Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.50-3.603.2-3.4
1
7.18
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Fracture
Uneven
Uneven
Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Perfect on [001] imperfect on [100]
Mohs Hardness
63
2
10
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Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)