1 Physical Properties
1.1 Tenacity
1.4 Solubility
Not Available
Not Available
1.6 Durability
Not Available
Not Available
1.9 Specific Gravity
1.98-2.503.50-3.60
1
7.18
1.12 Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Uneven, Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
1.13 Cleavage
Not Available
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
1.14 Mohs Hardness
1.15 Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.