Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.76-5.033.80-4.15
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
None
perfect along [010] and [100]
Mohs Hardness
5.5-6.53.5-4
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references