Formula :
Ca4MgAl4[(OH)2/(PO4)3]2 * 12 H2O
System: monoclinic Hardness:4 Rarity:rare
Strunz id:VII/D.31-10 -
PHOSPHATES, ARSENATES and VANADATES
Name origin: After Arthur Montgomery (1909-1999), American Mineralogist, Professor of Geology, Lafayette College, Easton, Pennsylvania, USA, who collected the first specimens.
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