General Information:
Chemical Formula:
CaMnSi2O6
Composition:
(Molecular Weight = 247.18 gm)
Calcium 16.21 % Ca
Manganese 22.23 % Mn
Silicon 22.72 % Si
Oxygen 38.84 % O
Empirical Formula:
CaMn2+(Si2O6)
Environment:
Contact metasomatic rocks.
IMA Status:
Approved IMA 1987
Locality:
Empire Zinc Company mine near Hanover, Grant County, New Mexico.
Name Origin:
Named after Prof. Albert Johannsen of the University of Chicago.
Physical Properties:
Cleavage:
[110] Good
Color:
brown, brownish black, greenish, gray, or gray green.
Density:
3.56
Diaphaniety:
Translucent to opaque
Habits:
Acicular - Occurs as needle-like crystals., Massive - Granular - Common texture observed in granite and other igneous rock.,
Hardness:
6 - Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
greenish gray
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