Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.07-3.133.69-3.81
1
7.18
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Fracture
Conchoidal, Uneven
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
{100} Perfect, {010} Distinct, {102} Distinct
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
3-3.58.5
2
10
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Chemical Composition
Zn 2(Fe2+ ,Mn2+ )(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
BeAl 2 O 4