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staurolite schist parent rock

Width of sample 19 cm. These are the constituents of eclogite which is a closely related rock type. Individual mineral grains are discernible by the naked eye. Talc is a very soft mineral which makes it possible to cut this rock with a knife. These changes record geologic processes and events of the past. Phyllite 7. Metamorphic rock - Metamorphic rock - Metamorphic reactions: A very simple mineralogical system and its response to changing pressure and temperature provide a good illustration of what occurs in metamorphism. Major Concepts. Both schist and gneiss are made of shale, but they are quite different rocks. Tohmajärvi, Finland. They discussed two possible hypotheses-syngenetic or metasomatic-for the origin of the bands. The staurolite crystals that are found here were formed about 1800 million years ago by the heat and pressure of a regional metamorphic, mountan-building event called the Penokean Orogeny. This paper discusses additional evidence in support of the metasomatic hypothesis. (1810) Untersuchung des Stauroliths, Beiträge zur chemischen Kenntniss der Mineralkörper, Fünfter Band, Rottmann Berlin: 80-85. It is made up of clay minerals. Greenschist facies, one of the major divisions of the mineral facies classification of metamorphic rocks, the rocks of which formed under the lowest temperature and pressure conditions usually produced by regional metamorphism.Temperatures between 300 and 450 °C (570 and 840 °F) and pressures of 1 to 4 kilobars are typical. Chlorite schist (greenschist) is a metamorphosed mafic igneous rock. Quartzofeldspathic (gneissic) schist. Garnet hornblende schist from Switzerland. Mica schist is a very common variety. These cookies do not store any personal information. K Kyanite-Garnet-Mica Schist. Graphite schist. Width of specimen 27 cm. Common minerals in schistose rocks indicate that these rocks formed at low- to intermediate grade conditions (subgreenschist, greenschist, blueschist, and amphibolite facies). A Amphibolite. Width of sample 6 cm. The name of a particular schistose rock depends on the dominant minerals present — muscovite-garnet-staurolite schist, for example. Biotite together with fine-grained quartz and plagioclase form the foliated matrix of the rock. It is usually envisaged that sedimentary strata over areas of hundreds of square kilometers were subjected to elevated temperatures and pressures due to deep burial and deformation/tectonic forces over millions of years. Metamorphic rock. We also use third-party cookies that help us analyze and understand how you use this website. The name of a particular schistose rock depends on the dominant minerals present muscovite-garnet-staurolite schist, for example. Metamorphic rocks form from pre-existing rocks ("parent rocks") due to changes in either temperature, pressure, or volatiles within the earth, often by a combination of all three. This relatively fine-grained schist is packed with a variety of minerals. Schists have mineral crystals large enough to be identified and usually have wavy, undulating foliation textures caused by micas and other platy minerals. Metamorphic Rock Index. Schist is one of the most widespread rock types in the continental crust. The latter contains bluish amphibole glaucophane. The minerals that develop in a metamorphic rock … Schist may be worth mining if it contains useful minerals in large concentration. A. Metamorphic rocks are the rocks made through the process of heat and pressure added onto a parent rock. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Metamorphic rocks are classified basesd on their texture and composition. Alta, Norway. S Serpentinite. It is mandatory to procure user consent prior to running these cookies on your website. Its constituent platy mineral grains are large enough to impart a silky sheen to the cleavage surfaces of the rock. Slate. Klaproth, M.H. Tohmajärvi, Finland. This means that not only composition but the formation conditions too are highly variable. 1. Probably collected by the late Dr. Helen Lang, location unknown. Fissile character gave this rock type its name — the Greek word skhistos means ‘split’, from the base of skhizein ‘cleave’. By clicking “Accept”, you consent to the use of ALL the cookies. It is nicely glittering in sunshine because mica flakes act as small mirrors. Blueschist (glaucophane schist with garnet and omphacite). You also have the option to opt-out of these cookies. M Marble. The focus of the investigation is on the reactions and mineralogical changes that accompany the step-wise transformation of one rock into the other. The temperature of the intrusive magma has little effect on the metamorphic minerals formed. Common minerals extracted from schistose metamorphic rocks are garnet, kyanite, talc and graphite. 