Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.66-2.863.07-3.13
1
7.18
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Fracture
ConchoidalWalter Schumann
Conchoidal, Uneven
Cleavage
Indiscernible
{100} Perfect, {010} Distinct, {102} Distinct
Mohs Hardness
7.5-83-3.5
2
10
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Chemical Composition
Al 2Be 3Si 6O 18Martin H.
Zn 2(Fe2+ ,Mn2+ )(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references