Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.353.7-3.8
1
7.18
👆🏻
Fracture
Conchoidal
Subconchoidal, Conchoidal
Cleavage
Perfect on {100}, imperfect on {001}
Distinct on {010}
Mohs Hardness
2.57-7.5
2
10
👆🏻
Chemical Composition
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.