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Akhtenskite

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Akhtenskite
Akhtenskite is a manganese oxide mineral with the chemical formula of MnO2 (or: e-Mn4+O2) that was named after the Akhtensk deposit in Russia, where it was first discovered and noted in 1979. It can be found in the Akhtensk brown ironstone deposit, in the southern Ural Mountains, on Mt. Zarod, on the Sikhote-Alin Mountains, and in the Primorskiy Krai, all in Russia.

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Mineralogy Database Dictionary

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Akhtenskite

General Information:
 Chemical Formula:
Mn++++O2
 Composition:
(Molecular Weight = 86.94 gm)
Manganese 63.19 % Mn
Oxygen 36.81 % 
 Empirical Formula:
Mn4+O2
 IMA Status:
Approved IMA 1983
 Locality:
TL: Russia, Urals, Akhtenskii dep
Physical Properties:
 Cleavage:
[???] Good
 Color:
gray or black.
 Density:
4
 Diaphaniety:
Opaque
 Streak:
black
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