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Formula: Al2(AsO4)(OH)3.3H2O
Hydrated arsenate containing hydroxyl
Crystal System: Orthorhombic
Specific gravity: 2.60 measured, 2.55 calculated
Hardness: 2
Streak: White
Colour: Colourless, white, light green
Environments
Bulachite was initially found on two museum specimens collected on mine dumps at the type locality, Neubulach, Calw, Karlsruhe
Region, Baden-Württemberg, Germany. It occurs as exceedingly fine-grained needles in radial aggregates encrusting
quartz and associated with arsenocrandallite,
malachite, azurite, barium-rich
pharmacosiderite and goethite
(AM 70.214, HOM, Dana).
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