blueschist

Scientific  

/ blo̅o̅′shĭst′ /

1. 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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Example Sentences

As evidence of the youthfulness of the plate regimen, Dr. Stern points to two classes of rocks: ophiolites and blueschist.

From New York Times

“Revised ages of blueschist metamorphism and the youngest pre-thrusting rocks in the San Juan Islands, Washington.”

From Scientific American