{"id":90959,"date":"2026-06-19T16:31:29","date_gmt":"2026-06-19T14:31:29","guid":{"rendered":"https:\/\/www.librairieclavreuil.com\/hauy-abbe-rene-just-traite-des-caracteres-physiques-des-pierres-precieuses-pour-servir-a-leur-determination-lorsquelles-ont-ete-taillees\/"},"modified":"2026-06-19T16:31:34","modified_gmt":"2026-06-19T14:31:34","slug":"hauy-abbe-rene-just-traite-des-caracteres-physiques-des-pierres-precieuses-pour-servir-a-leur-determination-lorsquelles-ont-ete-taillees","status":"publish","type":"product","link":"https:\/\/www.librairieclavreuil.com\/en\/hauy-abbe-rene-just-traite-des-caracteres-physiques-des-pierres-precieuses-pour-servir-a-leur-determination-lorsquelles-ont-ete-taillees\/","title":{"rendered":"HA\u00dcY abb\u00e9 Ren\u00e9-Just Trait\u00e9 des caract\u00e8res physiques des..."},"content":{"rendered":"<p style=\"text-align:justify\"><i>DSB VI.178-183 &#8211; Sotheran, Ier supp. 4766; Wheatland 111 ; Sinkankas, I, 2811.<\/i><\/p>\n<p style=\"text-align:justify\"><span style=\"font-variant:small-caps\">First edition.<\/span><\/p>\n<p style=\"text-align:justify\">In this work, Ha\u00fcy sets out a method for identifying gemstones even when they have been faceted, that is to say, when their natural crystalline form is no longer directly visible. To do so, he draws on the physical and crystallographic properties of minerals.<br \/>He considers that each mineral species possesses not only a geometric structure but also specific properties.<\/p>\n<p style=\"text-align:justify\">He classifies the gemstones in a table, where they are divided by colour; Ha\u00fcy then details their reaction to light, specific gravity, hardness, refraction, and their response to electricity and a magnet.<\/p>\n<p style=\"text-align:justify\">&#8220;A work of fundamental importance in the science of gemology and marking the transition from a purely descriptive method to accurate determination of properties and applying them to identification&#8221; (Sinkankas).<\/p>\n<p style=\"text-align:justify\">The three plates by Cloquet depict stones and instruments, notably Nicholson\u2019s hydrometer.<\/p>\n<p style=\"text-align:justify\">Foxing<\/p>\n<p style=\"text-align:justify\">Provenance: Fran\u00e7ois Chr\u00e9tien (bookplate)<\/p>\n","protected":false},"excerpt":{"rendered":"<p style=\"text-align:justify\">8vo (211 x 126 mm) XVI pp., XXII pp., 233 pp., 3 fold-out plates. Half-morocco, flat spine, covers rubbed (<i>contemporary binding<\/i>).<\/p>\n","protected":false},"featured_media":90948,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[550],"product_tag":[1450,1332,554],"class_list":{"0":"post-90959","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-science","7":"product_tag-first-edition","8":"product_tag-general-mineralogy","9":"product_tag-mineralogy","10":"pa_auteur-hauy-abbe-rene-just-2","11":"pa_type-de-livre-printed-book","13":"first","14":"instock","15":"shipping-taxable","16":"purchasable","17":"product-type-simple"},"acf":{"artist":" abb\u00e9 Ren\u00e9-Just HA\u00dcY","chapeau":"","adresse_bibliographique":"Paris, veuve Courcier, 1817","book_type":"Printed book","provenance":"","afficher_prix":"oui"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>HA\u00dcY abb\u00e9 Ren\u00e9-Just Trait\u00e9 des caract\u00e8res physiques des pierres pr\u00e9cieuses pour servir \u00e0 leur d\u00e9termination lorsqu&#039;elles ont \u00e9t\u00e9 taill\u00e9es. - Libairie Clavreuil<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.librairieclavreuil.com\/en\/hauy-abbe-rene-just-traite-des-caracteres-physiques-des-pierres-precieuses-pour-servir-a-leur-determination-lorsquelles-ont-ete-taillees\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HA\u00dcY abb\u00e9 Ren\u00e9-Just Trait\u00e9 des caract\u00e8res physiques des pierres pr\u00e9cieuses pour servir \u00e0 leur d\u00e9termination lorsqu&#039;elles ont \u00e9t\u00e9 taill\u00e9es. - Libairie Clavreuil\" \/>\n<meta property=\"og:description\" content=\"8vo (211 x 126 mm) XVI pp., XXII pp., 233 pp., 3 fold-out plates. 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