Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.7-3.33.95-4.10
1
7.18
👆🏻
Fracture
Uneven, Even
Uneven
Cleavage
Perfect on the {001}
{110} Perfect, {110} Perfect, {110} Perfect
Mohs Hardness
2.5-3.03.5-4
2
10
👆🏻
Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references