Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.95-4.103.32-3.43
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
{110} Perfect, {110} Perfect, {110} Perfect
Poor on {110} and {100} very poor on {001}
Mohs Hardness
3.5-46-7
2
10
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Chemical Composition
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4