![tanzanite from Tanzania rectangular cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/tanzanite-tanzanie-triangle48.png)
Pisces
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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![tanzanite from Tanzania rectangular cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/tanzanite-tanzanie-triangle48.png)
![cabochon of hackmanite from Afghanistan](https://www.patrickvoillot.com/wp-content/uploads/2021/03/hackmanite-cabochon-afghanistan63.png)
sodalite
This is a feldspathoid, his name refers to its high sodium content. Its purplish-blue color is often streaked with white feldspar veinlets. The Hackmanite is a pink-purple variety discovered in Quebec, Canada. In its formula sulfur has been replaced by chlorine, and has an amazing
![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
![oval cut pyrite from Madagascar](https://www.patrickvoillot.com/wp-content/uploads/2021/03/pyrite-taille-ovale-madagascar-85.png)
![pear cabochon of blue pietersite from China](https://www.patrickvoillot.com/wp-content/uploads/2021/03/pietersite-cabochon-bleue-chine93.png)
pietersite
Discovered in 1962 by Pieters in Namibia, this breach consists of an hawk eye and a tiger’s eye (crocidolite). Subsequently, it was discovered in China a rock quite close in appearance to Pietersite, which would be a amphibole rich in torendrikite instead of crocidolite. This
![opal from Australia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/opale-cabochon-australie110.png)
opal
Its name comes from the Sanskrit “upala” which means precious stone, or the Greek “opallios” and Latin “opalos”. It is distinguished by iridescent reflections depending on the angle of vision, recalling the rainbow, who gave the term “opalescent”. Hydrated silica gel, it does not crystallize.