Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.13-3.756.5-7.1
1
7.18
👆🏻
Fracture
Subconchoidal, Uneven, Conchoidal
Uneven, Conchoidal
Cleavage
Poor on {100}
Imperfect- [10 1 1]
Mohs Hardness
63.5-4
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 9(SiO 4) 4(F,OH)) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)