{"id":6240,"date":"2021-02-04T14:20:00","date_gmt":"2021-02-04T13:20:00","guid":{"rendered":"https:\/\/ssef.ch\/?p=6240"},"modified":"2022-11-02T15:21:16","modified_gmt":"2022-11-02T14:21:16","slug":"rare-earth-elements-in-danburites","status":"publish","type":"post","link":"https:\/\/www.ssef.ch\/fr\/rare-earth-elements-in-danburites\/","title":{"rendered":"Rare Earth Elements in Danburites"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/ssef.ch\/wp-content\/uploads\/2020\/11\/420_1_danburite-REE-b-1024x482.jpg\" alt=\"\" class=\"wp-image-6241\"\/><figcaption>Figure 1: Part of the studied danburites for this research project. Photo: M. S. Krzemnicki, SSEF<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The calcium-boron-silicate danburite is a rather rare collector\u2019s stone, mainly known in colourless to slightly yellowish to brownish colours from a limited number of deposits worldwide. Since 2013, new and attractive vivid yellow danburite has entered the gem trade. This new material originates from the Manyara region in northern Tanzania and has been cut in gems up to 18 ct.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As part of a research collaboration with Christopher Smith from the American Gemological Laboratories AGL, we have analysed a selected number of Tanzanian danburites with LA-ICP-MS to get detailed data about their trace element content, and compared these with samples from Mogok in Burma (Myanmar) (Figure 1).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Calcium-bearing silicates often contain a wide range of trace elements, notably rare earth elements (REE), which substitute for calcium. Due to the fact that REE with even atomic numbers are more abundant than the odd numbered neighbours (so-called Oddo-Harkins rule), they are often displayed in a diagram normalized to a chondrite standard (stone-meteorite).<br> Plotting our REE data in a chondrite normalized diagram (Figure 2) revealed a trend of the lighter REE (La, Ce, Pr, Nd, Sm) being enriched in the danburites from both Tanzania and Myanmar. In contrast to this, the analysed danburites from Tanzania contained a significantly higher amount of heavy REE (Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y) compared to the Burmese samples. This trace and ultra-trace element pattern may help to distinguish the origin of such danburites in future. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">More detailed articles on this research can be found <a href=\"https:\/\/ssef.ch\/library_tag\/danburite\/\">here<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"482\" src=\"https:\/\/ssef.ch\/wp-content\/uploads\/2020\/11\/420_2_danburite-REE-b-1024x482.jpg\" alt=\"\" class=\"wp-image-6244\" srcset=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/11\/420_2_danburite-REE-b-1024x482.jpg 1024w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/11\/420_2_danburite-REE-b-300x141.jpg 300w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/11\/420_2_danburite-REE-b-768x362.jpg 768w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/11\/420_2_danburite-REE-b-700x330.jpg 700w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/11\/420_2_danburite-REE-b.jpg 1100w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption>Figure 2: Chondrite normalized REE diagram of the analysed danburites. Note the logarithmic scale of the vertical concentration axis. Diagram: M. S. Krzemnicki, SSEF<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>The calcium-boron-silicate danburite is a rather rare collector\u2019s stone, mainly known in colourless to slightly yellowish to brownish colours from a limited number of deposits worldwide. Since 2013, new and attractive vivid yellow danburite has entered the gem trade. This new material originates from the Manyara region in northern Tanzania and has been cut in [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":6241,"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":[741,736],"library_category":[],"library_author":[],"class_list":["post-6240","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-blog","tag-geochemistry","tag-othergemstones"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rare Earth Elements in Danburites - 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\/zh-hans\/rare-earth-elements-in-danburites\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Rare Earth Elements in Danburites - SSEF\" \/>\n<meta property=\"og:description\" content=\"The calcium-boron-silicate danburite is a rather rare collector\u2019s stone, mainly known in colourless to slightly yellowish to brownish colours from a limited number of deposits worldwide. Since 2013, new and attractive vivid yellow danburite has entered the gem trade. This new material originates from the Manyara region in northern Tanzania and has been cut in [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ssef.ch\/zh-hans\/rare-earth-elements-in-danburites\/\" \/>\n<meta property=\"og:site_name\" content=\"SSEF\" \/>\n<meta property=\"article:published_time\" content=\"2021-02-04T13:20:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-11-02T14:21:16+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2020\/11\/420_1_danburite-REE-b-jpg.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1100\" \/>\n\t<meta property=\"og:image:height\" content=\"518\" \/>\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=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/rare-earth-elements-in-danburites\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/rare-earth-elements-in-danburites\\\/\"},\"author\":{\"name\":\"Laurent Cartier\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/#\\\/schema\\\/person\\\/c855f01c061d2c7b29f823eaee439288\"},\"headline\":\"Rare Earth Elements in Danburites\",\"datePublished\":\"2021-02-04T13:20:00+00:00\",\"dateModified\":\"2022-11-02T14:21:16+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/rare-earth-elements-in-danburites\\\/\"},\"wordCount\":292,\"publisher\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/rare-earth-elements-in-danburites\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.ssef.ch\\\/wp-content\\\/uploads\\\/2020\\\/11\\\/420_1_danburite-REE-b-jpg.webp\",\"keywords\":[\"Geochemistry\",\"Other Gemstones\"],\"articleSection\":[\"Research Blog\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/rare-earth-elements-in-danburites\\\/\",\"url\":\"https:\\\/\\\/www.ssef.ch\\\/zh-hans\\\/rare-earth-elements-in-danburites\\\/\",\"name\":\"Rare Earth Elements in Danburites - 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