Geolex — Hillabee publications - USGS Chlorite is the group name for about 10 related minerals. . Representative archaeological finds of pietra ... - Springer quartzite. If trying to distinguish between the two, look for other minerals in the rock (garnet and biotite). mica schist, green schist (green because of high chlorite content), garnet schist, actinolite schist, biotite schist etc. Used as an insulator and in electrical devices. What is the hardness of schist? - Answers The area rock units consist of meta-ophiolites The geological structure is complicated by multiple (serpentinite, metagabbro, metabasite, chlorite schist, folding associated with shear zones and brittle fault talc schist) and meta-sediments (calc schist and silicate zones, but the general attitude of rock units forms a M. Sapigni et al . Lies between Ashland mica schist and Talladega slate. Squeezing deformation control during ... - ScienceDirect.com Schist is a metamorphic rock that comes in almost infinite variety, but its main characteristic is hinted at in its name: Schist comes from the ancient Greek for "split," through Latin and French. strinaers H. A dark qreen bands Structure bedding planes have minor (2-4") folds S rolls BCA 450 Bedding planes parallel A) terat Ion epidote chlorite epidote chlorite Mineral-izat ion Po Py Core tecov. It occurs in the quartz, albite, sericite, chlorite, garnet assemblage of pelitic schist. schist, or fine- to medium-grained, garnetiferous, muscovite-chlorite-feldspar-quartz gneiss. Chlorite is a colorless crystal with green-colored inclusions. Varieties of this rock type share similarities in appearance (schistosity) but may be highly variable in composition. . Biotite. 3. With it are mixed portions of boulders of various kinds of rocks, such as serpentine, quartzite, mica-schist, chlorite-schist, gneiss, granite, &c. All this " blue ground " has evidently been subjected to heat. It seemed evident that the talc of this locality is an alteration product of the schist. Cyprus Miami (MRDS #10186051) CU, MO It is characterized by an abundance of platy or elongated minerals (micas, chlorite, talc, graphite, amphiboles) in a preferred orientation. foliated garnet, muscovite, biotite regional metamorphism medium grade see crystals shale parent rock. Chlorite is also a common metamorphic mineral, usually indicative of low-grade metamorphism. These differ in their crystal, granular and lamellar structures and in hardness and color. It has a rating of 7 in the Mohs hardness scale. Schist, gneiss, granodiorite, granite*, rhyolite*. Composition and Hardness GDS: grunerite-dominant schist SDP: siderite-dominant phyllite CQS: chlorite-quartz schist Notes: • In the Homestake, in upper greenschist facies, siderite phyllite is dominant, whereas in lower amphibolite facies, grunerite is schist is dominant. That is, these will be found in slate, schist and gneiss. It mainly comprises talc and mica. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot, mineral-rich fluids or, more commonly, some combination of these factors. However, the term Chlorite can be used both to describe the group in general, or as a specific term to describe any green member of the Chlorite group whose exact identity is not practical to be determined. The alpine areas of origin of this lithotype are Valtellina, Valchiavenna and Val Bregaglia. D. A STUDENT MEASURED THE MASS OF A SAPLE OF QUARTZ 3 TIMES. Platy cleavage (sheets). That mineral suite is taken as a sign of the pressure and temperature that made it. The stone is a variety of serpentine and is mainly composed of magnesium silicate; it is divided into two main groups: talc schist, the main component of which is talc, and chlorite schist, mainly composed of chlorite. Individual mineral grains are discernible by the naked eye, and this property sets it apart from slate. Subduction Related Metamorphism - At a subduction zone, the oceanic crust is pushed downward resulting in the basaltic crust and ocean floor sediment being subjected to relatively high pressure. chlorite, Muscovite regional metamorphism medium grade shale parent rock. Amphibolite facies represents, metamorphic . It formed by metamorphosis of mudstone and shale or some form of igneous rock. The Phyllite rock is formed by the slate that is further metamorphosed so that the coarse-grained mica attain a preferred accommodation. The above classification can be abbreviated by the deletion of mineral names from the left to right as desired. One derived from shale may be a muscovite-biotite schist, or just a mica schist, or if there are garnets present it might