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Cryptomelane - Freiberg, Revier

Collectors Summary

Chemical Formula K(Mn4+7Mn3+)O16
Color blaugrau-met.
Streak color bräunlichschwarz
Lustre Metallglanz bis Matt
Hardness (Mohs) 6.00 - 6.50
Solubility +++ HCl
Crystal System tetragonal, I4/m