{"id":5474,"date":"2019-09-30T00:36:45","date_gmt":"2019-09-29T22:36:45","guid":{"rendered":"http:\/\/lartzoomeur.com\/bijoux\/?p=5474"},"modified":"2020-04-27T19:15:43","modified_gmt":"2020-04-27T23:15:43","slug":"quartz","status":"publish","type":"post","link":"https:\/\/canadianartworks.com\/fr\/quartz\/","title":{"rendered":"Quartz"},"content":{"rendered":"<div class=\"vc_row wpb_row vc_row-fluid et_custom_uniqid_69e50e651e6b5 mpc-row\"><div class=\"wpb_column vc_column_container vc_col-sm-6 et_custom_uniqid_69e50e651e68a mpc-column\" data-column-id=\"mpc_column-2569e50e67ed23d\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\">\n\t<div class=\"wpb_text_column wpb_content_element\">\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<p style=\"text-align: justify;\"><strong>Quartz<\/strong><\/p>\n<p style=\"text-align: justify;\">Le quartz est un min\u00e9ral compos\u00e9 d'atomes de silicium et d'oxyg\u00e8ne dans un r\u00e9seau continu de SiO<sub>4<\/sub> t\u00e9tra\u00e8dres silicium-oxyg\u00e8ne, chaque oxyg\u00e8ne \u00e9tant partag\u00e9 entre deux t\u00e9tra\u00e8dres, donnant une formule chimique globale de SiO<sub>2<\/sub>. Le quartz est le deuxi\u00e8me min\u00e9ral le plus abondant dans la cro\u00fbte continentale de la Terre, derri\u00e8re le feldspath.<\/p>\n<p style=\"text-align: justify;\">Le quartz existe sous deux formes, le quartz normal et le quartz \u03b2 \u00e0 haute temp\u00e9rature, tous deux chiraux. La transformation du quartz \u03b1 en quartz \u03b2 a lieu brusquement \u00e0 573 \u00b0 C (846 K). Comme la transformation s'accompagne d'un changement de volume important, elle peut facilement induire une fracturation de la c\u00e9ramique ou des roches franchissant ce seuil de temp\u00e9rature.<\/p>\n<p style=\"text-align: justify;\">Le mot \u00abquartz\u00bb est d\u00e9riv\u00e9 du mot allemand \u00abQuarz\u00bb, qui venait du mot polonais <i>kwardy<\/i>, qui correspond au terme tch\u00e8que <i>tvrd&yacute;<\/i> (\"dur\").<\/p>\n<p style=\"text-align: justify;\">Le quartz pur, appel\u00e9 traditionnellement cristal de roche ou cristal clair, est incolore et transparent ou translucide. Il a souvent \u00e9t\u00e9 utilis\u00e9 pour les sculptures en pierre dure, comme le cristal de Lothair. Les vari\u00e9t\u00e9s de couleurs courantes comprennent la citrine, le quartz rose, l'am\u00e9thyste, le quartz fum\u00e9, le quartz laiteux et autres.<\/p>\n<p style=\"text-align: justify;\">Les Grecs de l'Antiquit\u00e9 ont qualifi\u00e9 le quartz de &nbsp;<i>krustallos&nbsp;<\/i>d\u00e9riv\u00e9 du grec ancien <i>kruos<\/i>&nbsp;qui signifie \u00abfroid glacial\u00bb, car certains philosophes (y compris Th\u00e9ophraste) croyaient apparemment que le min\u00e9ral \u00e9tait une forme de glace en surfusion.&nbsp;<sup id=\"cite_ref-Tomkieff_10-0\" class=\"reference\"><\/sup>Aujourd'hui, le terme <i>cristal de roche<\/i> est parfois utilis\u00e9 comme un nom alternatif pour la forme la plus pure du quartz.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><div class=\"wpb_column vc_column_container vc_col-sm-6 et_custom_uniqid_69e50e651e68a mpc-column\" data-column-id=\"mpc_column-6269e50e67edbda\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\">\n\t<div class=\"wpb_single_image wpb_content_element vc_align_center\">\n\t\t\n\t\t<figure class=\"wpb_wrapper vc_figure\">\n\t\t\t<div class=\"vc_single_image-wrapper   vc_box_border_grey\"><img decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/quartz-1024x1024.jpg\" class=\"vc_single_image-img attachment-large\" alt=\"\" srcset=\"https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/quartz-1024x1024.jpg 1024w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/quartz-150x150.jpg 150w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/quartz-300x300.jpg 300w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/quartz-768x768.jpg 768w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/quartz-600x600.jpg 600w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/quartz-400x400.jpg 400w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/quartz-100x100.jpg 100w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/quartz.jpg 1539w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><\/div>\n\t\t<\/figure>\n\t<\/div>\n<\/div><\/div><\/div><\/div><div class=\"vc_row wpb_row vc_row-fluid et_custom_uniqid_69e50e651e6b5 mpc-row\"><div class=\"wpb_column vc_column_container vc_col-sm-12 vc_col-has-fill et_custom_uniqid_69e50e651e68a mpc-column\" data-column-id=\"mpc_column-5569e50e67ee1e8\"><div class=\"vc_column-inner vc_custom_1569797106857\"><div class=\"wpb_wrapper\">\n\t<div class=\"wpb_text_column wpb_content_element\">\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<h4 style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"caret-color: #000000;\">Risques pour la sant\u00e9<\/span><\/span><\/h4>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Le quartz est g\u00e9n\u00e9ralement inoffensif, sauf s'il est bris\u00e9 ou r\u00e9duit en poudre. Les cristaux cass\u00e9s peuvent avoir des bords aussi tranchants qu'une lame de rasoir et peuvent facilement couper la chair. Il faut donc les manipuler avec soin. Ne pas meuler \u00e0 sec, car une exposition prolong\u00e9e \u00e0 de la poudre finement broy\u00e9e peut provoquer la silicose.<\/span><\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div><div class=\"vc_row wpb_row vc_row-fluid et_custom_uniqid_69e50e651e6b5 mpc-row\"><div class=\"wpb_column vc_column_container vc_col-sm-12 et_custom_uniqid_69e50e651e68a mpc-column\" data-column-id=\"mpc_column-1369e50e680515a\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\">        <link rel=\"stylesheet\" href=\"https:\/\/canadianartworks.com\/wp-content\/themes\/xstore\/css\/modules\/woocommerce\/global.min.css?ver=1.0\" type=\"text\/css\" media=\"all\"> \t\t        <link rel=\"stylesheet\" href=\"https:\/\/canadianartworks.com\/wp-content\/themes\/xstore\/css\/modules\/woocommerce\/archive.min.css?ver=1.0\" type=\"text\/css\" media=\"all\"> \t\t        <link rel=\"stylesheet\" 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