49) Name three rocks that are produced by contact metamorphism. Razavi,* F. Masoudi, and Z. Alaminia Department of Geology, Tarbiat Moallem University, Tehran, Islamic Republic of Iran Abstract Mashhad Metamorphic Complex (MMC) with metamorphic, granitic intrusions and ophiolite units is situated in the suture zone of Paleotethys in NE Iran. A heap of quartz schist slabs demonstrating platy habit which is caused by the abundance of platy minerals. Width of the dike is approximately 15-20 cm. Most metamorphic processes take place deep underground, inside the earth’s crust. Dana, E.S. Jackson, J. Most metamorphic rocks that we observe at Earth’s surface were derived from the three most common sedimentary rocks —shale, limestone, and quartz sandstone. Width of sample 7 cm. Classification of Staurolite-mica schistHide Rock. Mica-schist is a rock composed essentially of and mica, usually either or biotite. (1997). Schist. It occurs associated with staurolite, andalusite, sillimanite, talc, hornblende, gedrite, mullite and corundum. 4. Schistosity is a type of foliation, characterised by the preferred orientation of elongated or platy mineral grains (which are abundant in schistose rocks). Metamorphic rock. Shale is the most likely parent of most slate, phyllite, schist, and gneiss. Common minerals that form porphyroblasts are garnet, staurolite, kyanite and andalusite. The mica plates all lie with their cleavage planes parallel to each other and give to the rock a striking laminated or "schistose" structure. Phyllite. The photographs here are taken from a thin section of a staurolite schist from Claggan quarry, County Galway, Republic of Ireland. Index minerals are helpful in determining isograds and metamorphic zones. 6. Among foliated metamorphic rocks, it represents a gradation in the degree of metamorphism between slate and schist. Non-platy minerals – garnet, staurolite Bladed and prismatic minerals – kyanite, sillimanite, tourmaline Typically has silky to shiny luster due to reflection from mica flakes Medium to high Schist Shale Mudstone Siltstone Mafic igneous rocks Rhyolite Arkose Coarse grained Minerals segregated into alternating light and dark layers give the rock a banded texture – Small lithic fragments of mica schist in a river sand from Canada. Riebeckite (amphibole group mineral) schist with a lineated fabric. An uncomplicated sediment at Earth’s surface, a mixture of the clay mineral kaolinite [Al4Si4O10(OH)8] and the mineral quartz (SiO2), provides a good example. Schist is a medium-grained strongly-foliated crystalline metamorphic rock, formed by dynamic metamorphism, that can be readily split into thin flakes or slabs due to the well-developed parallelism of more than 50% of the minerals present, particularly those of lamellar or elongate prismatic habit, e.g., mica and amphiboles. It seems we can’t find what you’re looking for. Slate 2. 103. Adjectives may be applied to these general rock names to indicate either major minerals present or parent material. Etsy uses cookies and similar technologies to give you a better experience, enabling things like: basic site functions; ensuring secure, safe transactions English Dictionary. Kapteeninautio, Finland. This property sets it apart from slate. False. False. Rock contains minerals depends on the chemical composition of parent rock. Above gneiss, when the rock actually starts to melt, it is called a migmatite. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Almandine garnet is also present as smaller (pink) porphyroblasts. These "parent" rocks are modified during metamorphism and the attempt to re establish equilibrium with the changed conditions creates another "daughter" rock type. This rock is quarried as a dimension stone. A graphite schist sample from Trælen, Norway. Width of sample 10 cm. G Garnet-Mica Schist. Kyanite occurs in gneiss, schist, pegmatite, and quartz veins resulting from high pressure regional metamorphism of principally pelitic rocks. Width of sample 16 cm. Also fine grained feldspar and quartz are frequently major in phyllite. Mica schist with porphyroblasts of garnet, staurolite and kyanite. Schist. These were once sandstones and arenaceous rocks. Phyllite is between them in metamorphic grade. But opting out of some of these cookies may affect your browsing experience. