1 Physical Properties
1.2 Tenacity
Not Available
Not Available
1.3 Solubility
Not Available
Not Available
1.4 Durability
Not Available
Not Available
1.6 Specific Gravity
3.85-3.942.62-2.67
1
7.18
1.9 Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Uneven
Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven
1.10 Cleavage
{010} Good, {100} Distinct
From the Greek, oligos and kasein, little cleavage.
1.11 Mohs Hardness
1.12 Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)