General Information:
Chemical Formula:(Mn++,Ca)Mn++++4O8·(H2O)
Composition:(Molecular Weight = 419.21 gm)Calcium 0.96 %
CaManganese 64.21 %
MnHydrogen 0.48 %
H Oxygen 34.35 %
O Empirical Formula: Mn2+0.9Ca0.1Mn4+4O8·(H2O)
Environment:Oxidation zone of a braunite-rhodochrosite-Carpopilite deposit.
IMA Status:Approved IMA 1970
Locality:Nomura mine, Ehime, Japan.
Name Origin:Named for Katsutoshi Takane (1899-1945), professor of mineralogy, Tohoku University, Sendai, Japan.
Physical Properties: Cleavage:None
Color:brownish gray, black, or steel gray.
Density:3.41 - 3.425, Average = 3.41
Diaphaniety:Opaque
Habits:Massive - Uniformly indistinguishable crystals forming large masses., Inclusions - Generally found as inclusions in other minerals.,
Hardness:2.5-3 - Finger Nail-Calcite
Luster:Sub Metallic
Streak:brown black
More details...
