{"id":47693,"date":"2026-04-21T06:30:54","date_gmt":"2026-04-21T04:30:54","guid":{"rendered":"https:\/\/www.ssef.ch\/?p=47693"},"modified":"2026-04-21T09:11:51","modified_gmt":"2026-04-21T07:11:51","slug":"rare-encounter-sapphire-with-grandidierite-needle-inclusion","status":"publish","type":"post","link":"https:\/\/www.ssef.ch\/zh-hant\/rare-encounter-sapphire-with-grandidierite-needle-inclusion\/","title":{"rendered":"Rare encounter: Sapphire with grandidierite needle inclusion"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"47693\" class=\"elementor elementor-47693\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7e59a34 e-flex e-con-boxed qodef-elementor-content-no e-con e-parent\" data-id=\"7e59a34\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-30c8b01 elementor-widget elementor-widget-text-editor\" data-id=\"30c8b01\" 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<strong>By Dr. Michael S. Krzemnicki, first published in <a href=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/02\/facette-2026-web.pdf\" target=\"_blank\" rel=\"noopener\">Facette 30<\/a> (March 2026)<\/strong>\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-f781946 elementor-widget elementor-widget-text-editor\" data-id=\"f781946\" 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\tRecently, the SSEF received for testing a sapphire of pale blue colour with a distinct colourless needle-like inclusion, resembling to some extent long prismatic pargasite needles known in Kashmir sapphires (Figure 1).\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-04fc55f elementor-widget elementor-widget-image\" data-id=\"04fc55f\" 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=\"1024\" height=\"521\" src=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/433_Fig_1.jpg\" class=\"attachment-large size-large wp-image-47701\" alt=\"\" srcset=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/433_Fig_1.jpg 1024w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/433_Fig_1-300x153.jpg 300w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/433_Fig_1-768x391.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 1: Pale blue Sri Lankan sapphire with colourless needles of grandidierite as inclusion. Microphoto: 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-e74e40a elementor-widget elementor-widget-text-editor\" data-id=\"e74e40a\" 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>When analysing this inclusion with Raman microspectroscopy (Figure 2), we were more than astonished to find out that the inclusion is grandidierite, a magnesium aluminium borosilicate with the ideal chemical formula (Mg,Fe<sup>2+<\/sup>)(Al,Fe<sup>3+<\/sup>)<sub>3<\/sub>(SiO<sub>4<\/sub>)(BO<sub>3<\/sub>)O<sub>2<\/sub>. It was first discovered in 1902 by Alfred Lacroix in southern Madagascar and named in honour of Alfred Grandidier (1836-1912), a French explorer and scholar who studied extensively the natural history of Madagascar.<\/p>\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-fbdf908 elementor-widget elementor-widget-image\" data-id=\"fbdf908\" 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=\"1024\" height=\"682\" src=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/Raman-spectra-of-a-faceted-grandidierite-compared-with-the-colourless-grandidierite-as-inclusion.jpg\" class=\"attachment-large size-large wp-image-47708\" alt=\"\" srcset=\"https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/Raman-spectra-of-a-faceted-grandidierite-compared-with-the-colourless-grandidierite-as-inclusion.jpg 1024w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/Raman-spectra-of-a-faceted-grandidierite-compared-with-the-colourless-grandidierite-as-inclusion-300x200.jpg 300w, https:\/\/www.ssef.ch\/wp-content\/uploads\/2026\/03\/Raman-spectra-of-a-faceted-grandidierite-compared-with-the-colourless-grandidierite-as-inclusion-768x512.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 2: Raman spectra of a faceted grandidierite compared with the colourless grandidierite as inclusion in the descried sapphire (the peaks with * are due to the sapphire). 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-06d9352 elementor-widget elementor-widget-text-editor\" data-id=\"06d9352\" 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>Gem-quality grandidierite is a very rare collectors\u2019 stone (see SSEF Facette 2018 and 2020) and usually exhibits bluish green to greenish blue colour of various saturation in relation to its iron concentration. In cases which present very low iron concentrations or the absence of iron, the mineral is colourless as in case of the needle-like inclusions in this sapphire.<\/p><p>In literature, only two similar cases of needle-like grandidierite inclusions in sapphire have been reported (Hain &amp; Hughes, 2019). Certainly, because this mineral inclusion is very rare, but probably also because these colourless needles may be misinterpreted (e.g. as pargasite) and their true nature \u2018overlooked\u2019 in sapphire testing. Based on our testing and data, this sapphire originated from Sri Lanka (a known source locality of grandidierite), Kashmir as an origin of the sapphire could be definitively excluded.<\/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\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Recently, the SSEF received for testing a sapphire of pale blue colour with a distinct colourless needle-like inclusion, resembling to some extent long prismatic pargasite needles known in Kashmir<br \/>\nsapphires.<\/p>\n","protected":false},"author":10,"featured_media":47695,"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":[726],"library_category":[],"library_author":[],"class_list":["post-47693","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-blog","tag-sapphire"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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