Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.2-3.43.20-3.25
1
7.18
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Fracture
Uneven
Uneven, Conchoidal
Cleavage
Perfect on [001] imperfect on [100]
Good/distinct on [210]
Mohs Hardness
35.5
2
10
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Chemical Composition
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Mg 2Si 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references