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
Hardystonite
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Hardystonite is a rare calcium zinc silicate mineral first described from the Franklin, New Jersey, U.S. zinc deposits. It often contains lead, which was detrimental to the zinc smelting process, so i
Hardystonite is fluorescing blue in this Franklin Furnace specimen. Red is calcite, and green is willemite (size: 7.0 × 6.0 × 3.2 cm)
Hardystonite in plain light, same sample as in fluorescent light image above right