Willemite
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Willemite is a zinc silicate mineral and a minor ore of zinc. It is highly fluorescent under shortwave ultraviolet light. It occurs in a variety of colors in daylight, in fibrous masses and apple-gree
Willemite from Namibia
Willemite variety troostite from New Jersey
In natural and in ultraviolet light
Franklinite
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Franklinite is an oxide mineral belonging to the normal spinel subgroup's iron series, with the formula ZnFe3+2O4.
Willemite
…Arizona and the zinc, iron, manganese deposits at Franklin and Sterling Hill Mines in New Jersey. It often occurs with red zincite (zinc oxide) and franklinite (Fe,Mn,Zn)(Fe,Mn)2O4 (an iron rich zinc mineral occurring in sharp black isometric octahedral crystals and masses). Franklinite and zincite are not…
Franklinite (black) with Zincite (red)
A microscopic picture of Franklinite