1 Physical Properties
1.1 Tenacity
1.2 Solubility
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Gems, Sixth Edition (2006)
Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
1.6 Cleavage
None
Perfect on {001}, poor on {201} with 38.5° angle between the two
1.7 Mohs Hardness
1.8 Chemical Composition
SiO2 (with a high level of nickel impurities )
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references