General Information:
Chemical Formula:
Bi2(AsO4)(OH)3
Composition:
(Molecular Weight = 607.90 gm)
Bismuth 68.75 % Bi
Arsenic 12.32 % As
Hydrogen 0.50 % H
Oxygen 18.42 % O
Empirical Formula:
Bi2(AsO4)(OH)3
Environment:
Oxidized ore at the 200 m level. An inadequately described species no discredited as being a preisingerite-rich concentrate with atelestite and beudantite.
IMA Status:
Discredited IMA 1999
Locality:
Mamoth mine, Tintic District, Utah, USA.
Name Origin:
Named for it's composition.
Physical Properties:
Color:
green, yellowish green, or brownish green.
Density:
5.7
Habits:
Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye., Pulverulent - Forms a loose, poorly-coherent powdery mass., Friable - Loosley cohesive material th at granulates with your fingers.
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Streak:
greenish yellow
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