Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.773.05-3.08
1
7.18
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Fracture
-
Uneven, Irregular, Conchoidal
Cleavage
{110} Perfect, {110} Perfect
None
Mohs Hardness
5-66.5
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
Ca 3Al 2(SiO 4) 3-x(OH) 4x (x=0.2 to 1.5)Anthony et al , Handbook of mineralogy (2001)