General Information:
Chemical Formula:CaMnSi2O6
Composition:(Molecular Weight = 247.18 gm)Calcium 16.21 %
CaManganese 22.23 %
MnSilicon 22.72 %
SiOxygen 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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