Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.775.35
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Perfect [001] good [010] poor [110]
Perfect on {100}, imperfect on {001}
Mohs Hardness
6-6.52.5
2
10
👆🏻
Chemical Composition
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)