be mica-garnet schist. Schist. Talc is usually light green in color. What does schist look like? Microscopical description: the schist has a strong fabric, with phyllosilicate-rich layers alternating with quartz-rich ones. Platy cleavage (sheets). Minerals can be classified according to their chemical composition or Moh's hardness scale, see Figure 1. Hardness - generally hard. However, the term Chlorite can be used both to describe the group in general, or as a specific term to describe any green member of the Chlorite group whose exact identity is not practical to be determined. Muscovite, talc, biotite, graphite, chlorite, and sericite. THE MASS WS THE SAME THE FIRST AND SECOND TIMES, BUT WAS . having low values on the Mohs hardness scale: c. 1 for soapstones (Robertson 1982), and. The Hillabee forms the major mafic stratigraphic horizon in the northern Alabama Piedmont. Actually, chlorite is a group of phyllosilicate minerals, a common example of which is chamosite chlorite: (Fe+2,Mg,Fe+3)5Al(Si3,Al)O10(OH,O)8 - iron magnesium hydroxy-oxy-aluminosilicate. It comprises quartz-muscovite with lesser amounts of chlorite and haematite plus trace amounts of albite, calcite, zircon, apatite and tourmaline. Chlorite schist from the Precambrian of Michigan, USA. It's an allusion to the crystal's common color, but it's actually a silicate mineral. 9 '5" 15'6" Assay i BDF12 Hi Tr Asso . Other features - generally smoothish to touch. 4-5 is the relative hardness indicate by the Moh's scale against other rocks and minerals. nonfoliated quartz Greenschists often have some foliation resulting in mineral alignment, especially of chlorite . The mineral type immediately preceding the rock name is the most diagnostic. Our samples of pietra ollare may be assigned to chlorite and magnesite‐bearing talc‐schists. Chlorite minerals are found in rocks altered during deep burial, plate collisions, hydrothermal activity, or contact metamorphism. In composition there are many varieties, named after some conspicuous mineral; as, mica schist, chlorite schist, talc schist, hornblende schist, quartz schist, etc. Chlorite schist, plane polars Chlorite schist, crossed polars Chlorite in augen gneiss, plane polars Chlorite in augen gneiss, crossed polars The soft stones mostly used in Aegean glyptic are steatite, chlorite, schist, serpentine, sepiolite, fluorite, calcite, and alabaster. Muscovite ( Si:Al> 3:1 ) b. Amphibolite Facies: This facies is found in medium to high grade metamorphic terrains. Biotite in Hand Sample. Browse a full range of Rock and Mineral Specimens and Collections products from leading suppliers. They are biotite, chlorite and muscovite so this called schistosity texture. with chlorite bands becoming more chloritic down Greenstones - chlorite schist Hardness 3-4 thin qtz. Hardness 2.5-4. Schist is a strongly foliated medium-grade metamorphic rock. Hardness 3. All soft stones are indigenous to Crete. It is characterized by a distinctive equidimensional 12-sided crystal form, glassy luster, high hardness and absence of cleavage. The Amphibole group is a categorization of rock-forming inosilicate minerals. Schist Schist is a strongly foliated medium-grade metamorphic rock. The word Phyllite is derived from the Greek phyllon meaning " leaf". The most common talc-bearing rocks are talc schist and soapstone. Schist is formed when shale undergoes metamorphism. Garnet is a medium-grade silicate mineral commonly found in schist and gneiss. Olivine is rare. DARK PURPLISH TRACHYTE TUFF OR FLOW Mixture of TALC CHLORITE SCHIST (me ta volcanic s) and thin TRACHYTIC TUFFS OP. Synmetamorphic quartz veins, commonly with minor albite, muscovite and chlorite, have been emplaced parallel to the foliation in micaceous horizons. It should . Amphiboles are found in many igneous and metamorphic rocks. It commonly shows irregular foliation or slick, polished surfaces (slickensides) due to shearing in fault zones. it has been subjected to higher temperatures and pressures.The resulting foliation is coarser and more distinct than that of slate due to the higher degree of crystallisation of mica minerals ( biotite, chlorite, muscovite) forming . chlorite schist (Cretaceous) a nd conglomerate (Pliocene). Slate is fine-grained and is used for decorating gardens, roofing and flooring, and making gravestones and snooker tables. The chlorite and talc are the minerals with low Moh's hardness. assemblages of green-schist facies include chlorite, chloritoid, epidote, actinolite, muscovite, albite (anorthite< 7% ) and quartz. Although the appearance of rocks is ever-changing, from their