Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.76-5.033.25-3.50
1
7.18
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Fracture
Conchoidal
Conchoidal, Fibrous
Cleavage
None
{001} perfect and {100} imperfect
Mohs Hardness
5.5-6.56-7
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references