blue schist
noun
a metamorphic rock formed under conditions of high pressure and relatively low temperature
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Scientific definitions for blueschist
blueschist
[ blōō′shĭst′ ]
A bluish schist that gets its color from the presence of a sodic amphibolite, glaucophane, or a variety of glaucophane called crossite. Blueschist forms under conditions of high pressure but low temperature, as at the boundaries of converging tectonic plates.
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