Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
22.90-2.98
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
Imperfect on {001}, indistinct on {011}
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
2.5-37.5-8
2
10
👆🏻
Chemical Composition
PbWO4
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references