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental … … Metamorphic reactions between minerals upon increased burial will lead to the loss of schistosity because feldspar increases in abundance as micas become unstable. Limestone, which is composed of the mineral calcite (CaCO3), is the parent rock of marble, while quartz (SiO2) sandstone is the parent of quartzite. Schist (pron. Such rocks often contain garnet porphyroblasts (red crystals). Individual crystals in schist are clearly discernible. In pelitic (fine-grained sedimentary) rocks, the appearance of index minerals indicates the degree of alteration. This rock is mined because of its very high graphite content. Along this route the degree of metamorphism gradually increases from sedimentary parent rock, to low-grade metamorphic rock, then higher-grade metamorphic rock, and eventually the igneous core. These include greenschists and blueschists. Schist is a medium-grained strongly-foliated crystalline metamorphic rock, formed by dynamic metamorphism, that can be readily split into thin flakes or slabs due to the well-developed parallelism of more than 50% of the minerals present, particularly those of lamellar or elongate prismatic habit, e.g., mica and amphiboles. Graphite forms at the expense of organic matter in sedimentary protoliths. Schist ⓘ Staurolite-mica schist; References for StauroliteHide. Mica-schist is a rock composed essentially of and mica, usually either or biotite. From a geological sense, these rocks metamorphosed. Phyllite Chemical Composition . Width of sample 13 cm. The vast majority of staurolites are imperfect, which means the cross is not in the traditional 90 degree cross shape. Staurolite is a common mineral in medium-grade aluminous metamorphic rocks. H Hornfels. Schist has a greater degree of metamorphism than phyllite but less than gneiss. The preexisting, or parent rocks, are called protoliths. Muscovite schist, biotite schist, and chlorite schist (often called “greenstone”) are commonly used names. 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. Schist is characteristically foliated, meaning the individual mineral grains split off easily into flakes or slabs. Schist is rich in flaky and soft sheet silicate minerals which makes it structurally weaker than gneiss or granite. Some common examples include the following: biotite schist, garnet-staurolite schist, sillimanite schist, granitic gneiss, mafic gneiss, etc. A Staurolite is a rock that grows in the shape of a cross—well, grows may not be completely accurate. The rock may display compositional banding and it often contains porphyroblasts (garnets in this rock). Green mineral is omphacite, red is garnet. This process will lead to the formation of high-grade metamorphic rock gneiss (and gneissose fabric which can be described as a poorly developed schistosity). Mica Schist. Phyllite is mainly composed of fine grains of mica minerals that are muscovite, or sericite. Sedimentary rocks that were rich in organic matter metamorphose to graphitic schists. Varieties of schistose metamorphic rocks: 1. The correlation of major gold deposits with rock type, even when the gold is primarily in veins, argues for rock‐dominated depositional systems, not fluid‐dominated ones. A schistose garnet amphibolite from Norway. Andalusite (brown) porphyroblasts in a sericite schist sample. schistosity, schist Metamorphic rocks are very common in the crystalline basement rocks of the oldest parts of continents. (2007). However, some varieties have an attractive appearance which makes them useful as a facing or decorative stone. C Chlorite Schist. Most have metamorphosed into an X shape or are missing parts, and the majority are imperfect. A foliation found in metamorphic rocks with more than 50% plate and elongated minerals is known as _____, and the rock this foliation is found in is called _____. The different textures and compositions provide information about the conditions of metamorphism and the protolith (parent rock) Texture 1. foliated a.slaty cleavage: planar parallel alignment of fine-grained clay size minerals that form planes of weakness in the rock McGraw-Hill. Microscopically, schists commonly show a crenulation fabric which indicates the presence of older foliation that may represent an earlier episode of deformation4. Lineated Gneiss. Gneiss 4. These crystals formed as the metamorphism progressed and they can convert to each-other as conditions change. Andalusite (white) and staurolite (orange) form porphyroblasts up to 2 millimetres is size. An outcrop of staurolite schist. Schist (pron. These cookies will be stored in your browser only with your consent. The composition is very rich in aluminum: Fe 2 Al 9 O 6 [(Si,Al)O 4] 4 (OH) 2. Width of view 20 mm. The individual mineral grains in slate are not visible to the naked eye while they are clearly visible in schist. Lipasvaara, Finland. