Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.42-2.583.34-3.44
1
7.18
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Fracture
Conchoidal, Splintery, ConchoidalWalter Schumann
Conchoidal
Cleavage
[010] perfect
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
4-58-8.5
2
10
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Chemical Composition
AlPO4 · 2(H2O)
(K,Cs)Al 4Be 4(B,Be) 12O 28Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references