{"id":7379,"date":"2026-08-31T12:05:19","date_gmt":"2026-08-31T10:05:19","guid":{"rendered":"https:\/\/renier.be\/?page_id=7379"},"modified":"2026-08-31T13:38:47","modified_gmt":"2026-08-31T11:38:47","slug":"composition-of-belgian-blue-stone","status":"publish","type":"page","link":"https:\/\/renier.be\/en\/de-steen-onderzocht\/samenstelling-belgische-blauwe-hardsteen\/","title":{"rendered":"Book III \u2013 Chapter 9 \u2013 Composition of Belgian Blue Stone"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"7379\" class=\"elementor elementor-7379\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e894411 e-flex e-con-boxed e-con e-parent\" data-id=\"e894411\" 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-f13be98 elementor-widget elementor-widget-html\" data-id=\"f13be98\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<style>\r\n\/* =========================================================\r\n   RENIER ENCYCLOPEDIE\r\n   BOEK III \u2013 HOOFDSTUK 9\r\n   ========================================================= *\/\r\n\r\n.renier-ch9{\r\n  --navy:#102f4a;\r\n  --navy-dark:#081f32;\r\n  --gold:#a5743d;\r\n  --gold-light:#c49a62;\r\n  --stone:#f3f1ed;\r\n  --blue-light:#eaf0f4;\r\n  --text:#17212a;\r\n\r\n  font-family:Arial,Helvetica,sans-serif;\r\n  color:var(--text);\r\n  background:#fff;\r\n}\r\n\r\n.renier-ch9 *{\r\n  box-sizing:border-box;\r\n}\r\n\r\n.renier-ch9 a{\r\n  text-decoration:none;\r\n}\r\n\r\n.r9-inner{\r\n  width:min(1180px,calc(100% - 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34px);\r\n  }\r\n\r\n  .r9-intro-grid{\r\n    grid-template-columns:1fr;\r\n    gap:30px;\r\n  }\r\n\r\n  .r9-toc-grid{\r\n    grid-template-columns:1fr;\r\n  }\r\n\r\n  .r9-section{\r\n    padding:48px 0;\r\n  }\r\n}\r\n\r\n@media(max-width:600px){\r\n\r\n  .r9-hero{\r\n    padding:58px 0 52px;\r\n  }\r\n\r\n  .r9-nav-inner{\r\n    flex-direction:column;\r\n    align-items:flex-start;\r\n  }\r\n}\r\n<\/style>\r\n\r\n\r\n<div class=\"renier-ch9\">\r\n\r\n\r\n<!-- HERO -->\r\n\r\n<section class=\"r9-hero\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <div class=\"r9-kicker\">\r\n      BOOK III \u00b7 CHAPTER 9\r\n    <\/div>\r\n\r\n    <h1>\r\n      Composition of Belgian Blue Stone\r\n    <\/h1>\r\n\r\n    <div class=\"r9-subtitle\">\r\n      What minerals, fossils, and fine particles make up this natural stone?\r\n    <\/div>\r\n\r\n    <p>\r\n      At first glance, Belgian Blue Stone appears to be a homogeneous\r\n      rock. Under a microscope, however, a much more complex\nworld of calcite, fossil remains, a fine limestone matrix, and small\nmineral components becomes apparent. Together, they determine the character, the structure,\nand the stone\u2019s typical blue-gray color.\r\n    <\/p>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- INTRO -->\r\n\r\n<section class=\"r9-intro\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <div class=\"r9-intro-grid\">\r\n\r\n      <div>\r\n\r\n        <div class=\"r9-label\">The Stone from the Inside Out<\/div>\r\n\r\n        <h2>What is Belgian Blue Stone made of?<\/h2>\r\n\r\n        <p>\r\n          Belgian Blue Bluestone is a compact, fossil-rich limestone.\n Its main mineral is calcite. In addition, the stone contains\n numerous fossil fragments and a very fine limestone matrix\n in which these components are embedded.\r\n        <\/p>\r\n\r\n        <p>\r\n          That composition is the result of the original\ndepositional environment, the marine life present, and the geological\nprocesses that ultimately transformed the sediment into natural stone.