Esperite, calcite and willemite

This is on of the more difficult combos to photograph. It a large rock, more than fist-sized. All three colors are caused by manganese as an activator. There's also some hardystonite on the back side of this specimen but that glows too weak to be captured on photo.

Locality: Franklin mine, Franklin mining district, Sussex County, New Jersey, U.S.A.

Source: Fluorescent Minerals Workgroup MKA


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