Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.95-4.102.9
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
{110} Perfect, {110} Perfect, {110} Perfect
{???} Indistinct
Mohs Hardness
3.5-44.5
2
10
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Chemical Composition
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)