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Blueschist
Type of metavolcanic rock / From Wikipedia, the free encyclopedia
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Blueschist ( /ˈbluːʃɪst/), also called glaucophane schist, is a metavolcanic rock[1] that forms by the metamorphism of basalt and rocks with similar composition at high pressures and low temperatures (200–500 °C (392–932 °F)), approximately corresponding to a depth of 15–30 km (9.3–18.6 mi). The blue color of the rock comes from the presence of the predominant minerals glaucophane and lawsonite.
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Blueschists are schists typically found within orogenic belts as terranes of lithology in faulted contact with greenschist or rarely eclogite facies rocks.