Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.7-3.33.20-3.32
1
7.18
👆🏻
Fracture
Uneven, Even
Uneven, Conchoidal
Cleavage
Perfect on the {001}
Poor
Mohs Hardness
2.5-3.06-6.5
2
10
👆🏻
Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2
(Mg,Fe2+ ) 7(SiO 4) 3(F,OH) 2Anthony et al , Handbook of mineralogy (2001)