{"id":6295,"date":"2020-12-09T12:41:00","date_gmt":"2020-12-09T11:41:00","guid":{"rendered":"https:\/\/ssef.ch\/?p=6295"},"modified":"2022-11-02T15:23:35","modified_gmt":"2022-11-02T14:23:35","slug":"blue-cobalt-spinel-from-vietnam","status":"publish","type":"post","link":"https:\/\/www.ssef.ch\/fr\/blue-cobalt-spinel-from-vietnam\/","title":{"rendered":"Blue cobalt spinel from Vietnam"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/ssef.ch\/wp-content\/uploads\/2020\/12\/cospinel-1-1024x594.jpg\" alt=\"\" class=\"wp-image-6296\"\/><figcaption><em>Vivid blue cobalt-spinel from Vietnam (left) and blue cobalt-bearing spinel (right) showing a colour change from blue in daylight to purplish-blue in incandescent light. <\/em><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"> by Dr. M.S. Krzemnicki, first published in&nbsp;<a href=\"https:\/\/ssef.ch\/wp-content\/uploads\/2017\/12\/SSEF-FACETTE2014.pdf\">Facette 21<\/a> (February 2014) <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In 2013, Ms. Carina Hanser from the University Freiburg im Breisgau in Germany successfully completed her bachelor thesis on cobalt-spinel from Vietnam. Under the supervision of Dr Krzemnicki, Prof de Capitani (University Basel) and Prof Bucher (University Freiburg i. Br.) she investigated eight samples from Vietnam and three synthetic blue spinels (including a Verneuil-synthetic bluish spinel coloured by nickel). Apart from chemical and spectroscopic characterisation, she also used LA-ICP-mass spectrometry (University of Berne), UV-Vis spectrometry, confocal Raman microspectrometry, photoluminescence and UV- luminescence spectroscopy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We were especially interested to gain a better understanding of the slight to moderate colour change from blue in daylight to purplish blue and lavender colours in incandescent light which is observed in part of these samples.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"594\" src=\"https:\/\/ssef.ch\/wp-content\/uploads\/2020\/12\/cospinel-2-1024x594.jpg\" alt=\"\" class=\"wp-image-6299\" srcset=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/12\/cospinel-2-1024x594.jpg 1024w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/12\/cospinel-2-300x174.jpg 300w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/12\/cospinel-2-768x445.jpg 768w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/12\/cospinel-2-700x406.jpg 700w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/12\/cospinel-2.jpg 1100w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption><em>Absorption spectra of two vivid blue spinels (blue and purple traces) showing distinct Co- related absorption bands and a blue spinel showing a Co-dominated absorption spectrum (orange trace) superposed with small Fe-related peaks at 460 nm and 555 nm. \u00a9 C.S. Hanser, 2013 <\/em><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">As a result of this study, the natural blue spinels could be subdivided into two groups: a) vivid \u201celectric\u201d blue spinels and b) lighter bluish to purplish blue spinels with a slight colour change (Figure 1). The vivid blue spinels are characterised by a high concentration of cobalt (approx. 250 &#8211; 630 ppm) resulting in distinct cobalt-related absorption bands in the UV-Vis spectra (Figure 2) at approx. 623 nm, 597 nm, and 579 nm 544 nm and 480 nm (see also Shigley &amp; Stockton 1984), overlaying any iron-related absorption, even though they contain up to approx. 1.05 wt% FeO. These spinels show no colour change.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The natural blue spinels showing a\nslight colour change (group b) contain\nmuch less cobalt (5 to 20 ppm). Especially in combination with their distinct\niron concentration of approx. 0.7 to\n2.5 wt% FeO, their UV-Vis spectra are a complex combination\nof absorption bands due to cobalt and iron (Fe-related bands notably at 460 nm\nand 555 nm). Interestingly, only the colour-changing blue spinels react\nunder the SWUV light with a weak greenish fluorescence, also detected as an\nemission band at about 520 nm in the UV-luminescence spectra.\n\nTo conclude, this study contributes to the understanding of the causes of\ncolour in blue spinels, where cobalt at even very low concentrations (few ppm) may distinctly\ncontribute to their colour. An\narticle with detailed results is in preparation and will be published in 2014\n\n\n\n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>by Dr. M.S. Krzemnicki, first published in&nbsp;Facette 21 (February 2014) In 2013, Ms. Carina Hanser from the University Freiburg im Breisgau in Germany successfully completed her bachelor thesis on cobalt-spinel from Vietnam. Under the supervision of Dr Krzemnicki, Prof de Capitani (University Basel) and Prof Bucher (University Freiburg i. Br.) she investigated eight samples from [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":6296,"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":[741,733,735],"library_category":[],"library_author":[],"class_list":["post-6295","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-blog","tag-geochemistry","tag-origins","tag-spinel"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Blue cobalt spinel from Vietnam - 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\/blue-cobalt-spinel-from-vietnam\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Blue cobalt spinel from Vietnam - SSEF\" \/>\n<meta property=\"og:description\" content=\"by Dr. M.S. Krzemnicki, first published in&nbsp;Facette 21 (February 2014) In 2013, Ms. Carina Hanser from the University Freiburg im Breisgau in Germany successfully completed her bachelor thesis on cobalt-spinel from Vietnam. Under the supervision of Dr Krzemnicki, Prof de Capitani (University Basel) and Prof Bucher (University Freiburg i. Br.) she investigated eight samples from [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ssef.ch\/blue-cobalt-spinel-from-vietnam\/\" \/>\n<meta property=\"og:site_name\" content=\"SSEF\" \/>\n<meta property=\"article:published_time\" content=\"2020-12-09T11:41:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-11-02T14:23:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/12\/cospinel-1-jpg.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1100\" \/>\n\t<meta property=\"og:image:height\" content=\"638\" \/>\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=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Laurent Cartier\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/blue-cobalt-spinel-from-vietnam\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/blue-cobalt-spinel-from-vietnam\\\/\"},\"author\":{\"name\":\"Laurent Cartier\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/#\\\/schema\\\/person\\\/c855f01c061d2c7b29f823eaee439288\"},\"headline\":\"Blue cobalt spinel from Vietnam\",\"datePublished\":\"2020-12-09T11:41:00+00:00\",\"dateModified\":\"2022-11-02T14:23:35+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/blue-cobalt-spinel-from-vietnam\\\/\"},\"wordCount\":418,\"publisher\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/blue-cobalt-spinel-from-vietnam\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.ssef.ch\\\/wp-content\\\/uploads\\\/2020\\\/12\\\/cospinel-1-jpg.webp\",\"keywords\":[\"Geochemistry\",\"Origins\",\"Spinel\"],\"articleSection\":[\"Research Blog\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/blue-cobalt-spinel-from-vietnam\\\/\",\"url\":\"https:\\\/\\\/www.ssef.ch\\\/blue-cobalt-spinel-from-vietnam\\\/\",\"name\":\"Blue cobalt spinel from Vietnam - 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