formation environment, that is, from the genesis, rock can be divided into three categories: sedimentary rocks, magmatic rocks and metamorphic rocks. Oronoque Schist - Gray to silver, medium- to fine-grained, well-layered to laminated schist and granofels, composed of quartz, oligoclase, or albite, muscovite or sericite, biotite, or chlorite, and in western belt local garnet, staurolite, and kyanite. Schist is made mostly of quartz (mohs 7) and feldspar (mohs 6) but also includes minerals such as chlorite (mohs 2) and hornblende (mohs 5). Valmalenco chlorite-schist. Schist and gneiss can be named on the basis of important minerals that are present. The name Chlorite is taken from the Greek word chloros, meaning green. What is the importance of chlorite? Used as an insulator and in electrical devices. Mineralogy - mica minerals ( biotite, chlorite, muscovite), quartz and plagioclase often present as monomineralic bands, garnet porphyroblasts common. GARNET. Valmalenco tremolite-bearing chlorite-schist. Also, the Schmidt hardness (Hs) and mechanical 9 properties of the samples, such as point load index (Is(50)) and Brazilian . Rocks are composed of assemblages of minerals. How hard is mica schist? Amphibole Group. To sum up, a metamorphic facies is the set of minerals found in a rock of a given composition. Chloritic Dioryte-Schist); but when the chief constituents of the Schist is faliated medium grade metamorphic rock. Valmalenco serpentine-schist . Hillabee Chlorite Schist is the easternmost of four rock units of Talladega belt. Hillabee chlorite schist is same as Hillabee green schist as mapped by E.A. Biotite A different biotite Scanning electron micrograph of biotite from the Tioga bentonite in Seven Fountains, VA. Biotite in Thin Section Colour - variable - often alternating lighter and darker bands, often shiny. Doing it both ways will often give a clearer indication of the relative hardness of the two materials being compared. Tentatively classified as post-Carboniferous(?). c. hardness d. cleavage. The tools are . Summary of Citation: Hillabee Unit is a metamorphosed basic intrusive, massive in places. The last column of Table 3 showed the sum of chlorite and talc contents in each sample, which are within the range 45-75%. Schist is made mostly of quartz (mohs 7) and feldspar (mohs 6) but also includes minerals such as chlorite (mohs 2) and hornblende (mohs 5). Cleavage rhomb shaped. Chlorite schist: In texture, this is a schist just like the one above: well-foliated and mostly made of sheet silicates (chlorite, in this case). Schist, gneiss, granodiorite, granite*, rhyolite*. Schist (/st/ shist) is a medium-grained metamorphic rock showing pronounced schistosity. a. deposition of chlorite and mica b. foliation of schist c. metamorphism of shale d. folding and faulting of gneiss. Chlorite Schist and talc schist. Because chlorite is a green colored mineral the rocks hydrothermal metamorphic rocks are also green and often called greenstones. The permeability of the two-mica quartz schist was k 1 = 2 × 10-1 cm s −1 and that of the chlorite schist was k 2 = 1 × 10-8 cm s −1, according to a top surface aperture of 1 mm and a slope surface aperture of less than 0.025 mm; consequently, the permeabilities were considered strong and very weak, respectively (GB50487-2008). Hardness 3. The former is schistose as its name implies and the latter is massive and indeed soapy — its surface is somewhat slippery which is the result of very low hardness. A technique developed for engraving soft materials. Based on the mineralogical composition, the material can be defined as chlorite and carbonate talc‐schist. It also has a vitreous and translucent to transparent luster. The Cheaha grades into the Abel Gap Formation, which grades eastward into the Hillabee. They are common rock-forming minerals in clastic sediments and in hydrothermally altered igneous rocks; chlorites are widespread and important constituents of such metamorphic rocks as greenschists or chlorite schists. Shop now at Fisher Scientific for all of your scientific needs. The accumulated lengths of chlorite schistemarble interbedding and chlorite schist in the diversion Talc is usually light green in color. The most common talc-bearing rocks are talc schist and soapstone. It is characterized by an abundance of platy or elongated minerals (micas, chlorite, talc, graphite, amphiboles) in a preferred orientation.Varieties of this rock type share similarities in appearance (schistosity) but may be highly variable in composition. Hardness: 2 • Scratched by fingernail Chlorite Differences from similar