![yellow zircon of Sri Lanka brilliant cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/zircon-taille-diamant-sri-lanka19.png)
conchoidal
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 …
actualités
Categories
![yellow zircon of Sri Lanka brilliant cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/zircon-taille-diamant-sri-lanka19.png)
![natural crystallized zincite from Franklin, United States](https://www.patrickvoillot.com/wp-content/uploads/2021/03/zincite-franklin-etats-unis21.png)
![yugawaralite emerald cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/yugawaralite-taille-emeraude22.png)
![wulfenite from U.S. square cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/wulfenite-taille-carree-usa32.png)
![emerald cut willemite](https://www.patrickvoillot.com/wp-content/uploads/2021/03/willemite-taille-emeraude25.png)
![whewellite fancy cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/whewellite-taille-fantaisie26.png)
whewellite
ck_admin
March 24, 2021
It honors the name of the English mineralogist William Whewell (1794-1866). It is a component of kidney stones. The fine twinned crystals result from the reaction of the urine of horses working in the mines with the host rock.