Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.752.55-2.65
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
Perfect {10 1 0}
Mohs Hardness
4.5-55.5-6
2
10
👆🏻
Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)