![petalite emerald cut from Brazil](https://www.patrickvoillot.com/wp-content/uploads/2021/03/petalite-taille-emeraude-bresil99.png)
pearly
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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![petalite emerald cut from Brazil](https://www.patrickvoillot.com/wp-content/uploads/2021/03/petalite-taille-emeraude-bresil99.png)
![silver color pearl from Lombok in Indonesia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/perle-silver-culture-lombok-indonesie100.png)
![olgoclase from Brasil oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/oligoclase-ovale-bresil111.png)
oligoclase
From the family of plagioclase, its name comes from the Greek “oligo”, a little bit, and “klassos” break, because it is a feldspar whose cleavage is more difficult than for others. It is part of the albite-anorthite series. It was identified by Breithaupt in 1826.
![emerald cut natrolite from Russia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/natrolite-taille-emeraude-russie116.png)
![muscovite crystals from Afghanistan](https://www.patrickvoillot.com/wp-content/uploads/2021/03/muscovite-cristal-tchombarak-kunnar-nouristan-afghanistan117.png)
muscovite
Discovered by the famous mineralogist James Dwight Dana in 1850, it owes its name to the “glass of Moscow” (vitrum muscoviticum), as the large plates, heat-resistant were used as windows for stoves and furnaces in this region. The hardness varies from one to two depending
![oval cut montebrasite from Brazil](https://www.patrickvoillot.com/wp-content/uploads/2021/03/montebrasite-ovale-bresil118.png)
montebrasite
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 “.