1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.2 Durability
Not Available
Not Available
1.6 Specific Gravity
1.17 Fracture
Uneven
Uneven, Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven, Subconchoidal, Brittle, Metallic, Brittle, Metallic
1.18 Cleavage
None
{101}, good; {010}, poor
1.19 Mohs Hardness
1.20 Chemical Composition
(Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)