Formula: Zn2(AsO4)(OH) . H2O
Origin of name: For Mr. LeGrand, Belgian mine engineer
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 12.80 Ǻ, b = 7.94 Ǻ, c = 10.22 Ǻ, β = 104.2°
Colour: Colourless to wax-yellow
Diaphaneity:
Luster: Vitreous
Habit: Crystals long prismatic, often in aggregates of sprays or fans
Hardness: 4.5
Specific gravity: 3.98
Cleavage: 1; {100} fair to poor
Tenacity: Uneven; brittle
Streak:
Synonyms/varieties:
Comments:
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