What is Zincite?
Zincite is a vivid zinc oxide mineral, best known for saturated red, orange and yellow crystals from zinc-rich ore deposits and for spectacular market specimens from Franklin, New Jersey.
Mineralogy and structure
Reference formula: ZnO. Zincite is hexagonal with the ideal formula ZnO. Natural zincite is a genuine mineral; abundant synthetic crystals can look more perfect and colourful, so locality, inclusions and provenance matter when buying. Zincite is classified with oxides and has hexagonal crystal symmetry. Typical hardness is 4–4.5 on the Mohs scale and specific gravity is approximately 5.5–5.7.
Colour, lustre and habit
Typical colours include red, orange, yellow, green, black, colourless. The usual hexagonal, granular, massive habit and adamantine, vitreous, resinous lustre help describe a specimen, but colour alone is not diagnostic.
Formation and notable localities
Zincite forms in or is associated with oxidised zinc deposits, high-temperature metamorphic ore bodies and uncommon volcanic or fumarolic settings. Important documented localities include Franklin and Sterling Hill in New Jersey, Poland, Italy, Namibia and Russia.
Electric colour in a compact oxide
Natural zincite earns attention through colour saturation, crystal shape and locality. Red Franklin material, especially with calcite and willemite, remains a premium classic for both display and study.
Collecting and care
Moderately soft and brittle: protect sharp crystals, keep away from acids and avoid confusing synthetic material with natural zincite without provenance or analysis.
