General Information:
Chemical Formula:
(Bi,Pb)2Fe(PO4)(O,OH)3
Composition:
(Molecular Weight = 616.49 gm)
Iron 9.06 % Fe
Bismuth 43.05 % Bi
Phosphorus 5.02 % P
Hydrogen 0.16 % H
Lead 24.54 % Pb
Oxygen 18.17 % O
Empirical Formula:
Bi1.27Pb0.73Fe2.5+O2(OH)(PO4)
Environment:
From the dumps of the ancient (16th centry) Guldener Falk silver mine. Chemically related to paulkerrite.
IMA Status:
Approved IMA 1999 (Dana # Added)
Locality:
TL: Near Schneeberg, Saxony, Germany.
Name Origin:
Named for Christain Friedrick Brendel (1776-1861), in recognition of his development and application of mechanized mining technology.
Physical Properties:
Cleavage:
None
Color:
black or dark brown.
Density:
6.83
Diaphaniety:
Opaque to translucent
Habits:
Crystalline - Fine - Occurs as well-formed fine sized crystals., Euhedral Crystals - Occurs as well-formed crystals showing good external form., Aggregates - Made of numerous individu al crystals or clusters.
Hardness:
4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Adamantine
Streak:
light brown
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