Formula: AlVO4.3H2O
Origin of name: for George Steiger (1869-1944, Chief chemist, U.S. Geological Survey
Crystal system: Monoclinic
Crystal class: 2 or 2/m
Twinning:
Unit cell: a = 11.84, b = 25, c = 11.04, β = 110.16°
Colour: Canary-yellow
Diaphaneity:
Luster: Waxy
Habit: Poorly developed laths and plates to 1 micron, in aggregates, pulverulent, powdery, gum-like to compact massive
Hardness: 2.5 to 3
Specific gravity: 2.55
Cleavage: 2; {010} perfect, {100} fair
Tenacity: Pulverulent
Streak: Yellow
Synonyms/varieties:
Comments: Fluorescent
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