1 Physical Properties
1.1 Tenacity
1.2 Solubility
Soluble
Poorly soluble in dilute HCl
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.10-3.202.80-2.95
1
7.18
1.5 Fracture
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
1.6 Cleavage
Poor to good on (001)
Perfect on {10 1 1}, rhombohedral cleavage
1.7 Mohs Hardness
1.8 Chemical Composition
(Mg,Fe) 5(SiO 4) 2(F,OH) 2Ulrich Henn and Claudio C.
CaMg(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references