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glaucophane

[ glaw-kuh-feyn ]
/ ˈglɔ kəˌfeɪn /
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noun
a sodium-rich monoclinic mineral of the amphibole family, usually metamorphic.
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Origin of glaucophane

First recorded in 1840–50; glauco- + -phane
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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Scientific definitions for glaucophane

glaucophane
[ gloukə-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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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