Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.2-3.43.08-3.12
1
7.18
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Fracture
Uneven
ConchoidalWalter Schumann
Cleavage
Perfect on [001] imperfect on [100]
{010} Perfect
Mohs Hardness
37.5
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)
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references