Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.642.70-2.75
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Conchoidal
Cleavage
Absent
From the Greek for luster, for its pearly luster on the cleavage.
Mohs Hardness
6.5-74.5-5
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)