General Information:
Chemical Formula:MnO2
Composition:(Molecular Weight = 86.94 gm)Manganese 63.19 %
MnOxygen 36.81 %
O Empirical Formula: Mn4+O2
Environment:Manganese deposits with pyrolucite.
Locality:Lake Valley, Sierra County, New Mexico.
Name Origin:Named after the American mineralogist, Lewis S. Ramsdell (1895-1975), of the University of Michigan, who first described the mineral.
Physical Properties: Cleavage:[???] Good
Color:iron black, black, or steel gray.
Density:4.37
Diaphaniety:Opaque
Habits:Massive - Fibrous - Distinctly fibrous fine-grained forms., Granular - Generally occurs as anhedral to subhedral crystals in matrix., Platy - Sheet forms (e.g. micas).
Hardness:3 - Calcite
Luster:Metallic
Streak:brownish black
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