Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.645.35
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Conchoidal
Cleavage
Absent
Perfect on {100}, imperfect on {001}
Mohs Hardness
6.5-72.5
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)