Tenacity
-
Brittle
Solubility
-
Nearly insoluble in HCl and HNO3
Durability
-
-
Specific Gravity
2.9-3.52.97
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Distinct on {010}
Mohs Hardness
5.5-66
2
10
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Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
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