\r\n        <\/p>\r\n\r\n      <\/div>\r\n\r\n      <aside class=\"r9-intro-box\">\r\n\r\n        <strong>From Composition to Properties<\/strong>\r\n\r\n        <p>\r\n          The composition of a rock is more than just\na geological detail. Its mineralogical and fossil composition\nforms the basis for the texture, color, and technical properties\nthat we will examine in more detail in the following chapters.\r\n        <\/p>\r\n\r\n      <\/aside>\r\n\r\n    <\/div>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- INHOUD -->\r\n\r\n<section class=\"r9-toc\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <h2 class=\"r9-toc-title\">In this chapter<\/h2>\r\n\r\n    <div class=\"r9-toc-grid\">\r\n\r\n      <a href=\"#h9-1\">\r\n        <span class=\"r9-toc-number\">9.1<\/span>\r\n        <span>The Composition of Belgian Blue Stone<\/span>\r\n      <\/a>\r\n\r\n      <a href=\"#h9-2\">\r\n        <span class=\"r9-toc-number\">9.2<\/span>\r\n        <span>Calcite as the primary mineral<\/span>\r\n      <\/a>\r\n\r\n      <a href=\"#h9-3\">\r\n        <span class=\"r9-toc-number\">9.3<\/span>\r\n        <span>Fossil components and bioclasts<\/span>\r\n      <\/a>\r\n\r\n      <a href=\"#h9-4\">\r\n        <span class=\"r9-toc-number\">9.4<\/span>\r\n        <span>The fine limestone matrix<\/span>\r\n      <\/a>\r\n\r\n      <a href=\"#h9-5\">\r\n        <span class=\"r9-toc-number\">9.5<\/span>\r\n        <span>Other minerals and trace elements<\/span>\r\n      <\/a>\r\n\r\n      <a href=\"#h9-6\">\r\n        <span class=\"r9-toc-number\">9.6<\/span>\r\n        <span>Why is the stone blue-gray?<\/span>\r\n      <\/a>\r\n\r\n      <a href=\"#h9-7\">\r\n        <span class=\"r9-toc-number\">9.7<\/span>\r\n        <span>Composition under the microscope<\/span>\r\n      <\/a>\r\n\r\n      <a href=\"#h9-8\">\r\n        <span class=\"r9-toc-number\">9.8<\/span>\r\n        <span>Summary of Chapter 9<\/span>\r\n      <\/a>\r\n\r\n    <\/div>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- 9.1 -->\r\n\r\n<section class=\"r9-section\" id=\"h9-1\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <div class=\"r9-section-head\">\r\n\r\n      <div class=\"r9-section-number\">9.1<\/div>\r\n\r\n      <h2>The Composition of Belgian Blue Stone<\/h2>\r\n\r\n      <p>\r\n        Belgian Blue Bluestone consists mainly of calcite,\nsupplemented by fossil components, a fine limestone matrix,\nand small amounts of other minerals. This combination gives\nthe stone its distinctive structure and character.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <figure class=\"r9-figure\">\r\n      <img\r\n        src=\"https:\/\/renier.be\/wp-content\/uploads\/2026\/08\/09_01_waaruit_bestaat_belgische_blauwe_hardsteen-v2.png\"\"\r\n alt=\"Composition of Belgian Blue Stone, consisting of calcite, fossils, a limestone matrix, and minerals\"\r\n        loading=\"lazy\" data-neo-global--processed-neo-replace=\"true\">\r\n      <figcaption>\r\n        Figure 9.1 \u2014 The composition of Belgian Blue Stone.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- 9.2 -->\r\n\r\n<section class=\"r9-section alt\" id=\"h9-2\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <div class=\"r9-section-head\">\r\n\r\n      <div class=\"r9-section-number\">9.2<\/div>\r\n\r\n      <h2>Calcite as the primary mineral<\/h2>\r\n\r\n      <p>\r\n        Calcite forms the mineral foundation of Belgian Blue\nBluestone. The calcium carbonate is present in the original\ncalcareous components and in the cement that formed during\nthe rock\u2019s formation.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <figure class=\"r9-figure\">\r\n      <img decoding=\"async\"\r\n        src=\"https:\/\/renier.be\/wp-content\/uploads\/2026\/08\/09_02_calciet_belangrijkste_mineraal_belgische_blauwe_hardsteen.png\"\r\n        alt=\"Calcite as the primary mineral in Belgian Blue Stone\"\r\n        loading=\"lazy\" data-neo-global--processed-neo-replace=\"true\">\r\n      <figcaption>\r\n        Figure 9.2 \u2014 Calcite as the primary mineral.