Tenacity
-
-
Solubility
insoluble
-
Durability
-
-
Specific Gravity
6.46-6.572.50-2.80
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
-
Cleavage
Good [110] and [021]
Perfect
Mohs Hardness
3-3.55-6.5
2
10
👆🏻
Chemical Composition
PbCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)