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Formula: Al5Sb5+3O14(OH)2
Antimonate
Crystal System: Monoclinic
Specific gravity: 4.78 to 5.46 measured, 5.26 calculated
Hardness: 9
Streak: White
Colour: Tan to cream, crystals in vugs colourless, tan or pale violet
Environments
Localities
At the type locality, the Pico das Almas river, Paramirim das Crioulas, Érico Cardoso, Bahia, Brazil,
bahianite occurs as water-worn tan to cream stream-worn pebbles and as residual concentrates above
weathered volcanic rock. Associated minerals include viridine,
staurolite, quartz,
andalusite, kyanite,
gold, diaspore,
eskolaite and cassiterite;
crystals in vugs are colourless, tan or pale violet
(AM 64.464, Mindat).
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