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA) Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. Trælen, Senja, Norway. Talc schist is a source of talc. Phyllite has fine-grained mica flakes in a preferred orientation, whereas slate has extremely fine clay flakes that achieve a preferred orientation, and schist has large flakes in a preferred orientation. Schist can form only if the compressed rock contains lots of elongated or platy grains. Mica-schist is a rock composed essentially of and mica, usually either or biotite. 3. L Layered Gneiss. Minerals that develop in a metamorphic rock depend on • grade of metamophism • composition of the parent material . May not parallel original bedding. Perhaps searching can help. Chlorite schist (greenschist). Varieties of this rock type share similarities in appearance (schistosity) but may be highly variable in composition. It is classed as a medium-grade metamorphic rock and is associated with regional metamorphism due to mountain building. Metamorphic Rocks. This sequence of metamorphic rocks reflects an increase in grain size, a change in rock texture, and a change in mineralogy. Adjectives may be applied to the general rock name to denote either major minerals or parent material: EX: biotite schist, garnet-staurolite schist, granitic gneiss, etc. A sample of muscovite-garnet-staurolite schist that contains porphyroblasts of garnet (red, equant), kyanite (blue) and staurolite (dark, elongated). Involves recrystallization in the solid state, often with little change in overall chemical composition. Amphibole-bearing rocks with a lineated fabric belong to this group. Graphite schist from the Urals, Russia. Several less known names have been given to a specific varieties: staurotile (contains staurolite porphyroblasts), prasinite (metamorphosed mafic rock with epidote, chlorite and hornblende in equal proportions), sismondinite (chloritoid is the dominant mineral phase). Schist 3. That is the reason why this rock type is used less frequently as a building stone. Phyllite is coarser and has a silky sheen on the cleavage surfaces. Note the fissile character which is evident in all scales. Phyllite is an intermediate-grade, foliated metamorphic rock type that resembles its sedimentary parent rock, shale, and its lower-grade metamorphic counterpart, slate.Like slate, phyllite can be distinguished from shale by its foliation, called slaty cleavage, and its brittleness, or fissility. Characteristically twinned staurolite porphyroblast in an Al-rich metapelite (staurolite schist or staurotile). Porphyroblasts somewhat resemble phenocrysts in igneous rocks — both are larger crystals in a fine(r) matrix but the mineralogy is distinctly different. Schistose rocks are fissile, they have a tendency to split along sub-parallel planes (sometimes described as s-surfaces). SEDIMENTARY & IGNEOUS ROCKS AND THEIR METAMORPHIC EQUIVALENTS Name Parent Rock LOW Grade chlorite blotite MEDIUM Grade garnet staurolite HIGH Grade kyanite sillimanite Quartz Arenite Quartzite Limestone Marble Shale Slate & Phylite Blotite Schist Garnet Schist Staurolite Schist Kyanite Schist Silimanite Schist Anthracite Graphite Schist Coal Clay-Rich Sandstone Conglomerate Chlorite … In fact, New Hampshire is nicknamed the Granite State. Narvik, Norway. This sample seems to be approaching the imaginary boundary between schist and gneiss. Schist is a foliated metamorphic rock made up of plate-shaped mineral grains that are large enough to see with an unaided eye. Another major part of the family are rocks with a mafic igneous protolith. Slate is a fine-grained rock with well-developed slaty cleavage. This sample formed at high pressure conditions. 2. This indicates that the protolith had to be a clay-rich sedimentary rock. Wiley-Blackwell. An amphibole group mineral glaucophane gives blue color to blueschist. Width of sample 15 cm. The mica is the prominent mineral, occurring in irregular leaves and in foliated masses. Print Metamorphic Rock flashcards and study them anytime, anywhere. Several less known names have been given to a specific varieties: staurotile (contains staurolite porphyroblasts), prasinite (metamorphosed mafic rock with epidote, chlorite and hornblende in equal proportions), sismondinite (chloritoid is the dominant mineral phase). Tonalite dike cutting through graphite-rich schistose rock. 6.2.2: Non-foliated. The metasomatic process trans-formed the primary schist into a desilicated corundum-rich residue. This is a schist consisting almost entirely of staurolite and muscovite. shist) is a medium- to coarse-grained, often shiny, mica-laden rock. