Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.95-4.102.90-2.98
1
7.18
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Fracture
Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
{110} Perfect, {110} Perfect, {110} Perfect
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
3.5-47.5-8
2
10
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Chemical Composition
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references