{"id":8060,"date":"2018-12-02T10:12:05","date_gmt":"2018-12-02T08:12:05","guid":{"rendered":"https:\/\/www.caraa.fr\/les-roches-2\/"},"modified":"2022-07-11T12:20:11","modified_gmt":"2022-07-11T10:20:11","slug":"rocks","status":"publish","type":"post","link":"https:\/\/www.caraa.fr\/en\/rocks\/","title":{"rendered":"Stones and Rocks"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column width=&#8221;2\/3&#8243;][vc_column_text]<\/p>\n<h5>Semi-precious stones, as well as rocks belong to the mineral world. Again, the role of CARAA is to determine the most efficient methods to scan an object according to its value, size, conservation state and, the sampling opportunities &#8230; or the non-invasive possibilities.<\/h5>\n<ul>\n<li><b>Choosing the appropriate techniques<\/b><\/li>\n<\/ul>\n<p>Understanding a gem or a mineral might be complex. It is indeed rare that a single technique allows to identify all the problems related to a mineral. For example: what is the cause of the yellow colour in a diamond? is it natural or due to irradiation or heating induced by man? What kind of inclusions does it contain?<\/p>\n<ul>\n<li><b>A role of expertise at CARAA<\/b><\/li>\n<\/ul>\n<p>Confirming or infirming the composition of a rock or a crystal consist in authenticating it. Some common examples are the differentiation between diamond and its substitutes (zircon -ZrO2- or moissanite -SiC-), an amethyst from a coloured glass or, a crystal rock (quartz) from a glass (see the image of the Aztec crystal rock skull below).<\/p>\n<ul>\n<li><b>Identifying sources and provenance<\/b><\/li>\n<\/ul>\n<p>The geographical source of a gemstone or a mineral can be determined by analyzing the natural inclusions embedded in it during its geological formation. The geographical location of many types of marble is another example of potential source analysis.[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/3&#8243;][vc_column_text css=&#8221;.vc_custom_1656596531375{margin-bottom: 80px !important;}&#8221;]<\/p>\n<p>ngg_shortcode_0_placeholder[\/vc_column_text]<style type=\"text\/css\" data-type=\"the7_shortcodes-inline-css\">.blog-shortcode.blog-list-shortcode-id-99380b8528d31e1d8223a61203ee6c2a.content-bg-on.classic-layout-list article {\n  background: #e5dbc6;\n  box-shadow: none;\n}\n.blog-shortcode.blog-list-shortcode-id-99380b8528d31e1d8223a61203ee6c2a.dividers-on.classic-layout-list article {\n  margin-top: 5px;\n  padding-top: 0;\n}\n.blog-shortcode.blog-list-shortcode-id-99380b8528d31e1d8223a61203ee6c2a.dividers-on.classic-layout-list article:first-of-type {\n  margin-top: 0;\n  padding-top: 0;\n}\n.blog-shortcode.blog-list-shortcode-id-99380b8528d31e1d8223a61203ee6c2a.classic-layout-list.mode-list .post-thumbnail-wrap {\n  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#page .blog-shortcode.blog-list-shortcode-id-99380b8528d31e1d8223a61203ee6c2a .entry-excerpt {\n    margin: 15px 0 0;\n  }\n  #page .blog-shortcode.blog-list-shortcode-id-99380b8528d31e1d8223a61203ee6c2a .post-details {\n    margin: 5px 0 10px;\n  }\n  #page .blog-shortcode.blog-list-shortcode-id-99380b8528d31e1d8223a61203ee6c2a .post-details.details-type-link {\n    margin-bottom: 2px;\n  }\n}<\/style><div class=\"articles-list blog-shortcode mode-list blog-list-shortcode-id-99380b8528d31e1d8223a61203ee6c2a classic-layout-list content-bg-on jquery-filter scale-img dt-icon-bg-off loading-effect-fade-in\" data-cur-page=\"1\" data-post-limit=\"-1\" data-pagination-mode=\"none\"><article class=\"post project-odd visible no-img post-8051 type-post status-publish format-standard hentry category-materials-en category-67 description-off\" data-name=\"Pigments\" data-date=\"2021-12-02T10:07:38+02:00\">\n\n<div class=\"post-entry-content\">\n\n\t<h3 class=\"entry-title\">\n\t\t<a href=\"https:\/\/www.caraa.fr\/en\/pigments\/\" title=\"Pigments\" rel=\"bookmark\">Pigments<\/a>\n\t<\/h3>\n\n\t\n\t\n\t\n<\/div><\/article><article class=\"post project-odd visible no-img post-8054 type-post status-publish format-standard hentry category-materials-en category-67 description-off\" data-name=\"Metals\" data-date=\"2020-12-02T10:04:24+02:00\">\n\n<div class=\"post-entry-content\">\n\n\t<h3 class=\"entry-title\">\n\t\t<a href=\"https:\/\/www.caraa.fr\/en\/metals\/\" title=\"Metals\" rel=\"bookmark\">Metals<\/a>\n\t<\/h3>\n\n\t\n\t\n\t\n<\/div><\/article><article class=\"post project-odd visible no-img post-8057 type-post status-publish format-standard hentry category-materials-en category-67 description-off\" data-name=\"Glass\" data-date=\"2019-12-02T10:09:34+02:00\">\n\n<div class=\"post-entry-content\">\n\n\t<h3 class=\"entry-title\">\n\t\t<a href=\"https:\/\/www.caraa.fr\/en\/glass\/\" title=\"Glass\" rel=\"bookmark\">Glass<\/a>\n\t<\/h3>\n\n\t\n\t\n\t\n<\/div><\/article><article class=\"post project-odd visible no-img post-8060 type-post status-publish format-standard hentry