Formula: Pb16(AsO4)4Cl14(OH)6
Origin of name: For M. Georgiades, mine director at Laurium, Greece
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: On {100} or {-104} lamellar
Unit cell: a = 13.80 Ǻ, b = 7.91 Ǻ, c = 10.81 Ǻ, β = 102.7°
Colour: White, brownish yellow
Diaphaneity:
Luster: Resinous
Habit: Tablets, stubby pseudohexagonal, with platy structure
Hardness: 3.5
Specific gravity: 6.3
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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