Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.653.95-4.10
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Uneven
Cleavage
3,1
{110} Perfect, {110} Perfect, {110} Perfect
Mohs Hardness
73.5-4
2
10
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Chemical Composition
SiO 2Ulrich Henn and Claudio C.
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references