Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.802.70-2.75
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
Perfect
From the Greek for luster, for its pearly luster on the cleavage.
Mohs Hardness
5-6.54.5-5
2
10
👆🏻
Chemical Composition
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)