Strange synthetic cristalisation / formation of Silizium has 99.999% pur - 西洋鏡 quality as you can see on all pictures
Curiosity: very big Kerkoub Formation (spherulitic sandstone) formed by calcifying bacteria(688gr) - 西洋鏡
Museum Fabulous quality and crystal-clear transparency in Brazilian quartz - 17 cm - 西洋鏡 quality as you can see on all pictures
South America spider - Mygales Collection (39x26 cm) - - 西洋鏡 come from French Auction with expert - 1970-1980
Curiosity : French large book on home medicine - with many colored illustrations - 1928 - 西洋鏡 - 1990-2000