Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.42-2.583.13-3.75
1
7.18
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Fracture
Conchoidal, Splintery, ConchoidalWalter Schumann
Subconchoidal, Uneven, Conchoidal
Cleavage
[010] perfect
Poor on {100}
Mohs Hardness
4-56
2
10
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Chemical Composition
AlPO4 · 2(H2O)
(Mg,Fe2+ ) 9(SiO 4) 4(F,OH)) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references