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blue schist

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noun

a metamorphic rock formed under conditions of high pressure and relatively low temperature

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Scientific definitions for blue schist

blueschist
[ blōōshĭst′ ]

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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