Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
4.76-5.036.46-6.57
1
7.18
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Fracture
Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
None
Good [110] and [021]
Mohs Hardness
5.5-6.53-3.5
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
PbCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references