![sunstone form India](https://www.patrickvoillot.com/wp-content/uploads/2021/03/feldspath-aventurine-pierre-de-soleil-inde103.png)
feldspars
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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![sunstone form India](https://www.patrickvoillot.com/wp-content/uploads/2021/03/feldspath-aventurine-pierre-de-soleil-inde103.png)
![moonstone from Sri Lanka cut in cabochon](https://www.patrickvoillot.com/wp-content/uploads/2021/03/pierre-de-lune-cabochon-sri-lanka94.png)
moonstone
The moonstone is composed of alkaline feldspar, mainly potassium in other words orthoclase, in its variety “adularia”. This is actually a microperthite resulting from a microscopic phase separation of platelets from a sodium feldspar, the albite, in the orthoclase during the cooling of the mixture
![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.
![labradorite crystal from Finland with the phenomenon of blue labradorescence](https://www.patrickvoillot.com/wp-content/uploads/2021/03/labradorite-cristal-labradorescence141.png)
labradorite
This plagioclase was discovered in 1770 in the Labrador region in Canada, which gave it its name. It is part of the albite-anorthite series. Its characteristic is a set of iridescent colors that can be observed by changing its position relatively to the light, this
![fancy cut hyalophane from Bosnia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/hyalophane-taille-fantaisie153.png)
hyalophane
Discovered in 1855, it owes its name to the Greek “hyalos” – glass-, and “Phanos” – which has the appearance.
![yellow bytownite from Mexico, oval cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/bytownite-mexique225.png)