![thulite of Norway cut in cabochon](https://www.patrickvoillot.com/wp-content/uploads/2021/03/thulite-norvege-cabochon20.png)
very strong
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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![thulite of Norway cut in cabochon](https://www.patrickvoillot.com/wp-content/uploads/2021/03/thulite-norvege-cabochon20.png)
![tanzanite from Tanzania rectangular cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/tanzanite-tanzanie-triangle48.png)
![nodule of malachite from Zaire](https://www.patrickvoillot.com/wp-content/uploads/2021/03/malachite-nodule-zaire129.png)
![green lazulite from Pakistan emerald cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/lazulite-taille-emeraude-pakistan139.png)
lazulite
Not to be confused with lazurite, the main constituent of lapis lazuli. Lazulite is also called Klaprothite, in honor of the German mineralogist Klaproth (1743-1817) who discovered titanium and uranium, and described this stone. The name fell into disuse but it would avoid confusion between
![cushion cut iolite from India](https://www.patrickvoillot.com/wp-content/uploads/2021/03/cordierite-iolite-inde202.png)
iolite
It was also known as “dichroïte” (because of its strong dichroism) or “iolite” (because of its purple color), the anglo-saxons still call it by that name. It honors the name of the French geologist Cordier, Professor at the National Museum of Natural History in Paris.