Franklinite
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Franklinite is an oxide mineral belonging to the normal spinel subgroup's iron series, with the formula ZnFe3+2O4.
Franklinite (black) with Zincite (red)
A microscopic picture of Franklinite
Zincite
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Zincite is the mineral form of zinc oxide. Its crystal form is rare in nature; a notable exception to this is at the Franklin and Sterling Hill Mines in New Jersey, an area also famed for its many flu
Crystal blades of zincite
Microscopic image of Zincite and Franklinite under normal light
Synthetic zincite crystals