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glaucophane

[glaw-kuh-feyn] /ˈglɔ kəˌfeɪn/
noun
1.
a sodium-rich monoclinic mineral of the amphibole family, usually metamorphic.
Origin of glaucophane
1840-1850
1840-50; glauco- + -phane
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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glaucophane in Science
glaucophane
  (glou'kə-fān')   
A blue to grayish-blue or bluish-black monoclinic mineral of the amphibole group. Glaucophane occurs as fibrous prisms in schists (especially blueschists) formed by the regional metamorphism of sodium-rich rocks. Chemical formula: Na2(Mg,Fe)3Al2Si8O22(OH)2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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