Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.083.43-3.44
1
7.18
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Fracture
Subconchoidal, Uneven, Conchoidal
-
Cleavage
Poor on {100}
None Observed
Mohs Hardness
56.5-7
2
10
👆🏻
Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references