1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.98-2.502.74-2.90
1
7.18
1.8 Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Uneven, Gemstones (2009), Splintery
1.9 Cleavage
Not Available
Perfect on {100} and {001}
1.10 Mohs Hardness
1.13 Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Ca 2NaHSi 3O 9Ulrich Henn and Claudio C.