General Information:
Chemical Formula:
Bi5Fe+++3(Te++++O3)(Te++++++O4)2O9·9(H2O)
Composition:
(Molecular Weight = 1,933.37 gm)
Iron 8.67 % Fe
Bismuth 54.05 % Bi
Tellurium 19.80 % Te
Hydrogen 0.94 % H
Oxygen 16.55 % O
Empirical Formula:
Bi5Fe3+3(TeO3)(TeO4)2·9(H2O)
Environment:
Oxidation of tetradymite and pyrite.
IMA Status:
Approved IMA
Locality:
Yecora, Sonora, Mexico.
Name Origin:
Named for the locality.
Physical Properties:
Color:
yellow, resin yellow, or orange.
Density:
5.59
Habits:
Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye., ,
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Resinous
Streak:
yellow
More details...