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- 9.3 -->\r\n\r\n<section class=\"r9-section\" id=\"h9-3\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <div class=\"r9-section-head\">\r\n\r\n      <div class=\"r9-section-number\">9.3<\/div>\r\n\r\n      <h2>Fossil components and bioclasts<\/h2>\r\n\r\n      <p>\r\n        A striking portion of the rock consists of the remains of organisms\nthat once lived in the tropical sea. Fragments of\ncrinoids, in particular, but also other fossil components, have been\npreserved in the rock.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <figure class=\"r9-figure\">\r\n      <img decoding=\"async\"\r\n        src=\"https:\/\/renier.be\/wp-content\/uploads\/2026\/08\/09_03_fossiele_bestanddelen_bioklasten_belgische_blauwe_hardsteenv2.png\"\r\n        alt=\"Fossil components and bioclasts in Belgian Blue Stone\"\r\n        loading=\"lazy\" data-neo-global--processed-neo-replace=\"true\">\r\n      <figcaption>\r\n        Figure 9.3 \u2014 Fossil components and bioclasts.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- 9.4 -->\r\n\r\n<section class=\"r9-section alt\" id=\"h9-4\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <div class=\"r9-section-head\">\r\n\r\n      <div class=\"r9-section-number\">9.4<\/div>\r\n\r\n      <h2>The fine limestone matrix<\/h2>\r\n\r\n      <p>\r\n        Among the larger fossil fragments is a much\nfiner, calcareous mass: the limestone matrix. It fills the spaces\nbetween the larger components and forms an important part\nof the stone\u2019s compact structure.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <figure class=\"r9-figure\">\r\n      <img decoding=\"async\"\r\n        src=\"https:\/\/renier.be\/wp-content\/uploads\/2026\/08\/09_04_fijne_kalksteenmatrix_belgische_blauwe_hardsteen.png\"\r\n        alt=\"Fine limestone matrix in Belgian Blue Stone\"\r\n        loading=\"lazy\" data-neo-global--processed-neo-replace=\"true\">\r\n      <figcaption>\r\n        Figure 9.4 \u2014 The fine limestone matrix.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- 9.5 -->\r\n\r\n<section class=\"r9-section\" id=\"h9-5\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <div class=\"r9-section-head\">\r\n\r\n      <div class=\"r9-section-number\">9.5<\/div>\r\n\r\n      <h2>Other minerals and trace elements<\/h2>\r\n\r\n      <p>\r\n        In addition to calcite, Belgian Blue Stone also contains small\namounts of other mineral components. Although their proportion\nis limited, they can contribute to color differences and\nlocal variations in the rock.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <figure class=\"r9-figure\">\r\n      <img decoding=\"async\"\r\n        src=\"https:\/\/renier.be\/wp-content\/uploads\/2026\/08\/09_05_andere_mineralen_kleine_bestanddelen_belgische_blauwe_hardsteen.png\"\r\n        alt=\"Other minerals and minor constituents in Belgian Blue Stone\"\r\n        loading=\"lazy\" data-neo-global--processed-neo-replace=\"true\">\r\n      <figcaption>\r\n        Figure 9.5 \u2014 Other minerals and minor constituents.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- 9.6 -->\r\n\r\n<section class=\"r9-section alt\" id=\"h9-6\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <div class=\"r9-section-head\">\r\n\r\n      <div class=\"r9-section-number\">9.6<\/div>\r\n\r\n      <h2>Why is the stone blue-gray?<\/h2>\r\n\r\n      <p>\r\n        The distinctive blue-gray color results from the combination\nof the fine limestone matrix, organic material, and very small\nmineral components. The final color perception is\nalso influenced by the chosen surface finish.