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  2. Greenschist - Wikipedia

    en.wikipedia.org/wiki/Greenschist

    Greenschist is defined by the presence of the minerals chlorite, epidote, or actinolite, which give the rock its green color. Greenschists also have pronounced schistosity . [ 3 ] Schistosity is a thin layering of the rock produced by metamorphism (a foliation ) that permits the rock to easily be split into flakes or slabs less than 5 to 10 ...

  3. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Cataclasite – Rock found at geological faults – A rock formed by faulting; Eclogite – Metamorphic rock formed under high pressure; Gneiss – Common high-grade metamorphic rock; Granulite – Class of high-grade medium to coarse grained metamorphic rocks; Greenschist – Metamorphic rock – A mafic metamorphic rock dominated by green ...

  4. Greenstone belt - Wikipedia

    en.wikipedia.org/wiki/Greenstone_belt

    Elmers Rock greenstone belt (Wyoming, USA) Flin Flon greenstone belt (Manitoba/Saskatchewan, Canada) Hope Bay greenstone belt (in the western portion of Kivalliq Region, Nunavut, Canada) Hunt River greenstone belt (Newfoundland and Labrador, Canada) Isua greenstone belt (Southwestern Greenland) Nuvvuagittuq greenstone belt (Quebec, Canada)

  5. Prasiolite - Wikipedia

    en.wikipedia.org/wiki/Prasiolite

    Prasiolite (also known as green quartz, green amethyst or vermarine) is a green variety of quartz. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, [citation needed] but it has also been mined in the Lower Silesia region of Poland. Naturally occurring prasiolite has also been found in the Thunder Bay area of ...

  6. Sedimentary rock - Wikipedia

    en.wikipedia.org/wiki/Sedimentary_rock

    Uluru (Ayers Rock) is a large sandstone formation in Northern Territory, Australia.. Sedimentary rocks can be subdivided into four groups based on the processes responsible for their formation: clastic sedimentary rocks, biochemical (biogenic) sedimentary rocks, chemical sedimentary rocks, and a fourth category for "other" sedimentary rocks formed by impacts, volcanism, and other minor processes.

  7. Pegmatite - Wikipedia

    en.wikipedia.org/wiki/Pegmatite

    The aplites are often layered, showing evidence of deformation. [19] Xenoliths may be found in the body of the pegmatite, but their original mineral content is replaced by quartz and alkali feldspar, so that they are difficult to distinguish from the surrounding pegmatite. Pegmatite also commonly replaces part of the surrounding country rock. [19]

  8. Schist - Wikipedia

    en.wikipedia.org/wiki/Schist

    Schistosity is a thin layering of the rock produced by metamorphism (a foliation) that permits the rock to easily be split into flakes or slabs less than 5 to 10 millimeters (0.2 to 0.4 in) thick. [ 4 ] [ 5 ] The mineral grains in a schist are typically from 0.25 to 2 millimeters (0.01 to 0.08 in) in size [ 6 ] and so are easily seen with a 10 ...

  9. Peridotite - Wikipedia

    en.wikipedia.org/wiki/Peridotite

    It is interpreted as depleted mantle rock, from which basaltic magma has been extracted. It also forms as a cumulate in Type I layered intrusions, forming a layer just above the dunite layer. [11] Harzburgite likely makes up most of the mantle lithosphere underneath continental cratons. [12] Wehrlite: less than 5% orthopyroxene

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