Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.352.90-3.10
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
Perfect on {100}, imperfect on {001}
Poor/indistinct on {1120} and {1011}
Mohs Hardness
2.57
2
10
👆🏻
Chemical Composition
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references