{"id":5378,"date":"2019-09-29T21:23:00","date_gmt":"2019-09-29T19:23:00","guid":{"rendered":"http:\/\/lartzoomeur.com\/bijoux\/?p=5378"},"modified":"2020-04-27T19:06:56","modified_gmt":"2020-04-27T23:06:56","slug":"labradorite","status":"publish","type":"post","link":"https:\/\/canadianartworks.com\/fr\/labradorite\/","title":{"rendered":"Labradorite"},"content":{"rendered":"<div class=\"vc_row wpb_row vc_row-fluid et_custom_uniqid_6a292fd09f148 mpc-row\"><div class=\"wpb_column vc_column_container vc_col-sm-6 et_custom_uniqid_6a292fd09f111 mpc-column\" data-column-id=\"mpc_column-446a292fd372e0b\"><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>Labradorite<\/strong><\/p>\n<p style=\"text-align: justify;\">La labradorite est un min\u00e9ral de feldspath et est un calcite interm\u00e9diaire de la s\u00e9rie des plagioclases. Les traits sont blancs, comme la plupart des silicates. Comme avec tous les membres du plagioclase, le syst\u00e8me cristallin est triclinique, et trois directions de clivage sont pr\u00e9sentes, dont deux presque perpendiculaires et plus \u00e9videntes, de bonne \u00e0 parfaite qualit\u00e9. Il se pr\u00e9sente sous forme de grains clairs, blancs \u00e0 gris, en forme de blocs ou \u00e0 la forme, dans les roches ign\u00e9es mafiques communes telles que le basalte et le gabbro, ainsi que dans les anorthosites.<\/p>\n<p style=\"text-align: justify;\">Sa formule est:  ((Ca, Na)(Al, Si)<sub>4<\/sub>O<sub>8<\/sub>)<\/p>\n<p style=\"text-align: justify;\">La zone de type g\u00e9ologique de la labradorite est l\u2019\u00eele de Paul, situ\u00e9e pr\u00e8s de la ville de Nain au Labrador, au Canada. Il a \u00e9galement \u00e9t\u00e9 signal\u00e9 en Norv\u00e8ge, en Finlande et dans divers autres endroits dans le monde.<\/p>\n<p style=\"text-align: justify;\">La labradorite peut afficher un effet optique iris\u00e9 (ou <i>schiller<\/i>) appel\u00e9 labradorescence.<\/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_6a292fd09f111 mpc-column\" data-column-id=\"mpc_column-996a292fd3736f8\"><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\/labradorite-1024x1024.jpg\" class=\"vc_single_image-img attachment-large\" alt=\"\" srcset=\"https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/labradorite-1024x1024.jpg 1024w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/labradorite-150x150.jpg 150w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/labradorite-300x300.jpg 300w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/labradorite-768x768.jpg 768w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/labradorite-600x600.jpg 600w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/labradorite-400x400.jpg 400w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/labradorite-100x100.jpg 100w, https:\/\/canadianartworks.com\/wp-content\/uploads\/2019\/09\/labradorite.jpg 1600w\" 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_6a292fd09f148 mpc-row\"><div class=\"wpb_column vc_column_container vc_col-sm-12 vc_col-has-fill et_custom_uniqid_6a292fd09f111 mpc-column\" data-column-id=\"mpc_column-436a292fd373cab\"><div class=\"vc_column-inner vc_custom_1569788322666\"><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;\">Irisation, labradorescence et spectrolite<\/span><\/h4>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">L'irisation (\u00e9galement appel\u00e9e goniochromisme) est le ph\u00e9nom\u00e8ne de certaines surfaces qui semblent changer progressivement de couleur \u00e0 mesure que l'angle de vue ou l'angle d'\u00e9clairage change. Les bulles de savon, les plumes, les ailes de papillon et les coquillages, ainsi que certains min\u00e9raux sont des exemples d\u2019irisation. Il est souvent cr\u00e9\u00e9 par une coloration structurelle (des microstructures qui interf\u00e8rent avec la lumi\u00e8re).<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Certaines vari\u00e9t\u00e9s de labradorite pr\u00e9sentant un degr\u00e9 \u00e9lev\u00e9 de labradorescence sont appel\u00e9es spectrolite.<\/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_6a292fd09f148 mpc-row\"><div class=\"wpb_column vc_column_container vc_col-sm-6 et_custom_uniqid_6a292fd09f111 mpc-column\" data-column-id=\"mpc_column-86a292fd374064\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><\/div><\/div><\/div><div class=\"wpb_column vc_column_container vc_col-sm-6 et_custom_uniqid_6a292fd09f111 mpc-column\" data-column-id=\"mpc_column-826a292fd3741d7\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><\/div><\/div><\/div><\/div><div class=\"vc_row wpb_row vc_row-fluid 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