Tenacity
-
-
Solubility
insoluble in common solvents
-
Durability
-
-
Specific Gravity
2.653.05-3.08
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Subconchoidal, Uneven, Conchoidal
Cleavage
Indiscernible
Poor on {100}
Mohs Hardness
75
2
10
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Chemical Composition
SiO2
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)