Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.752.60-2.64
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Splintery, Conchoidal
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
Absent
Mohs Hardness
4.5-56.5-7
2
10
👆🏻
Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2Arthur Thomas , Gemstones (2009)