Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.43-3.443.2-3.4
1
7.18
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Fracture
-
Uneven
Cleavage
None Observed
Perfect on [001] imperfect on [100]
Mohs Hardness
6.5-73
2
10
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Chemical Composition
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)