1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.69-2.722.58-2.64
1
7.18
1.13 Fracture
Uneven, Conchoidal, Gems, Sixth Edition (2006)
Not Available
1.14 Cleavage
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
Not Available
1.15 Mohs Hardness
1.18 Chemical Composition
(Na,Ca)1-2Si3-2O8
SiO 2Walter Schumann , Gemstones of the world (2001)