Formula: FeAl2(PO4)2(OH)2.6H2O
Origin of name: for for George Vaux, Jr. (1863-1927), mineral collector, Bryn Mawr, Pennsylvania, U.S.A.
Crystal system: Triclinic
Crystal class: 1
Twinning: on {010} twin and composition plane
Unit cell: a = 9.14 Å, b = 44.60 Å, c 6.16 Å, a = 98.3°, b = 91.9°, g = 108.3°
Colour: Pale sky-blue to dark blue, greenish on exposure
Diaphaneity: Transparent to translucent
Luster: vitreous
Habit: Crystals tabular, slightly elongated, minute, radial or subparallel aggregates
Hardness: 3.5
Specific gravity: 2.40
Cleavage: None
Tenacity: Brittle
Streak: White
Synonyms/varieties:
Comments: Fluorescent
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