Bulachite

minerals

senegalite

arsenocrandallite

pharmacosiderite

Formula: Al2(AsO4)(OH)3.3H2O
Hydrated arsenate containing hydroxyl
Specific gravity: 2.6
Hardness: 2
Streak: White
Colour: Colourless, white, light green
Environments

Hydrothermal 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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