Esperite

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Esperite under ultraviolet light
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Esperite under ultraviolet light

Esperite is a rare complex lead zinc silicate (PbCa3Zn4(SiO4)4) that used to be called calcium larsenite. It occurred in the Parker Shaft of the famous Franklin Furnace zinc deposits. It has a white, greasy appearance in daylight and is much prized for its brilliant yellow green fluorescence under shortwave ultraviolet light.

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