![muscovite crystals from Afghanistan](https://www.patrickvoillot.com/wp-content/uploads/2021/03/muscovite-cristal-tchombarak-kunnar-nouristan-afghanistan117.png)
colourless
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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![muscovite crystals from Afghanistan](https://www.patrickvoillot.com/wp-content/uploads/2021/03/muscovite-cristal-tchombarak-kunnar-nouristan-afghanistan117.png)
![oval cut montebrasite from Brazil](https://www.patrickvoillot.com/wp-content/uploads/2021/03/montebrasite-ovale-bresil118.png)
montebrasite
ck_admin
March 24, 2021
Close to amblygonite, ows its name to Montebras in France, in the Creuse. The majority of gems called “amblygonite” are chemically closer to the “ montebrasite “.
![baguette cut mesolite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/mesolite-baguette127.png)
![emerald cut magnesite from Brazil](https://www.patrickvoillot.com/wp-content/uploads/2021/03/magnesite-taille-emeraude-bresil131.png)
![fancy cut hyalophane from Bosnia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/hyalophane-taille-fantaisie153.png)
hyalophane
ck_admin
March 24, 2021
Discovered in 1855, it owes its name to the Greek “hyalos” – glass-, and “Phanos” – which has the appearance.
![herderite crystal from Minas Gerais in Brazil](https://www.patrickvoillot.com/wp-content/uploads/2021/03/herderite-cristal-minas-gerais-bresil161.png)