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Formula: ZnFe3+2O4
Multiple oxide, spinel subgroup
Specific gravity: 5.2
Hardness: 5½ to 6½
Streak: Reddish brown to black
Colour: Black
Solubility: Soluble in hydrochloric acid
Common impurities: Mn2+, Mn3+, Fe2+, Ti,Al,Ca
Environments:
Franklinite occurs in a zinc-rich orebody of marine carbonate sediments, weathered and later
metamorphosed at high temperature
(Webmin HOM), associated with zincite,
willemite,
calcite, andradite,
manganosite,
rhodochrosite,
gahnite, magnetite,
rhodonite, hausmannite,
hetaerolite,
jacobsite, braunite,
sarkinite, berzeliite
and hematite
(HOM).
At Franklin, New Jersey, USA, franklinite has been found here with hodgkinsonite
and calcite
(FM 38396).
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