1 Physical Properties
1.1 Tenacity
1.2 Solubility
Soluble
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Uneven, Uneven, Gemstones (2009), Brittle
1.6 Cleavage
Poor to good on (001)
Prismatic {10 1 0}, perfect
1.7 Mohs Hardness
1.8 Chemical Composition
(Mg,Fe) 5(SiO 4) 2(F,OH) 2Ulrich Henn and Claudio C.
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references