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. A. Oxford University Press. The quarry is in staurolite zone Dalradian Kylemore Formation metasediments. Protolith or Parent Rock: Parent rock for phyllite is shale or pelite, or ... it represents a gradation in the degree of metamorphism between slate and schist. J. Schist stage Parent rock completely recrystallized becomes 'mica schist'. Narvik, Norway. Growth of mica crystals during the course of metamorphism makes the schistosity more evident. The rock name was introduced into the French language (schiste) in the late 18th century3. Staurolite-Garnet-Mica Schist: Texture: Foliated; Fine- to medium-grained: Composition: Muscovite, Biotite, Staurolite, Garnet, Quartz, Feldspar: Index Minerals: Staurolite and Garnet: Color: Medium silver to gray: Miscellaneous: Large dark-brown Staurolite crystals visible: Metamorphic Type: Regional: Metamorphic Grade: Middle Grade (Middle P - Middle T) Parent Rock The differentiation between schist and lower-grade metamorphic rocks slate and phyllite is also somewhat problematic. Kyanite is typically a blue aluminosilicate mineral, usually found in aluminium-rich metamorphic pegmatites and/or sedimentary rock.Kyanite in metamorphic rocks generally indicates pressures higher than four kilobars.It is commonly found in quartz. Geology for Environmental Scientists . Volatiles are those chemical substances, including water and carbon dioxide, that easily turn into gas or fluid and are mobile enough to move in and out of solid rock inside the earth. McGraw Hill Encyclopedia of Science & Technology. This website uses cookies to improve your experience while you navigate through the website. Volatiles are those chemical substances, including water and carbon dioxide, that easily turn into gas or fluid and are mobile enough to move in and out of solid rock inside the earth. July 19, 2019 admin Petrology 2. Staurolite-mica schist. It is characterized by an abundance of platy or elongated minerals (micas, chlorite, talc, graphite, amphiboles) in a preferred orientation. Q Quartzite. The minerals that develop in a metamorphic rock depend upon: 1) the grade of metamorphism 2) the composition of the parent material. Mica schist, the most common schistose rock and the second most common metamorphic rock, is composed mostly of mica (usually biotite or muscovite) and smaller amounts of quartz. Distinctively metamorphic minerals such as garnet, staurolite, kyanite, and sillimanite occur in schists, depending on the metamorphic grade and starting composition of the parent rock. The characteristic wavy or undulating rock cleavage common to schist. This category only includes cookies that ensures basic functionalities and security features of the website. Other names based upon obvious metamorphic minerals are garnet schist, kyanite schist, staurolite schist, hornblende schist, and graphite schist. The original parent rock (or protolith) of mica schist is shale. A Unique Chloritoid - Staurolite Schist from near Squaw Peak, Phoenix, Arizona by Douglas G. Thorpe1 and Donald M. Burt1 Abstract A local chloritoid-staurolite-biotite-garnet-quartz-muscovite schist horizon in the North Phoenix Mountains, Arizona, is interesting because of the large number of coexist­ ing phases. Distinctively metamorphic minerals such as garnet, staurolite, kyanite, and sillimanite occur in schists, depending on the metamorphic grade and starting composition of the parent rock. This also sets it apart from gneissose rocks that have a lineated fabric but do not possess a fissile character. Mineralogy of Staurolite-mica schistHide. The resultant mineralogical and textural transformations are said to be due to mineral reactions in the original sediments under the prevailing te… Protoliths can be igneous, sedimentary, or metamorphic rock of all sorts. Shale is the parent rock. Schist. I remember the order of the index minerals with the mnemonic "CBGSKS", which I read as "See Bigs kiss". Start studying Geology 102 - Metamorphic Rocks. Shale can metamorphose into slate, phyllite, schist or gneiss depending on the degree of heat and pressure. This force may be compressive (in mountain ranges) or simply caused by the weight of the overlying rocks. Amphibolite (/ æ m ˈ f ɪ b ə l aɪ t /) is a metamorphic rock that contains amphibole, especially hornblende and actinolite, as well as plagioclase.. Amphibolite is a grouping of rocks composed mainly of amphibole and plagioclase feldspar, with little or no quartz.It is typically dark-colored and dense, with a weakly foliated or schistose (flaky) structure. A schistose metamorphic rock containing staurolite and mica. Width of sample 14 cm. Staurolite-garnet-mica schist from South Dakota, USA. This particular specimen is a fine grained staurolite-bearing pelite (a metamorphosed clay-rich sedimentary rock). Metamorphic rocks form from pre-existing rocks ("parent rocks") due to changes in either temperature, pressure, or volatiles within the earth, often by a combination of all three. I recall that gneiss is the highest grade because it is..."nice". Quartz is a common phenocryst in igneous rocks, but it never occurs as a porphyroblast in metamorphic rocks. 