blueschist

noun blue·schist \ ˈblü-ˌshist \

Definition of blueschist

plural blueschists
geology : a metamorphic rock that is formed under high pressure and low temperature and is characterized by the presence of glaucophane
  • Also radiometric ages of blueschists from the same regions cluster around 400-500 Myr.
  • —T. Nakajima et al.Nature19 July 1990
  • At this depth, where the pressure is 15 to 20 kilobars and temperatures reach about 500 degrees C, rocks called blueschists and eclogites form.
  • —Ian AndersonNew Scientist29 Mar. 1997

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First Known Use of blueschist

1789


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