category-materials-en category-67 description-off\" data-name=\"Stones and Rocks\" data-date=\"2018-12-02T10:12:05+02:00\">\n\n<div class=\"post-entry-content\">\n\n\t<h3 class=\"entry-title\">\n\t\t<a href=\"https:\/\/www.caraa.fr\/en\/rocks\/\" title=\"Stones and Rocks\" rel=\"bookmark\">Stones and Rocks<\/a>\n\t<\/h3>\n\n\t\n\t\n\t\n<\/div><\/article><article class=\"post project-odd visible no-img post-8063 type-post status-publish format-standard hentry category-materials-en category-67 description-off\" data-name=\"Organic material\" data-date=\"2016-12-02T10:14:06+02:00\">\n\n<div class=\"post-entry-content\">\n\n\t<h3 class=\"entry-title\">\n\t\t<a href=\"https:\/\/www.caraa.fr\/en\/organics\/\" title=\"Organic material\" rel=\"bookmark\">Organic material<\/a>\n\t<\/h3>\n\n\t\n\t\n\t\n<\/div><\/article><article class=\"post project-odd visible no-img post-1249 type-post status-publish format-standard hentry category-materials-en category-67 description-off\" data-name=\"Toxic material\" data-date=\"2014-01-02T10:15:47+02:00\">\n\n<div class=\"post-entry-content\">\n\n\t<h3 class=\"entry-title\">\n\t\t<a href=\"https:\/\/www.caraa.fr\/en\/toxics\/\" title=\"Toxic material\" rel=\"bookmark\">Toxic material<\/a>\n\t<\/h3>\n\n\t\n\t\n\t\n<\/div><\/article><\/div>[\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column width=&#8221;2\/3&#8243;][vc_column_text] Semi-precious stones, as well as rocks belong to the mineral world. Again, the role of CARAA is to determine the most efficient methods to scan an object according to its value, size, conservation state and, the sampling opportunities &#8230; or the non-invasive possibilities. Choosing the appropriate techniques Understanding a gem or a mineral&hellip;<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ngg_post_thumbnail":0,"_FSMCFIC_featured_image_caption":"","_FSMCFIC_featured_image_nocaption":null,"_FSMCFIC_featured_image_hide":null,"footnotes":""},"categories":[67],"tags":[],"class_list":["post-8060","post","type-post","status-publish","format-standard","hentry","category-materials-en","category-67","description-off"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Stones and Rocks at CARAA<\/title>\n<meta name=\"description\" content=\"The experience at CARAA in the analysis of rocks, minerals and jewellery (precious and semi-precious stones, antique gems, rare minerals, ...)\" \/>\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.caraa.fr\/en\/rocks\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Stones and Rocks at CARAA\" \/>\n<meta property=\"og:description\" content=\"The experience at CARAA in the analysis of rocks, minerals and jewellery (precious and semi-precious stones, antique gems, rare minerals, ...)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.caraa.fr\/en\/rocks\/\" \/>\n<meta property=\"og:site_name\" content=\"CARAA\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/LaboratoireCaraa\/\" \/>\n<meta property=\"article:published_time\" content=\"2018-12-02T08:12:05+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-07-11T10:20:11+00:00\" \/>\n<meta name=\"author\" content=\"abougard\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@CARAA_Center\" \/>\n<meta name=\"twitter:site\" content=\"@CARAA_Center\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"abougard\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\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.caraa.fr\\\/en\\\/rocks\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/rocks\\\/\"},\"author\":{\"name\":\"abougard\",\"@id\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/#\\\/schema\\\/person\\\/14189abfeddca50e721e0a25b5f084c6\"},\"headline\":\"Stones and Rocks\",\"datePublished\":\"2018-12-02T08:12:05+00:00\",\"dateModified\":\"2022-07-11T10:20:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/rocks\\\/\"},\"wordCount\":317,\"publisher\":{\"@id\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/#organization\"},\"articleSection\":[\"Materials\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/rocks\\\/\",\"url\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/rocks\\\/\",\"name\":\"Stones and Rocks at CARAA\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/#website\"},\"datePublished\":\"2018-12-02T08:12:05+00:00\",\"dateModified\":\"2022-07-11T10:20:11+00:00\",\"description\":\"The experience at CARAA in the analysis of rocks, minerals and jewellery (precious and semi-precious stones, antique gems, rare minerals, ...)\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.caraa.fr\\\/en\\\/rocks\\\/\"]}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/\",\"name\":\"CARAA\",\"description\":\"Centre d&#039;Analyses et de Recherche en Art et Arch\u00e9ologie\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.caraa.fr\\\/en\\\/#organization\",\"name\":\"CARAA - 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