Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.751.98-2.50
1
7.18
👆🏻
Fracture
Conchoidal
ConchoidalWalter Schumann
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
None
Mohs Hardness
4.5-55.5-6.5
2
10
👆🏻
Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)