General Information:
Chemical Formula:
(Ca,Mg)Mg7(Al,Fe+++)2(SO4)2(OH)18·12(H2O)
IMA Status:
Approved IMA 1971
Physical Properties:
Cleavage:
[0001] Perfect
Color:
bluish or greenish gray.
Density:
1.932
Hardness:
1.5 - Between Talc and Gypsum
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