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Abswurmbachite

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Abswurmbachite
Abswurmbachite is a copper manganese silicate mineral ((Cu,Mn2+)Mn3+6O8SiO4). It was first described in 1991 and named after Irmgard Abs-Wurmbach (born 1938), a German mineralogist. It crystallizes in the tetragonal system. Its Mohs scale rating is 6.5 and a specific gravity of 4.96. It has a metallic luster and its color is jet black, with light brown streaks.

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Mineralogy Database Dictionary

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Abswurmbachite

General Information:
 Chemical Formula:
Cu++Mn+++6SiO12
 Composition:
(Molecular Weight = 613.25 gm)
Manganese 53.75 % Mn
Silicon 4.58 % Si
Copper 10.36 % Cu
Oxygen 31.31 % 
 Empirical Formula:
CuMn3+6SiO12
 IMA Status:
Approved IMA 1990
 Locality:
TL: Greece, Milli, Avia and Andros Island
Physical Properties:
 Cleavage:
None
 Color:
black or dark brown.
 Density:
4.96
 Diaphaniety:
Opaque
 Hardness:
6.5 - Pyrite
 Luster:
Metallic
 Streak:
brownish black
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