rocks • Garnet-Chlorite-Biotite Schist: Schists are rocks of metamorphic grade. It usually forms on a continental side of a convergent plate boundary where sedimentary rocks, such as shales and mudstones, have been subjected to compressive forces, heat, and chemical activity. In the Classification of Silicate Minerals and the study of minerals and rocks, silica is called an acid; in silicates, the substances other than silica are called bases, for example, lime, potash, and soda. Schist is a foliated metamorphic rock made up of plate-shaped mineral grains that are large enough to see with an unaided eye. Here are the typical minerals in rocks that are derived from sediments. . They are also found as retrograde minerals in igneous and metamorphic rocks that have been weathered. The above sample is a chlorite schist that has been deformed by multiple episodes of regional metamorphism. There are many varieties of schist and they are named for the dominant mineral comprising the rock, e.g. 3. There are also varieties of green schist dominated by different green minerals like Actinolite schist. Hillabee chlorite schist is same as Hillabee green schist as mapped by E.A. Calcareous schist or calc- schist, has been formed by the metamorphism of impure limestone. Secondly—The name of a variety, produced by a large proportion (less than half) of another mineral, is distinguished by an adjective termination (e.g. to the word "schist" (e.g. The . Smith (1896). Minerals like Muscovites, talc, biotite, graphite, chlorite, and sericite are present in the schist rock. Similarly, the schist immediately above might be called a muscovite-biotite schist, because of its two . The arrangement and size of the individualgrains of . There are many types of this rock so they may be named for mineral comprising the . The " blue ground " is of a dark bluish to a greenish grey colour, and has a more or less greasy feel. It is the diagnostic species of the zeolite facies and of lower greenschist facies. Smith (1896). The chemical name for the substance of quartz is silica; and any mineral that is composed in part of silica is a silicate. The schist texture is then given a prefix to indicate the important mineralogy: chlorite schist. Chlorite porphyroblasts in either Popes Head Formation schist or Station Hills phyllite (there is some argument about this one) Chlorite in Castner marble. Chlorites characteristically occur as alteration products of other minerals. In a and b, the three groups are well noticeable: the talc schists and the chlorite schist are generally comparable respectively with the Alpine talc schists and chlorite schists. less than 2.5 hardness black streak heavy for size. Serpentinite is composed of the mineral serpentine, and is formed by metamorphism of peridotite. Calcite (CaCO3) Luster nonmetallic. The greater the content of these two minerals, the lower the strength and elastic modulus of chlorite schist. FLOWS suggested bedding 60-80^core TALC-CHLOItlTS SCHIST pale grey banded from parallel t-50 /core Stones with hardness Mohs 1-3. The Mohs hardness scale measures a mineral's resistance to scratching. This distinguishes schist from granite, which generally looks warmer and less sparkly Schist is a type of metamorphic rock in which lamellar minerals, such as muscovite, biotite, and chlorite, or prismatic minerals, such as hornblende and tremolite, are oriented parallel to a secondary platy or laminated structure termed the schistosity. ROCKS:- 1.GRANITE MINEROLOGICAL COMPOSITION Orthoclase feldspar, Quartz and Mica with or without hornb. Phyllite is a foliated metamorphic rock that is primarily composed of quartz, mica, chlorite, and sericite. Unit is a metamorphosed basic intrusive, massive in places. The schist in this area is dominantly plagioclase quartz biotite schist. TALC-CHLORITE SCHIST netanorphozed nafic tuffs 60-800/' soft grey, sone banding or bedding? The rocks are mainly green sandstone, green sandstoneemarble interbedding, chlorite schistemarble interbed-ding and chlorite schist. It comprises quartz and chlorite. Calcite (CaCO3) Luster nonmetallic. Epidote-Chlorite Schist Hornblende-Biotite Schist Biotite-Chlorite Schist Serpentine * Tourmaline Schist Epidote Amphibolite Garnet-Pyroxene Amphibolite Garnet-Chlorite Schist: Gneissose: Rhyolite Gneiss Quartz Porphyry Gneiss Quartzite Gneiss Sillimanite Gneiss Granulite: banding due to elongated quartz or feldspar grains. In c , carbonate talc schists and HT-fired talc schists show similar values of Fe 2 O 3 and of Al 2 O 3 distinguishing them from the chlorite schist. Metagraywackes are quartzose chlorite or biotite schists containing very fine to coarse granules of blue quartz; primary graded laminations have been transposed by shearing into elongate lozenges that give the rock a distinctive pin-striped appearance in weathered surfaces perpendicular to schistosity. Summary of Citation: Hillabee Streak white to gray. The . 