1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Insoluble in acids
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Uneven, ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
Distinct on {010}
{110} good, 100 moderate, parting on {092} and {011}
1.7 Mohs Hardness
1.8 Chemical Composition
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)