Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
6.50-7.002.50-2.80
1
7.18
👆🏻
Fracture
Irregular, Conchoidal
-
Cleavage
On {011}, distinct; on {001}, {013}, indistinct
Perfect
Mohs Hardness
35-6.5
2
10
👆🏻
Chemical Composition
PbMoO 4Walter Schumann , Gemstones of the world (2001)
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)