Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.803.7-3.8
1
7.18
👆🏻
Fracture
-
Subconchoidal, Conchoidal
Cleavage
Perfect
Distinct on {010}
Mohs Hardness
5-6.57-7.5
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)
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.