1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Uneven
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
1.6 Cleavage
None
Good on {110}, poor on {100}
1.7 Mohs Hardness
1.8 Chemical Composition
(Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references