![native silver crystals from Mexico](https://www.patrickvoillot.com/wp-content/uploads/2021/03/argent-natif-cristaux-mexique2.png)
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![native silver crystals from Mexico](https://www.patrickvoillot.com/wp-content/uploads/2021/03/argent-natif-cristaux-mexique2.png)
![thulite of Norway cut in cabochon](https://www.patrickvoillot.com/wp-content/uploads/2021/03/thulite-norvege-cabochon20.png)
zoisite
Identified by Werner in 1805 in the Austrian Alps, it was named after the Austrian Siegmund Zois, Baron von Edelstein (1747-1819). It is part of the epidote group. Its best-known variety is tanzanite which is not a mineral recognized by the International Mineralogical Commission for
![wolframite emerald cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/wolframite-taille-emeraude23.png)
wolframite
Its name comes from the german, “ wolfram” being the name of tungsten, which is its main component. The hubnerite variety is rich in manganese, of a rather red color, transparent and in slices, it was named after the german Adolph Huebner. The ferberite variety
![witherite round cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/witherite-ronde24.png)
![emerald cut willemite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/willemite-taille-emeraude25.png)
![whewellite fancy cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/whewellite-taille-fantaisie26.png)
whewellite
It honors the name of the English mineralogist William Whewell (1794-1866). It is a component of kidney stones. The fine twinned crystals result from the reaction of the urine of horses working in the mines with the host rock.