Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.05-3.083.25-3.35
1
7.18
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Fracture
Subconchoidal, Uneven, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Poor on {100}
Perfect in three directions
Mohs Hardness
55
2
10
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Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references