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glaucophane

American  
[glaw-kuh-feyn] / ˈglɔ kəˌfeɪn /

noun

  1. a sodium-rich monoclinic mineral of the amphibole family, usually metamorphic.

glaucophane Scientific  
/ glou′kə-fān′ /

  1. 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: Na 2 (Mg,Fe) 3 Al 2 Si 8 O 22 (OH) 2 .

Etymology

Origin of glaucophane

First recorded in 1840–50; glauco- + -phane ( def. )

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The blue colour of rock is due to the presence of the amphibole mineral glaucophane.

From Textbooks • Jan. 1, 2015

Other minerals which have been found in eclogites are bronzite, olivine and glaucophane.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" by Various

These home-kept old boots were lovely in their way, hoary with mould running into the most exquisite tints of glaucophane and blue-grey, but it was a different way altogether from that of the wild boot.

From Certain Personal Matters by Wells, H. G. (Herbert George)

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.