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  2. Metamorphism - Wikipedia

    en.wikipedia.org/wiki/Metamorphism

    [33] [34] Subsequent erosion of the mountains exposes the roots of the orogenic belt as extensive outcrops of metamorphic rock, [35] characteristic of mountain chains. [33] Metamorphic rock formed in these settings tends to shown well-developed foliation. [33] Foliation develops when a rock is being shortened along one axis during metamorphism.

  3. Schist - Wikipedia

    en.wikipedia.org/wiki/Schist

    Geologists define schist as medium-grained metamorphic rock that shows well-developed 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 millimeters (0.2 to 0.4 in) thick.

  4. Metamorphic rock - Wikipedia

    en.wikipedia.org/wiki/Metamorphic_rock

    Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock ( protolith ) is subjected to temperatures greater than 150 to 200 °C (300 to 400 °F) and, often, elevated pressure of 100 megapascals (1,000 bar ) or more, causing profound physical or chemical changes.

  5. Gneiss - Wikipedia

    en.wikipedia.org/wiki/Gneiss

    Gneiss (/ n aɪ s / nice) is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. This rock is formed under pressures ranging from 2 to 15 kbar, sometimes even more, and temperatures over 300 °C (572 °F).

  6. Hornfels - Wikipedia

    en.wikipedia.org/wiki/Hornfels

    A sample of banded hornfels, formed by contact metamorphism of sandstones and shales by a granite intrusion. Hornfels is the group name for a set of contact metamorphic rocks that have been baked and hardened by the heat of intrusive igneous masses and have been rendered massive, hard, splintery, and in some cases exceedingly tough and durable. [1]

  7. Serpentinite - Wikipedia

    en.wikipedia.org/wiki/Serpentinite

    Serpentinite is a metamorphic rock composed predominantly of serpentine group minerals formed by serpentinization of mafic or ultramafic rocks. The ancient origin of the name is uncertain; it may be from the similarity of its texture or color to snake skin. [1] Greek pharmacologist Dioscorides (AD 50) recommended eating this rock to prevent ...

  8. Kinetic energy metamorphosis - Wikipedia

    en.wikipedia.org/wiki/Kinetic_energy_metamorphosis

    The products of KEM were first identified in 2015 in cupules, a form of rock art consisting of spherical cap or dome-shaped depressions created by percussion with hammer-stones. KEM laminae, caused by solid state re-metamorphosis of metamorphic rock , have been observed in cupules on three rock types:

  9. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Mylonite – Metamorphic rock – A metamorphic rock formed by shearing; Metaconglomerate - A type of metamorphic rock formed through the recrystallization of conglomerates; Metapelite – Metamorphic rock – A metamorphic rock with a protolith of clay-rich (siltstone) sedimentary rock