![cabochon of African unakite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/unakite-cabochon-afrique36.png)
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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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![cabochon of African unakite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/unakite-cabochon-afrique36.png)
![rubellite variety of tourmaline from Brazil](https://www.patrickvoillot.com/wp-content/uploads/2021/03/tourmaline-rose-taillee-bresil43.png)
tourmaline
Its name comes from Sri Lanka, Ceylon, where it was called “tourmali” or “torra molli”, stone attracting ashes, it is considered as a colored zircon. It was not until 1703 that the Dutch brought it to Europe. It was identified by Buffon in 1759. It
![sugilite from Wessels Mine, Kalahari in South Africa, cabochon cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/sugilite-cabochon-wessels-mine-kalahari-afrique-du-sud51.png)
![staurolite from Brazil oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/staurotide-ovale-bresil56.png)
staurolite
It is named after his twins very frequently cross-shaped: the twin cross of St. Andrew (60 degrees) and that of the Greek cross (90 degrees), in Greek “stauros” means cross and “lithos”, stone, hence its name “cross stone”. Another twin “in wheel”shape exists in the
![cushion cut spinel from Tanzania](https://www.patrickvoillot.com/wp-content/uploads/2021/03/spinelle-coussin-tanzanie57.png)
![scapolite from Tanzania drop cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/scapolite-tanzanie-goutte71.png)
scapolite
It owes its name to its prismatic facies (from the Greek “skapos” rod and “lithos”, stone) and designates an isomorphic series going from sodic marialite to calcic meionite. The members of this series are the Wernerite, the Dipyre, the Meionite, the Marialite. The Wernerite, which