![cabochon of ussingite from Russia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/ussingite-russie35.png)
translucent
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 ussingite from Russia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/ussingite-russie35.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
![tugtupite cabochon from Greenland](https://www.patrickvoillot.com/wp-content/uploads/2021/03/tugtupite-cabochon-groenland39.png)
tugtupite
Mineral discovered in 1960 simultaneously in the Kola Peninsula (Russia) and south of Greenland, its name comes from an Inuit word meaning ” Reindeer blood ” (“tugtup” means reindeer in Eskimo). Stone of a beautiful color. Without light it loses its color, and after returning
![triplite from Pakistan oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/triplite-pakistan40.png)
triplite
Its name comes from the Greek “triplos” for triple, as it has cleavages in three directions, it forms a series with the zwieselite, which is the fluorinated pole. It is found in granitic pegmatites and it was identified in the Chanteloube, Haute-Vienne in France. The
![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