General Information:
Chemical Formula:
Ca2(Fe+++,Al)Mn+++Mn++3Zn2Si2O10(OH)8
Composition:
(Molecular Weight = 831.54 gm)
Calcium 9.64 % Ca
Manganese 26.43 % Mn
Aluminum 0.81 % Al
Zinc 15.73 % Zn
Iron 5.04 % Fe
Silicon 6.76 % Si
Hydrogen 0.97 % H
Oxygen 34.63 % O
Empirical Formula:
Ca2Fe3+0.75Al0.25Mn3+Mn2+3Zn2Si2O10(OH)8
IMA Status:
Approved IMA
Physical Properties:
Cleavage:
[???] Perfect
Color:
dark brown.
Density:
3.66
Diaphaniety:
Translucent
Hardness:
3 - Calcite
Luster:
Vitreous (Glassy)
Streak:
brown
More details...