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Schist (/ ˈ ʃ ɪ s t / SHIST) is a medium-grained metamorphic rock showing pronounced schistosity (named for the rock). 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.
Chlorite schist, a type of greenschist Greenschist (prasinite) at Cap Corse in Corsica, France Greenschist (epidote) from Itogon, Benguet, Philippines. Greenschists are metamorphic rocks that formed under the lowest temperatures and pressures usually produced by regional metamorphism, typically 300–450 °C (570–840 °F) and 2–10 kilobars (29,000–145,000 psi). [1]
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The following is a list of rock types recognized by geologists.There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type.
Folk's carbonate rock classification details the relative proportions of allochems in the rock and the type of matrix. The classification scheme covers most common carbonate rocks , however the more inclusive although less precise alternative, Dunham classification , may be preferred in some instances.
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This category contains the geologic formations with a schist lithology. Pages in category "Schist formations" The following 11 pages are in this category, out of 11 total.
As the rock undergoes higher temperatures and pressures, it follows the classic Barrovian sequence from the chlorite zone to the biotite zone to the garnet zone to the staurolite zone. For a metapelitic rock containing chlorite , kaolinite , and quartz the petrogenetic grid for metapelites (Figure 1) shows that such a rock can only form at ...