![cabochon of hackmanite from Afghanistan](https://www.patrickvoillot.com/wp-content/uploads/2021/03/hackmanite-cabochon-afghanistan63.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 hackmanite from Afghanistan](https://www.patrickvoillot.com/wp-content/uploads/2021/03/hackmanite-cabochon-afghanistan63.png)
![yellow - green sillimanite from Tanzania](https://www.patrickvoillot.com/wp-content/uploads/2021/03/sillimanite-tanzanie67.png)
sillimanite
Discovered in 1824, it honors the name of the American geologist Benjamin Silliman (1779-1864). It is also known for its blue or violet variety called fibrolite. It has been known since prehistoric times and it was used to manufacture cutting tools. There is also a
![scorzalite round cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/scorzalite-taille-rone10.png)
scorzalite
Discovered in 1957 in Brazil (Corrego Firo pegmatite, Linopolis, Doce valley, Minas Gerais). Its name honors the Brazilian geologist who discovered it: Evaristo Penna Scorza (1899-1969).
![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
![oval cut sapphirine from Sri lanka](https://www.patrickvoillot.com/wp-content/uploads/2021/03/sapphirine-taille-ovale-sri-lanka72.png)
sapphirine
It takes its name from its blue color, recalling the sapphire. It was discovered in Greenland in 1819 .
![blue sapphire from Sri Lanka cushion cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/saphir-coussin-sri-lanka73.png)
sapphire
Its name comes from the Hebrew “Sappir” which referred for a long time the blue gems, the “most beautiful things”. By 1800, it was shown that the ruby and sapphire were only varieties of the same mineral, corundum. Currently, sapphire corresponds to all the blue