Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.95-4.101.79
1
7.18
👆🏻
Fracture
Uneven
Irregular/uneven
Cleavage
{110} Perfect, {110} Perfect, {110} Perfect
Perfect on {10bar10}
Mohs Hardness
3.5-42.5
2
10
👆🏻
Chemical Composition
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)