![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)
![heart cut ulexie](https://www.patrickvoillot.com/wp-content/uploads/2021/03/ulexite-coeur37.png)
ulexite
Named in honor of the German chemist George Ulex (1811-1883). We notice a rare property: if the ends of a thick plate are well polished perpendicular to the longitudinal direction of its crystal fibers, they behave like optical fibers. A Printed text placed below appears
![cabochon of turquoise from Iran](https://www.patrickvoillot.com/wp-content/uploads/2021/03/turquoise-matrix-cabochon-iran38.png)
turquoise
This is simply the “Turkish stone” because when this gem came to Europe, it had passed through that country, but it came from Persia. The Greeks called it “callaite”. It was a sacred stone for the Egyptians, Persians, Tibetans, Indians, Mayans, Aztecs and Incas. Color
![triphyllite from Brazil](https://www.patrickvoillot.com/wp-content/uploads/2021/03/triphyllite-bresil41.png)
triphylite
Its name comes from the Greek “tria” for 3 and “phylon” family to signify that it contains three cations because it was believed that it contained lithium, magnesium and iron.
![green tremolite of Tanzania oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/tremolite-ovale-tanzanie42.png)
tremolite
She was named in 1789 by the mineralogist J.G.A. Höpfner in relation to its supposed place of discovery: the Val Tremola in the St. Gotthard massif in Switzerland, but the sample was from another valley … Campolungo. Chemically very close to actinolite (tremolite does not
![thorite round cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/thorite-ronde46.png)