Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.76-5.034.95-5.0
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
None
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
5.5-6.54-5
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references