Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.13-3.752.7-3.3
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
Uneven, Even
Cleavage
Poor on {100}
Perfect on the {001}
Mohs Hardness
62.5-3.0
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 9(SiO 4) 4(F,OH)) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
K(Mg,Fe++)3[AlSi3O10(OH,F)2