General Information: Chemical Formula:(Mn++++1-x)(Mn++x)(O2-2x)(OH2x) where x = 0.06-0.07
Composition:(Molecular Weight = 87.24 gm)
Manganese 62.97 %
MnHydrogen 0.35 %
H Oxygen 36.68 %
O Empirical Formula: Mn4+0.85O1.7Mn2+0.15OH0.3
Environment:Oxidation of manganese carbonate minerals. Found in most major manganese deposits.
IMA Status:Approved IMA 1962
Locality:Nsuta, Ghana.
Name Origin:Named for the locality.
Physical Properties: Color:grayish black, dark gray, or black.
Density:4.24 - 4.67, Average = 4.45
Diaphaniety:Opaque
Habits:Massive - Uniformly indistinguishable crystals forming large masses., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).,
Hardness:6.5-8.5
Luster:Earthy (Dull)
Streak:black
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