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Webster 1913 Edition

Noun.

[Gr.

γλαυκόσ

silvery, gray +

φαίνεσθαι

to appear.]

(Min.)

A mineral of a dark bluish color, related to amphibole. It is characteristic of certain crystalline rocks.

Glaucophane

glaucophane ‎(plural glaucophanes)

(mineralogy) A mixed aluminate of sodium, magnesium and aluminium that has a characteristic blue colour, and exhibits pleochroism, with the chemical formula Na₂(Mg,Fe²⁺)₃Al₂Si₈O₂₂(OH)₂.