Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.76-5.033.04-3.17
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
None
{001} Indistinct, {???} Indistinct
Mohs Hardness
5.5-6.55.5
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references