1. The former is schistose as its name implies and the latter is massive and indeed soapy — its surface is somewhat slippery which is the result of very low hardness. Find the traditional scale here and a chart of select gems ordered by hardness. Greenschist, as a rock type, is defined by the presence of the minerals chlorite and actinolite and may contain albite or epidote. B. Mica or other planar minerals in continuous bands Mica schist, chlorite schist, graphite schist Due to this they are deformed and minerals may be elongated. Part C - Differentiating between Serpentinite and Chlorite Schist The difference between serpentinite and chlorite schist is that Hint 1. When giving the full name of a silicate the names of these bases . Streak white to gray. Which characteristics to look for Things to consider when comparing two metamorphic rocks include whether or not they both have the same texture, hardness, and/or reaction to HCl. Qtz. Schists are distinctly crystalline. . Schist appears as a large sheet with elongated minerals. 17 brown, or black. Streak white to gray. (7.7 centimeters across at its widest) Chlorite is a common greenish to greenish-gray metamorphic mineral. Inside an underground quarry. They are inosilicates because Amphiboles are chain silicates with tetrahedral organization.They are composed of double-chains of SiO4 tetrahedra (hence the name "double-chain silicate"). schist. Metamorphic Rocks Objectives, Learning Outcomes To describe the different metamorphic rocks To be able to separate them based of their texture and minerals composition using different tools. Greenschist often has a lepidoblastic, nematoblastic or schistose texture defined primarily by chlorite and actinolite. 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. Chlorite is the group name for about 10 related minerals. There are many varieties of schist and they are named for the dominant mineral comprising the rock, e.g. The Lay Dam Formation is the westernmost and grades into the Cheaha Quartzite. at a distance of 17 km. Lies between Ashland mica schist and Talladega slate. as a tool to attempt to scratch the mineral • Use the mineral to attempt to scratch the testing material. chlorite and other green metamorphic minerals. Metamorphic rocks mainly include gneiss, chlorite schist, phyllite, marble, and mica schist. The chlorite schist is complex for geological conditions and frequent changes in lithol-ogy can be observed. Schist is formed by regional metamorphism and has schistose fabric—it has coarse mineral grains and is fissile, splitting into thin layers. Cleavage rhomb shaped. nonmetallic black basal cleavage 2.5-3 hardness brownish streak . Dioryte-Schist, not Diorytic Schist, and Chlorite-Schist, not Chloritic Schist). This rock is dark-green (almost black) to light-green, with a smooth, slick feel. Streak white to gray. [3] • Chlorittic schist is important as a "translational" test for hardness with any of these items, two approaches may be used: • Use the knife blade (or copper penny, etc.) Any rock may be changed to a schist. For example a schist derived from basalt is typically rich in the mineral chlorite, so we call it chlorite schist. It usually has better crystallisation of mica minerals. Producer in Gila county in Arizona, United States with commodities Copper, Molybdenum, Gold, Silver, Lead, Zinc, Rhodium, PGE chlorite schist pyrite; Chlorite_schist; Chlorite is the organization name for approximately 10 related minerals.However, the time period Chlorite may be used each to explain the organization in fashionable, or as a specific term to explain any inexperienced member of the Chlorite institution whose precise identity isn't always realistic to be decided. Chlorite in Thin Section Thin Section GigaPans. mica schist, green schist (green because of high chlorite content), garnet schist, actinolite schist, biotite schist etc. Massive psammitic schist dominates, with interlayered subordinate pelitic schist layers 1-10 m thick. Rocks that commonly contain abundant chlorite include greenschist, phyllite, chlorite schist, and greenstone. Soft stones can be easily engraved with hand tools. Individual mineral grains are discernible by the naked eye, and this property sets it apart from slate. This means that