Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
4.76-5.032.90-2.98
1
7.18
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Fracture
Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
None
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
5.5-6.57.5-8
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references