Formula: Ca4MgAl4(PO4)6(OH)4 . 12H2O
Origin of name: For A. Montgomery, American geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 10.02 Å, b = 24.12 Å, c = 6.24 Å, β = 91.6°
Colour: Deep green, yellowish, pink, red, pale green to white to colourless
Diaphaneity:
Luster: Vitreous
Habit: Crystals lath-like, to 3 mm, in subparallel groups; massive, aggregates of subparallel plates
Hardness: 4
Specific gravity: 2.46 to 2.53
Cleavage: 2; {010} perfect, {100} poor
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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