Formula: SrAl3(PO4)(PO3OH)(OH)6
Origin of name: After locality; Gois (Goyaz), Brazil
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 7.02 Ǻ, c = 16.60 Ǻ
Colour: Colourless, yellowish, pink
Diaphaneity:
Luster: Resinous to greasy, pearly on base
Habit: Crystals rhombohedral, pseudocubic, or tabular, small; rounded grains or pebbles
Hardness: 4.5 to 5
Specific gravity: 3.22
Cleavage: 1; {0001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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