Specific Gravity
2.35-2.60
3.95-4.10
Fracture
Conchoidal, ConchoidalWalter Schumann
Uneven
Cleavage
None
{110} Perfect, {110} Perfect, {110} Perfect
Mohs Hardness
5-5.5
3.5-4
Chemical Composition
SiO2
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references