![yellow bytownite from Mexico, oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/bytownite-mexique225.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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![yellow bytownite from Mexico, oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/bytownite-mexique225.png)
![beryllonite fancy cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/beryllonite-taille-fantaisie235.png)
beryllonite
So called because of the presence of beryllium, it was named by James Dana in 1888.
![heliodore crystal of Madagascar](https://www.patrickvoillot.com/wp-content/uploads/2021/03/beryl-heliodore-cristal-madagascar236.png)
![azurite from Morocco oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/azurite-ovale-maroc242.png)
azurite
Discovered in 1824 by Beudant Chessy-les-Mines in France, azurite takes its name from its azure blue. It has been known since antiquity, it is a copper carbonate, which effervesces with acids. It is often associated with malachite, green, in copper deposits, as azurite turns into
![cushion cut green apatite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/apatite-verte-coussin248.png)
![demantoide variety of andradite garnet from Russia, oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/grenat-demantoide-vert-taille-ovale-russie208.png)
andradite
Andradite: this variety of garnet has been described and identified by Dana, its name is a tribute to a Brazilian mineralogist Jose Bonifacio de Andrada e Silva (1763-1838). Mélanite : black titanoan variety, its name comes from the Greek “black”. Topazolite : yellow variety of