1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.4 Durability
Not Available
Not Available
1.5 Specific Gravity
1.98-2.503.05-3.21
1
7.18
1.8 Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
1.9 Cleavage
Not Available
Good on {110}, poor on {100}
1.10 Mohs Hardness
1.14 Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references