![cabochon of ussingite from Russia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/ussingite-russie35.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 ussingite from Russia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/ussingite-russie35.png)
![tanzanite from Tanzania rectangular cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/tanzanite-tanzanie-triangle48.png)
![violet taaffeite of Sri Lanka round cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/titanite-sphene-chromifere50.png)
![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)
![pink spherocobaltite from Morocco](https://www.patrickvoillot.com/wp-content/uploads/2021/03/spherocobaltite-maroc58.png)
spherocobaltite
ck_admin
March 24, 2021
Its name comes from the Greek “sphaira” for sphere and from its composition with cobalt, which gives it its color, this is a rare stone. It’a a Cobalt Carbonate that is often wrongly called “cobaltoan calcite” Cobaltoan calcite chemically is a pink calcite owed to
![cabochon of sogdianite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/sogdianite-cabochon62.png)
sogdianite
ck_admin
March 24, 2021
Discovered in 1968 in Tajikistan, it owes its name to Sogdiana, who is the former name of this Central Asian region.