Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.083.2-3.4
1
7.18
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Fracture
Subconchoidal, Uneven, Conchoidal
Uneven
Cleavage
Poor on {100}
Perfect on [001] imperfect on [100]
Mohs Hardness
53
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)