![ilvaite pear cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/ilvaite-poire4.png)
orthorhombic
Je vous emmène à travers mes vidéos découvrir mon expérience acquise depuis plus de 30 ans a silloner le globe entier à la recherche de pierres précieuses, de rencontre mémorables mais aussi de difficulté parfois …
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![ilvaite pear cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/ilvaite-poire4.png)
mother-of-pearl
Mother-of-pearl or Nacre is the substance that constitutes the inner part of the shell of certain mollusks, its name comes from the Latin “ nacrum “, which was used to describe white matter with iridescent reflections. It consists of a mineral part of calcium carbonate
![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
![witherite round cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/witherite-ronde24.png)
![wavellite crystals from United States](https://www.patrickvoillot.com/wp-content/uploads/2021/03/wavellite-cristaux-usa27.png)
![variscite cabochon from United States](https://www.patrickvoillot.com/wp-content/uploads/2021/03/variscite-cabochon-usa33.png)
variscite
It recalls the old name of Vogtland (southern Saxony, Germany) called Variscia in Latin, where it was discovered in the valley of the Mess. A massive variety, found in the United States (Nevada,) with interpenetration of veinlets or quartz nodules and chalcedony, is called “amatrix”