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
Phosphor
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A phosphor is a substance that exhibits the phenomenon of luminescence; it emits light when exposed to some type of radiant energy. The term is used both for fluorescent or phosphorescent substances w
Willemite
…crystals and masses). Franklinite and zincite are not fluorescent. Artificial willemite was used as the basis of first-generation fluorescent tube phosphors. When doped with manganese ions, it fluoresces with a broad white emission band. Some versions had some of the zinc replaced with beryllium. In the…
Example of phosphorescence
Monochrome monitor
Aperture grille CRT phosphors