Franklin Furnace
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Franklin Furnace, also known as the Franklin Mine, is a famous mineral location for rare zinc, iron, and manganese minerals in old mines in Franklin, Sussex County, New Jersey, United States. This loc
Franklin Furnace ca. 1900
Fluorescent minerals of the Franklin mineral district: franklinite (black), willemite (green), and calcite (red). USGS
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