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[glaw-kuh-feyn] /ˈglɔ kəˌfeɪn/

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


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