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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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ulexite
ck_admin
March 24, 2021
Named in honor of the German chemist George Ulex (1811-1883). We notice a rare property: if the ends of a thick plate are well polished perpendicular to the longitudinal direction of its crystal fibers, they behave like optical fibers. A Printed text placed below appears
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