{"id":38189,"date":"2024-06-06T12:16:51","date_gmt":"2024-06-06T10:16:51","guid":{"rendered":"https:\/\/ssef.ch\/?p=38189"},"modified":"2024-06-10T17:36:24","modified_gmt":"2024-06-10T15:36:24","slug":"afghanite-from-badakhshan-in-afghanistan","status":"publish","type":"post","link":"https:\/\/www.ssef.ch\/zh-hans\/afghanite-from-badakhshan-in-afghanistan\/","title":{"rendered":"Afghanite from Badakhshan in Afghanistan"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"38189\" class=\"elementor elementor-38189\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4ae10602 elementor-section-boxed elementor-section-height-default elementor-section-height-default qodef-backgound-letter-holder-no qodef-elementor-content-no\" data-id=\"4ae10602\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-112861b6\" data-id=\"112861b6\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8193a95 elementor-widget elementor-widget-text-editor\" data-id=\"8193a95\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>By Dr. M.S. Krzemnicki, first published in <a href=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2024\/05\/facette-2024-web.pdf\" target=\"_blank\" rel=\"noopener\">Facette 29<\/a> (May 2024)<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-9e6d368 elementor-section-boxed elementor-section-height-default elementor-section-height-default qodef-backgound-letter-holder-no qodef-elementor-content-no\" data-id=\"9e6d368\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ff43db1\" data-id=\"ff43db1\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-87190b2 elementor-widget elementor-widget-image\" data-id=\"87190b2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"669\" src=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2024\/06\/313_Fig_1_afghanite-jpg.webp\" class=\"attachment-large size-large wp-image-38193\" alt=\"\" srcset=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2024\/06\/313_Fig_1_afghanite-jpg.webp 1000w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2024\/06\/313_Fig_1_afghanite-300x201.webp 300w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2024\/06\/313_Fig_1_afghanite-768x514.webp 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 1: Rough and faceted afghanite samples recently submitted to SSEF. The faceted afghanite samples range in weight from 0.2 ct to 4.2 ct, all are characterized by an attractive colour and exceptional clarity. Photo: J. Xaysongkham, SSEF.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a521df8 elementor-widget elementor-widget-text-editor\" data-id=\"a521df8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"page\" title=\"Page 27\"><div class=\"layoutArea\"><div class=\"column\"><p>Afghanistan is known since ancient times as source of exceptional gems, namely lapis lazuli, tourmalines, beryls, rubies and spinel (Bowersox &amp; Chamberlin 1995). Apart from these rather classic gemstones, Afghanistan is also source for numerous rare collector minerals, such as va\u0308yrynenite, triplite, bastna\u0308site, purple diaspore, sodalite and its tenebrescent variety hackmanite, to name a few (see for example SSEF Facette 2023, page 38).<\/p><p>One of these rare collector stones is afghanite, a complex hydrated silicate, first discovered and described in 1968 from the famous lapis lazuli occurrence of Sar-e-Sang in the Badakshan Province in northeastern Afghanistan (Bariand et al. 1968). Forming whitish to dark blue trigonal crystals, only a small amount of this material is of gem quality and as a consequence faceted afghanite has only been reported in small quantity and sizes over the years.<\/p><p>Recently, the Swiss Gemmological Institute SSEF received an outstanding series of faceted afghanites from Sar-e-Sang together with a larger parcel of rough stones (see Figure 1). These stones were characterized by an attractive colour and exceptional clarity and remarkable size (up to 4.2 ct), thus more than double the size of the largest faceted afghanite of 1.91 ct described so far in literature (McBride, 2018).<\/p><p>Classic and advanced testing of this material revealed its uniaxial positive optical character, a RI of 1.520 to 1.530, with a birefringence of +0.006, and a distinct pleochroism from nearly colourless to blue, all findings well in line with reported afghanite data from literature. Under a longwave ultraviolet lamp (LWUV) all our samples showed a characteristic strong orange fluorescence reaction whereas the reaction in shortwave ultraviolet (SWUV) was weaker and more reddish orange (Figure 2). No tenebrescence (reversible colour shift) was observed in all our samples. Chemical analyses (EDXRF), FTIR, Raman, and UV-Vis absorption spectroscopy further confirmed the identity of our samples as afghanite of exceptional colour and transparency.<\/p><div class=\"page\" title=\"Page 27\"><div class=\"layoutArea\"><div class=\"column\"><p>A gemmological short note about this material is published in the coming issue of the Journal of Gemmology (Vol. 39, No. 1).