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Formula: ZnO
Simple oxide
Crystal System: Hexagonal
Specific gravity: 5.64 to 5.68 measured, 5.699 calculated
Hardness: 4
Streak: Orange-yellow
Colour: Red to orange, rarely yellow
Common impurities: Mn,Fe
Environments:
Metamorphic environments
Hydrothermal environments
Zincite can be a primary mineral in metamorphic environments.
It is also a secondary mineral altered from other
zinc
minerals in oxidised zinc-rich ore deposits, associated with zinc,
sphalerite,
smithsonite, hemimorphite and
hausmannite
(HOM).
Localities
There are two co-type localities, the Franklin mine, Franklin, and the Sterling Mine, Sterling Hill, Ogdensburg, both at the Franklin
Mining District, Sussex County, New Jersey, USA. Here
zincite is a primary mineral in metamorphosed
zinc-manganese-iron
oxide-silicate ore bodies in crystalline Franklin marble, associated with
franklinite,
willemite
and calcite
(HOM, Mindat).
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