1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.60-3.022.79-2.87
1
7.18
1.5 Fracture
Uneven
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
1.6 Cleavage
{001} Perfect
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
1.7 Mohs Hardness
1.8 Chemical Composition
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references