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 …

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thorite round cut

thorite

Discovered in 1829, its name comes from its composition rich in thorium. It is highly radioactive and only since a short time. there are interesting samples for gemology.

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tanzanite from Tanzania rectangular cut

tanzanite

This is the blue variety of zoisite. It would have been known since 1954, but it was in 1967 that Manuel de Souza “discovered” this gem by chance, in Arusha, Tanzania. Soon there were talks in the media about the “blue treasure of Africa”, referring

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crystallized talc from Luzenac in Arriege in France

talc

Its name comes from Arabic or Persian “Talq” which means pure, probably because of its powder. It has been known since antiquity. The light green soapstone (steatite) has been confused with jade, but it has not its hardness. This is number 1 in the standard

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sugilite from Wessels Mine, Kalahari in South Africa, cabochon cut

sugilite

It was discovered in 1944 in Japan, its name honors the Japanese geologist Ken-ichi Sugi (1901-1948) who has identified it. But it was not until the late 1970s that a purple manganiferous variety from South Africa has been used in jewelry. There is also another

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staurolite from Brazil oval cut

staurolite

It is named after his twins very frequently cross-shaped: the twin cross of St. Andrew (60 degrees) and that of the Greek cross (90 degrees), in Greek “stauros” means cross and “lithos”, stone, hence its name “cross stone”. Another twin “in wheel”shape exists in the

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spessartine mandarine garnet oval cut

spessartine

Its name comes from the cottage of Spessar sur- le -Main in Bavaria. The finest ones come from Africa, in Namibia, from a recently discovered deposit that produced the famous “tangerine”garnets, of a very bright color and a beautiful shine, and that seems exhausted. The

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