Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Distinct on {110}, imperfect on {010}, poor on {001}
{110} Perfect, {110} Perfect, {110} Perfect
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references