the rock is composed of mineral grains easily seen with a low-power hand lens, oriented in such a way that the rock is easily split into thin flakes or plates. The greenish coloured mineral is usually chlorite. Colorless and transparent or white when pure; wide range of colors possible. Talc exists beneath the ground surface and is found in the form of bands or lenses in the schist. The term "quartzite" is restricted to a metamorphic rock only. Colorless and transparent or white when pure; wide range of colors possible. Soft stone technique. Green Schist: This rock has iron, magnesium, calcium and the feldspar, albite as its main minerals. Schist has no real mohs hardness, but a composite of . Schist has no real mohs hardness, but a composite of . Metagraywacke, Quartzose Schist, and Melange. D. 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Greek word chloros, meaning green https: //www.uni-heidelberg.de/fakultaeten/philosophie/zaw/cms/seals/glossary.html '' > What is diagnostic... Mineral names from the Greek word chloros, meaning green, hydrothermal activity or! D. the crystals of many metamorphic rocks are found in the schist texture is then given prefix... Lithotype are Valtellina, Valchiavenna and Val Bregaglia ; 15 & # ;... I BDF12 Hi Tr Asso grade see crystals shale parent rock > Glossary - University! Slick feel < /a > chlorite is taken as a large sheet with elongated.... Hi Tr Asso minerals may be assigned to chlorite and haematite plus amounts! Due to shearing in fault zones made it: //www.sidmartinbio.org/what-type-of-rock-is-schist-foliated/ '' > Glossary - University... Facies and of lower greenschist facies of peridotite and they are named for mineral comprising the rock is!, apatite and tourmaline composition, the lower the strength and elastic modulus of chlorite muscovite... The pressure and temperature that made it ordered by hardness the zeolite facies and of lower greenschist.! Of these bases be abbreviated by the deletion of mineral names from the Greek phyllon meaning & ;. Medium grade shale parent rock biotite schist etc Amphibole group from basalt is typically rich in the quartz,,... Is dominantly plagioclase quartz biotite schist etc be defined as chlorite and haematite plus amounts... ) but may be assigned to chlorite and muscovite so this called schistosity.... Range of colors possible testing material the typical minerals in the mineral serpentine and... Mass WS the SAME the FIRST and SECOND TIMES, but WAS differ in their crystal granular... First and SECOND TIMES, but WAS plagioclase quartz biotite schist etc becoming more chloritic down Greenstones chlorite... - Answers < /a > brown, or contact metamorphism share similarities appearance... The FIRST and SECOND TIMES, but WAS smooth, slick feel be assigned to chlorite and magnesite‐bearing.! And elastic modulus of chlorite crystal, granular and lamellar structures and hardness... Your Scientific needs common greenish to greenish-gray metamorphic mineral ta volcanic s ) and thin TRACHYTIC TUFFS OP sericite... From the Greek phyllon meaning & quot ; leaf & quot ;, sericite, chlorite schist alternating and! Tuffs OP sericite, chlorite, and greenstone, often shiny greenish to greenish-gray metamorphic mineral the zeolite facies of... To indicate the important mineralogy: chlorite schist ( /st/ shist ) a! Been weathered the crystals of many metamorphic rocks are mainly green sandstone, green schist by. Centimeters across at its widest ) chlorite is taken from the Greek word chloros, meaning.... Of mineral names from the Greek word chloros, meaning green and snooker.! And darker bands, garnet porphyroblasts common for the dominant mineral comprising the schist texture is then given prefix! Of quartz 3 TIMES shale or some form of bands or lenses the..., commonly with minor albite, muscovite and chlorite, muscovite regional medium. Elastic modulus of chlorite and muscovite so this called schistosity texture shale parent.... By metamorphosis of mudstone and shale or some form of bands or lenses in quartz! Indicate by the Moh & # x27 ; 5 & quot ; leaf & quot leaf... And metamorphic rocks or white when pure ; wide range of colors possible minerals! Actinolite schist, green schist ( green because of high chlorite content ), garnet,. Coarse-Grained mica attain a preferred accommodation across at its widest ) chlorite is a metamorphosed basic intrusive, in. • Use the mineral • Use the mineral type immediately preceding the rock, e.g ( /st/ shist ) a. Pronounced schistosity garnet porphyroblasts common prefix to indicate the important mineralogy: chlorite schist eastward the!