Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.76-5.033.43-3.44
1
7.18
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Fracture
Conchoidal
-
Cleavage
None
None Observed
Mohs Hardness
5.5-6.56.5-7
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references