Formula : (MgAl2[OH/PO4]2
System: monoclinic Hardness:5½-6 Rarity:not common
Strunz id:VII/B.8-20 -
PHOSPHATES, ARSENATES and VANADATES
Name origin: Named in 1795 by Martin H. Klaproth from the Arabic word meaning "heaven," in allusion to its colour.
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