Formula: (Pb,Sr)Al3(PO4)(SO4)(OH)6
Origin of name: Locality; Hinsdale Co., Colorado
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 6.97 Ǻ, c = 16.8 Ǻ
Colour: Nearly colourless, with yellowish or greenish tint
Diaphaneity:
Luster: Vitreous
Habit: Crystals pseudocubic, rhombohedral, or tabular; massive, granular
Hardness: 4.5
Specific gravity: 3.65
Cleavage: 1; {0001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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