sogdianite
ck_admin
March 24, 2021
Discovered in 1968 in Tajikistan, it owes its name to Sogdiana, who is the former name of this Central Asian region.
silicates
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
sodalite
ck_admin
March 24, 2021
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 In its formula sulfur has been replaced by chlorine, and has an amazing
sillimanite
ck_admin
March 24, 2021
Discovered in 1824, it honors the name of the American geologist Benjamin Silliman (1779-1864). It is also known for its blue or violet variety called fibrolite. It has been known since prehistoric times and it was used to manufacture cutting tools. There is also a
serpentine
ck_admin
March 24, 2021
Serpentine, or rather the serpentines, is a group of over 20 minerals quite difficult to differentiate the one from the other, the best known of whom are : antigorite, chrysotile and lizardite. These Phyllosilicates are weathering products of magnesium silicates. The Ophite, sometimes called “ophite
serendibite
ck_admin
March 24, 2021
Discovered in Sri Lanka in 1902, its name comes from “Serendib” the name of Sri Lanka in Arabic. Usually of a color without interest or very dark brown, there is anyways a variety of a beautiful light blue color.
