Formula: BaAl3H(AsO4)1.5(PO4)0.5(OH)6
Origin of name: after the type locality, Weiler, near Lahr, Germany
Crystal system: Trigonal
Crystal class: 3 2/m
Twinning:
Unit cell: a = 7.11, c = 17.38
Colour: White
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit:
Hardness: 5
Specific gravity:
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments: Redefined as arsenogorceixite
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