Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.6-5.762.90-2.98
1
7.18
👆🏻
Fracture
Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
[001] perfect; [100] distinct
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
2.5-37.5-8
2
10
👆🏻
Chemical Composition
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references