Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
4.76-5.035.50-5.90
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
None
On {10 1 0}, perfect; parting on {000 1 }
Mohs Hardness
5.5-6.54
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)