glaucophane

[ glaw-kuh-feyn ]
/ ˈglɔ kəˌfeɪn /

noun

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

Origin of glaucophane

First recorded in 1840–50; glauco- + -phane

Example sentences from the Web for glaucophane

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.