glaucophane

A monoclinic mineral, 2[Na2 (Mg,Fe)3 Al2 Si8 O 22 (OH)2 ] ; amphibole group with Mg/(Mg+Fe) = 0.5 to 1.0; prismatic cleavage; bluish-gray to lavender blue; common in low-temperature, high-pressure schists associated with lawsonite, pumpellyite, or epidote. CF: crossite; riebeckite.
Source: Dictionary of Mining, Mineral, and Related Terms











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