Montgomeryite

phosphate

englishite

Formula: Ca4MgAl4(PO4)6(OH)4.12H2O hydrated phosphate with hydroxyl, montgomeryite group
Specific gravity: 2.530
Hardness: 4
Streak: White
Colour: Dark green to light green, colourless, red, yellow
Environments:

Pegmatites
Hydrothermal environments

Montgomeryite is a secondary mineral in sedimentary phosphate nodules and a late-stage mineral in highly oxidized phosphate nodules in granitic pegmatites. At the Little Green Monster Mine, Utah, USA, it occurs associated with wardite, englishite, gordonite, crandallite and apatite.

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