Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.98-2.504.95-5.0
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven
Cleavage
None
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
5.5-6.54-5
2
10
👆🏻
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references