Guide des pierres précieuses, 6e édition by Walter Schumann
Guide des pierres précieuses, 6e édition by Walter Schumann PDF, ePub eBook D0wnl0ad
Grenats, émeraude, kunzite, ambre, agates, opales, perles, rubis... et des centaines d'autres pierres précieuses, fines et ornementales, forment le captivant sujet de ce livre, le best-seller des classiques. Les 100 premières pages sont une introduction à la gemmologie : propriétés, gisements et extraction, traitements, synthèses et imitations, classification minéralogique. Le reste de l'ouvrage est un inventaire et une description accompagnés de photographies de ces gemmes : cristallochimie, propriétés optiques (couleurs, feux, fluorescence, etc.), propriétés mécaniques (densité, dureté, clivage, etc.). Plus de 1 500 documents en couleurs reproduisent fidèlement ces gemmes, d'une part taillée, d'autre part à l'état brut pour les plus courantes. Bibliographie, tableau comparatif, index... font de ce livre un ouvrage de référence. - Pour tous les amateurs de pierres fines, collectionneurs et naturalistes.- La plus importante galerie gemmologique de poche : 350 gemmes et variétés répertoriés, 1 500 échantillons photographiés.- Tous les éléments réunis pour aider à l’authentification des gemmes et de leurs substituts.From reader reviews:
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