4. Best, Myron G. (2002). Width of sample 14 cm. Some of the micas have already reacted to form feldspar. Medium-grade metamorphism causes recrystallization , rotation , and new growth of micas (predominantly muscovite , biotite , and chlorites ) from fine-grained, mica-bearing rocks such as shales and slates, which results in the well-developed planar to wavy foliation (schistosity) characteristic of schists. Metamorphic rocks can be formed from any rock type: igneous, sedimentary, or existing metamorphic rocks. Schist is formed from the exposure of previously existing rock to high pressures and heat from tectonic forces. During metamorphism, protolith chemistry is mildly changed by increased temperature (heat), a type of … slab of garnet – staurolite – biotite schist wedged into a body of ultramafic rock. Width of sample from Norway is 14 cm. Of the two styles of metamorphism, contact and regional, the latter is most often used to argue against the young-earth creation-Flood model. Cite this article as: Geology Science. 1. The mica is the prominent mineral, occurring in irregular leaves and in foliated masses. Slate: Slate is an extremely fine-grained metamorphic rock characterized by a slaty cleavage by virtue of which it can be readily split into thin sheets having parallel smooth surfaces. mostly of mica (usually biotite or muscovite) and smaller amounts of quartz. Shale is the most likely parent of most slate, phyllite, schist, and gneiss. The mica is the prominent mineral, occurring in irregular leaves and in foliated masses. Sometimes schist is imagined to contain at least 50% of elongated minerals1, but in many cases the distinction between these rocks is just based on the qualitative assessment of a geologist describing the rocks in the field. Depending on temperature, schist may contain index minerals. Greenstone. Because of it is strong and durable. Alta, Norway. Volume 16. Schist and gneiss are metamorphic rocks. In: McGraw Hill Encyclopedia of Science & Technology, 10th Edition. Quartz schist with perfectly parallel cleavage surfaces. Garnet-Biotite Chemistry for Thermometry of Staurolite Schist from South of Mashhad, NE Iran M.H. It is a hydrous mineral which makes it unstable at very high pressures. (Irish Grid Ref: M 011506). American Geological Institute. Metamorphic grades describe rocks on a relative scale from less altered to more altered. Mines: 5: 545. Schist is a strongly foliated medium-grade metamorphic rock. P Phyllite. Non-foliated metamorphic rocks are typically composed of just one mineral and, therefore, usually show the effects of metamorphism with recrystallization in which crystals grow together, but with no preferred direction. Sensitive clay landslide detection and characterization in and around Lakelse Lake, British Columbia, Canada, Impact of weathering on slope stability in soft rock mass, Large-scale field trial to explore landslide and pipeline interaction, Detecting natural fractures with ground penetrating radar and airborne night-thermal infrared imagery around Old Faithful Geyser, Yellowstone National Park, USA, Copyright © 2020 | WordPress Theme by MH Themes. Foliation surfaces are commonly wavy which reflects the presence and growth of porphyroblasts. Quartzite 5. Such large and often euhedral crystals are known as porphyroblasts. Width of sample 19 cm. Schistosity is a result of pressure in the crust which forces the grains to align perpendicular to the force applied. This roughly corresponds to temperatures in the range of 300-600 °C and pressures from several to several tens of kilometers. Reference List: Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A) Haüy, R.J. (1797) Staurotide. Width of view 50 cm. 12 • Form under Confining pressure conditions, or, • In rocks composed of a single mineral that are not platy or elongated Marble: Calcite or dolomite • Parent: Carbonate sed. B Blueschist. shist) is a medium- to coarse-grained, often shiny, mica-laden rock. The changes that occur during metamorphism may involve changes in rock texture, in the minerals present, and sometimes in overall rock composition. - Staurolite-garnet-muscovite-biotite schist - Download Free 3D model by WVU Volcanology … Metamorphic source rocks, the rocks that experience the metamorphism, are called the parent rock or protolith, from proto– meaning first, and lithos- meaning rock. Metamorphism occurs when solid rock changes in composition and/or texture without the mineral crystals melting, which is how igneous rock is generated.

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