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(mineralogy) A blue amphibole mineral, a mixed aluminate of sodium, magnesium and aluminium that exhibits pleochroism, with the chemical formula Na₂(Mg,Fe²⁺)₃Al₂Si₈O₂₂(OH)₂.
Glaucophane with fuchsite (white oval)
Folded Glaucophane Blueschist, Syros, Greece