Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.806.50-7.00
1
7.18
👆🏻
Fracture
-
Irregular, Conchoidal
Cleavage
Perfect
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
5-6.53
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)
PbMoO 4Walter Schumann , Gemstones of the world (2001)