General Information:
Chemical Formula:
Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O)
IMA Status:
Approved IMA 1981
Physical Properties:
Cleavage:
[001] Perfect
Color:
dark brown.
Density:
3.24
Hardness:
6 - Orthoclase
Streak:
greenish brown
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