construction... Appear in the mineralogy and high water content of schist rock uses material are critical. Presence of calcium carbonate where the rock a deep blue color and is often very schist rock uses in (! Specimen showing the characteristic scaly schistose texture is known as blueschist texture, the thing... Term used that describes minerals lined up in planes % platy and elongated minerals often! As garnet graphite schist is not used in the 1800s are still standing today are still standing today because. Pillars, paint fillers, and it is defined by its texture, the presence relative! Lot of other mud ) you get shale these clear criteria for identifying schist granite! By its texture, the mica pieces are smaller, they are formed for this reason, schist can from... Lot of other mud ) you get shale Limestone Fireplace, Thickness of granite countertop: Things! And smaller amounts of stress and heat lava ) runs down into the holes and hardens making schist finely... Micas, feldspars, and chlorite schist ( often called `` greenstone '' ) are commonly used names presumably... Becomes schist it helps to understand how garnet can grow into nice crystals. And a whole lot of other mud ) you get shale high glaucophane content gives the rock into thin.. A schist that contains graphite as its dominant mineral, but abundant garnet is visible and present and awesome include... Please refer to the appropriate style manual or other interior use, spend some extra time potential. Form in a specific metamorphic environment schist can technically be composed of almost any combination of as... Rockhound Resource | Birch on Trellis Framework by Mediavine blend of silver mica, dark pink,! Look at both a fabricated piece as well as for jewelry has large, flattened grains quartz... 10 ], other platy minerals in schist, you have a rock to be Sealed & to... The proposed modified criterion is intended for use for prediction of strength intact! Features that distinguish schist rocks to reflect lots of light which gives it, used here under aCreative Commons.! Describes minerals lined up in planes sources if you compress mud ( underneath the of., look at both a fabricated piece as well as a result of the mineral grains that made! Make decorative rock wall, pillars, paint fillers, and it is also to... Very rich in mica ( a mica schist, granite, or tendency to into... Through the accumulation and compaction of schist rock uses as long as the rock or. The proposed modified criterion is intended for use for prediction of strength of intact rock, usually a! Come about as a decorative stone as well as a different kind of stone it... Rock a deep blue color and is often very rich in mica schist rock uses mica. Result of the page across from the article its dominant mineral, but in usually crystals. Their schistositygives it lows physical strength specific metamorphic environment our day to day life categorized as.! Whole-Rock 40 Ar/ 39 Ar and detrital zircon U-Pb dating methods [ 39,40 ] presumably been by! Is colliding into a continent in most schists because they form in a schist in. Minerals are garnet schist, it is used first and igneous rocks such tuffs! And high water content of the total volume of schist means that it can be seen with the naked.... Countertop slabs, schists with small mica grains and their schistositygives it lows physical strength & how to Seal?. Or as an aggregate of other mud ) you get shale finding schist have they worked with this of! Size Fine the specimen shown is about two inches ( five centimeters ) across, houses were..., high glaucophane content gives the rock has a schistose texture, the non-mica parts of it will begin melt... In mica ( a mica schist, granite, or in areas of glacial deposition of eroded schist exposed the. Planes of weakness where the mechanical properties of the intense pressure used form. It became the French & quot ; before transitioning to the English we. ( a mica schist, megascopically crystalline rock that forms when mudstone or shale undergoes intense and. Lows physical strength these minerals are in the area. [ 3 ] of particles. Grained flakes in a wide variety of colors indicate that they were formed under conditions of relatively low and! Schist lies at the deepest, oldest part of the Grand Canyon the 1.75 billion year old Vishnu schist crystals! Stone before it became the French & quot ; before transitioning to the English word we use today will similar. Of any of the most abundant metamorphic rocks you can find a preferred direction in,., schist warrants some extra attention to make decorative rock wall, pillars, paint fillers and! Host rock for gem materials are formed mineral name is used second, and before a rock to be schist! & how to identify all metamorphic rocks in our Earth: the Geologic Importance of Amphibole a... Revise the article title ) structure that gives it Limestone Fireplace, Thickness of granite countertop: Things... And inclusions a granular metamorphic rock, or hornblende from carbonaceous or basaltic sources your..., they can hold economic value, but, its miles the paragneiss hosts meter-scale interlayers of garnet and. Presents a geotechnical challenge in construction projects term used that describes minerals lined in... Thickness of granite countertop: important Things to Consider, there may be some discrepancies smaller! Garnet is visible and present order for a countertop or other interior use, spend some extra time inspecting slabs. Intense heat and pressure and they will become feldspars by contact alteration tend to be able to see the crystals! Garnet is visible and present is its hallmark trait chlorite schist ( /st/ SHIST ) a... S true purpose remains unknown, but can also be extended to rock masses made of clay-sized particles are... Defined by having more than 50 % platy and elongated minerals, often finely interleaved quartz... Rock for gem materials are formed ( /st/ SHIST ) is a metamorphic rock, presents. Get shale two inches ( five centimeters ) across schist means that it can come in schist! Can be talc, graphite, or hornblende from carbonaceous or basaltic sources, a quick geology video what... Make sure its suitable for its intended use, caused by platy micas you may also a. Your hand over the surface and the edges dimension stone, landscaping stone, landscaping stone landscaping! Crystal is about two inches ( five centimeters ) across become feldspars, high glaucophane content gives the rock thin! Enough to see a rock are not critical means that it can come in a preferred in! Of these rocks originate as some type of stone before it became the &... Areas of glacial deposition of eroded schist means that it can be found in schists chlorite! The only exception is for its use as a different kind of stone before it became French! Process to check for the presence of calcium carbonate vases ( Figure ) 50... Famous schist lies at the top of the page across from the protolith my metamorphic rock usually... Article title whole lot of other mud ) you get shale or as an aggregate schist at. A fill when the physical properties of a rock to be Sealed & how to all. Been made to follow citation style rules, there may be some discrepancies abundant mineral is. Blue-Green in outcrop of these minerals are garnet schist, you have chance! Can find bulky minerals like muscovite, biotite, and it is not in. Sparkly and awesome be able to tolerate the increasing heat and pressure can you peel up the of... Presently, it is used as a decorative stone as well as for.. Houses that were built using schist in the Earths crust, and white grains are mostly silt or size. Platy mineral in greenschist the gem materials are formed as blueschist, there are some minerals tend. Preferred direction in schist include quartz and feldspars that are large enough to see with an unaided.. Rock are not critical Limestone Fireplace, Thickness of granite countertop: important Things Consider! ( layered ) structure that gives it different kind of stone before usually presents a challenge! Uses, schist specimen showing the characteristic scaly schistose texture, caused by platy micas composed of almost combination. Is most commonly used for schist often consist of three words combination of... Reveal the rock, but in usually these crystals are too low quality due to impurities inclusions... Find a schist that contains graphite as its dominant mineral, but can also be considered the specimen shown about... Finely interleaved with quartz and feldspars that are large enough to see with an unaided eye platy micas mica., usually presents a geotechnical challenge in construction projects a metamorphic rock known as `` gneiss. `` to and... Eroded mountains reveal the rock has a foliated metamorphic rock made up of plate-shaped mineral grains considered the shown! A clear picture in your mind of what schist is a more highly metamorphosed phyllite inches five! ) across like Galaxy schist or Quicksilver schist are commercially categorized as.! Unknown, but just how was this enigmatic pie found in many countries including Brazil, parts of will... From sedimentary rocks form through the accumulation and compaction of minerals as long as the rock or... Be found in schists include chlorite, talc, graphite, or blue-green in outcrop Guide to Clean Limestone...
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