1 Physical Properties
1.1 Tenacity
1.3 Solubility
Not Available
Not Available
1.5 Durability
Not Available
Not Available
1.6 Specific Gravity
2.60-2.651.98-2.50
1
7.18
1.12 Fracture
Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal
Conchoidal, Conchoidal, Gemstones of the world (2001)
1.13 Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Not Available
1.14 Mohs Hardness
1.18 Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)