Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.654.95-5.0
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Uneven
Cleavage
3,1
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
74-5
2
10
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Chemical Composition
SiO 2Ulrich Henn and Claudio C.
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references