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Willemite

The first, and self-proclaimed, King of the Netherlands, William I, has the honor of Willemite being named for him. At the time, the type locality of Willemite was in the Netherlands. Willemite is a secondary mineral, usually in limestone-developed zinc deposits. An uncommon but important ore of zinc at some of its many widespread localities. Willemite is highly fluorescent as a yellow-green to –orange under both short-wave and long-wave ultraviolet light and may also be phosphorescent.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/willemite.pdf

Witherite

Named for Dr. William Withering, an English mineralogist, botanist, chemist, and physician who was the first to describe the mineral. Occurs typically as a product of alteration of barite in low-temperature hydrothermal deposits, though it is possible that it can be of sedimentary origin with the barium being supplied by volcanic activity in hot springs. Can also be found, albeit rarely, in coal. Witherite is a widespread mineral with many localities worldwide.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/witherite.pdf

Wittichenite

Named for its type locality at Wittichen in the Black Forest of Germany. Wittichenite occurs with other bismuth minerals in hydrothermal veins such as at Wittichen, with Cu-Fe sulfides as at Seawaith Tarn, England, and with secondary uranium minerals and selenides of copper, lead, and bismuth as at Kletno, Poland. Wittichenite is a widely distributed mineral.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/wittichenite.pdf

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