Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.95-4.103.10-3.20
1
7.18
👆🏻
Fracture
Uneven
Uneven, Conchoidal
Cleavage
{110} Perfect, {110} Perfect, {110} Perfect
Poor to good on (001)
Mohs Hardness
3.5-46-6.5
2
10
👆🏻
Chemical Composition
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe) 5(SiO 4) 2(F,OH) 2Ulrich Henn and Claudio C.