Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.352.50-2.80
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
Perfect on {100}, imperfect on {001}
Perfect
Mohs Hardness
2.55-6.5
2
10
👆🏻
Chemical Composition
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)