1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Insoluble in acids
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Conchoidal, Brittle, Conchoidal
Uneven, ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
Good on [110] and on [001]
{110} good, 100 moderate, parting on {092} and {011}
1.7 Mohs Hardness
1.8 Chemical Composition
[ ]Na2(Mg3Al2)Si8O22(OH)2
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)