Metamorphism
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Metamorphism is the transformation of existing rock to rock with a different mineral composition or texture. Metamorphism usually takes place at temperatures in excess of 150 °C, and often also at ele
A cross-polarized thin section image of a garnet-mica-schist from Salangen Municipality, Norway showing the strong strain fabric of schists. The black crystal is garnet, the pink-orange-yellow colored strands are muscovite mica, and the brown crystals are biotite mica. The grey and white crystals are quartz and (limited) feldspar.
Amphibolite formed by metamorphism of basalt showing coarse texture
A mylonite (through a petrographic microscope)
A metamorphic rock, deformed during the Variscan orogeny, at Vall de Cardós, Lérida, Spain
Metamorphic rock
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Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock is subjected to temperatures greater than 150 to 200 °C and, o
Metamorphism
…transformed physically or chemically at elevated temperature, without actually melting to any great degree. The importance of heating in the formation of metamorphic rock was first recognized by the pioneering Scottish naturalist, James Hutton, who is often described as the father of modern geology. Hutton wrote in 1795…
Quartzite, a type of metamorphic rock
Metamorphic rock containing staurolite and almandine garnet