Tenacity
Brittle
-
Solubility
insoluble
-
Durability
-
-
Specific Gravity
3.15-3.213.07-3.13
1
7.18
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Fracture
Uneven, Subconchoidal
Conchoidal, Uneven
Cleavage
Perfect prismatic, two directions {110} ∧ {1 1 0} at 87°
{100} Perfect, {010} Distinct, {102} Distinct
Mohs Hardness
6-73-3.5
2
10
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Chemical Composition
LiAlSi2O6
Zn 2(Fe2+ ,Mn2+ )(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references