Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.805.50-5.90
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
Perfect
On {10 1 0}, perfect; parting on {000 1 }
Mohs Hardness
5-6.54
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)
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)