<\/p><\/div><\/div><\/div><\/div><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a539f86 elementor-widget elementor-widget-image\" data-id=\"a539f86\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1000\" height=\"290\" src=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2024\/06\/313_Fig_2_UV-reaction-jpg.webp\" class=\"attachment-large size-large wp-image-38199\" alt=\"\" srcset=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2024\/06\/313_Fig_2_UV-reaction-jpg.webp 1000w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2024\/06\/313_Fig_2_UV-reaction-300x87.webp 300w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2024\/06\/313_Fig_2_UV-reaction-768x223.webp 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 2: Afghanite with distinct dichroism and typical reactions under longwave and shortwave ultraviolet light. Figure: M.S. Krzemnicki, SSEF.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e8ab3ff elementor-widget elementor-widget-text-editor\" data-id=\"e8ab3ff\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>References<\/strong><\/p><p>Bariand P., Cesbron F., Giraud R., 1968. Une nouvelle espe\u0300ce mine\u0301rale: L\u2019afghanite de Sar-e-sang, Badakhshan, Afghanistan: Comparaison avec les mine\u0301raux du groupe de la cancrinite. Bulletin de la Socie\u0301te\u0301 Francaise de Mine\u0301ralogie et Cristallographie 91:34-42.<br \/>Bowersox , G.W., Chamberlin, B.E., 1995. Gemstones of Afghanistan. Geoscience Press, Tucson, USA, 280pp.<br \/>McBride H., 2018. Large faceted afghanite. Gems &amp; Gemology, 54 (2), 206.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Afghanistan is known since ancient times as source of exceptional gems, namely lapis lazuli, tourmalines, beryls, rubies and spinel (Bowersox &#038; Chamberlin 1995). Apart from these rather classic gemstones, Afghanistan is also source for numerous rare collector minerals, such as va\u0308yrynenite, triplite, bastna\u0308site, purple diaspore, sodalite and its tenebrescent variety hackmanite, to name a few.<\/p>\n","protected":false},"author":3,"featured_media":38207,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[626],"tags":[736],"library_category":[],"library_author":[],"class_list":["post-38189","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-blog","tag-othergemstones"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Afghanite from Badakhshan in Afghanistan - SSEF<\/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.ssef.ch\/fr\/afghanite-from-badakhshan-in-afghanistan\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Afghanite from Badakhshan in Afghanistan - SSEF\" \/>\n<meta property=\"og:description\" content=\"Afghanistan is known since ancient times as source of exceptional gems, namely lapis lazuli, tourmalines, beryls, rubies and spinel (Bowersox &amp; Chamberlin 1995). Apart from these rather classic gemstones, Afghanistan is also source for numerous rare collector minerals, such as va\u0308yrynenite, triplite, bastna\u0308site, purple diaspore, sodalite and its tenebrescent variety hackmanite, to name a few.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ssef.ch\/fr\/afghanite-from-badakhshan-in-afghanistan\/\" \/>\n<meta property=\"og:site_name\" content=\"SSEF\" \/>\n<meta property=\"article:published_time\" content=\"2024-06-06T10:16:51+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-06-10T15:36:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2024\/06\/Afghanite-from-Badakhshan-in-Afghanistan-jpg.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"600\" \/>\n\t<meta property=\"og:image:height\" content=\"338\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Laurent Cartier\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"Laurent Cartier\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/fr\\\/afghanite-from-badakhshan-in-afghanistan\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/fr\\\/afghanite-from-badakhshan-in-afghanistan\\\/\"},\"author\":{\"name\":\"Laurent Cartier\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/#\\\/schema\\\/person\\\/c855f01c061d2c7b29f823eaee439288\"},\"headline\":\"Afghanite from Badakhshan in Afghanistan\",\"datePublished\":\"2024-06-06T10:16:51+00:00\",\"dateModified\":\"2024-06-10T15:36:24+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/fr\\\/afghanite-from-badakhshan-in-afghanistan\\\/\"},\"wordCount\":451,\"publisher\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/fr\\\/afghanite-from-badakhshan-in-afghanistan\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.ssef.ch\\\/wp-content\\\/uploads\\\/2024\\\/06\\\/Afghanite-from-Badakhshan-in-Afghanistan-jpg.webp\",\"keywords\":[\"Other Gemstones\"],\"articleSection\":[\"Research Blog\"],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/fr\\\/afghanite-from-badakhshan-in-afghanistan\\\/\",\"url\":\"https:\\\/\\\/www.ssef.ch\\\/fr\\\/afghanite-from-badakhshan-in-afghanistan\\\/\",\"name\":\"Afghanite from Badakhshan in Afghanistan - 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