1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
Not Available3.13-3.75
1
7.18
1.5 Fracture
(e.g. graphite).
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
1.6 Cleavage
{???} Imperfect, {???} Imperfect
Poor on {100}
1.7 Mohs Hardness
1.8 Chemical Composition
Not Available
(Mg,Fe2+ ) 9(SiO 4) 4(F,OH)) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references