Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.53.50-3.60
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
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)
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.