Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
{110} Perfect, {110} Perfect, {110} Perfect
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Perfect on {100}, imperfect on {001}
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)