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <figure class=\"r9-figure\">\r\n      <img decoding=\"async\"\r\n        src=\"https:\/\/renier.be\/wp-content\/uploads\/2026\/08\/09_06_waarom_belgische_blauwe_hardsteen_blauwgrijs_is.png\"\r\n        alt=\"Explanation of the Blue-Gray Color of Belgian Blue Bluestone\"\r\n        loading=\"lazy\" data-neo-global--processed-neo-replace=\"true\">\r\n      <figcaption>\r\n        Figure 9.6 \u2014 Why is Belgian Blue Bluestone blue-gray?\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- 9.7 -->\r\n\r\n<section class=\"r9-section\" id=\"h9-7\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <div class=\"r9-section-head\">\r\n\r\n      <div class=\"r9-section-number\">9.7<\/div>\r\n\r\n      <h2>Composition under the microscope<\/h2>\r\n\r\n      <p>\r\n        Under the microscope, it becomes clear how fossil fragments,\ncalcite, and the fine matrix together form a single compact rock.\nAt this scale, structures become visible that are barely\nor not at all visible to the naked eye.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <figure class=\"r9-figure\">\r\n      <img decoding=\"async\"\r\n        src=\"https:\/\/renier.be\/wp-content\/uploads\/2026\/08\/09_07_samenstelling_onder_microscoop_belgische_blauwe_hardsteen.png\"\r\n        alt=\"Microscopic Composition of Belgian Blue Stone\"\r\n        loading=\"lazy\" data-neo-global--processed-neo-replace=\"true\">\r\n      <figcaption>\r\n        Figure 9.7 \u2014 Cross-section viewed under a microscope.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- 9.8 -->\r\n\r\n<section class=\"r9-section alt\" id=\"h9-8\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <div class=\"r9-section-head\">\r\n\r\n      <div class=\"r9-section-number\">9.8<\/div>\r\n\r\n      <h2>Summary: The Composition of the Stone<\/h2>\r\n\r\n      <p>\r\n        Belgian Blue Bluestone is the result of a unique\ncombination of calcite, fossil components, a fine matrix, and\nsmall mineral components. Together, they form the material that\nwe recognize today as a compact, fossil-rich natural stone.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n    <figure class=\"r9-figure\">\r\n      <img decoding=\"async\"\r\n        src=\"https:\/\/renier.be\/wp-content\/uploads\/2026\/08\/09_08_samenvatting_samenstelling_belgische_blauwe_hardsteenv2.png\"\r\n        alt=\"Summary of the Composition of Belgian Blue Bluestone\"\r\n        loading=\"lazy\" data-neo-global--processed-neo-replace=\"true\">\r\n      <figcaption>\r\n        Figure 9.8 \u2014 Summary of the composition of Belgian Blue Stone.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- SLOT -->\r\n\r\n<section class=\"r9-callout\">\r\n  <div class=\"r9-inner\">\r\n\r\n    <div class=\"r9-callout-box\">\r\n\r\n      <h3>From Composition to Structure<\/h3>\r\n\r\n      <p>\r\n        We now know what Belgian Blue Stone is made of.\nBut just as important is how these components are\norganized within the rock. In Chapter 10, we will therefore\nexamine the texture, grain size distribution, and pore structure of the stone.\r\n      <\/p>\r\n\r\n    <\/div>\r\n\r\n  <\/div>\r\n<\/section>\r\n\r\n\r\n<!-- NAV -->\r\n\r\n<nav class=\"r9-nav\">\r\n  <div class=\"r9-inner r9-nav-inner\">\r\n\r\n    <a href=\"https:\/\/renier.be\/en\/examined-the-stone\/\">\r\n      <small>Previous<\/small>\r\n      <strong>\u2190 Book III \u2013 The Stone Examined<\/strong>\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/renier.be\/en\/examined-the-stone\/texture-and-pores-of-belgian-blue-stone\/\"\r\n       style=\"text-align:right;\">\r\n      <small>Next Chapter<\/small>\r\n      <strong>Chapter 10 \u2013 Texture and Pores \u2192<\/strong>\r\n    <\/a>\r\n\r\n  <\/div>\r\n<\/nav>\r\n\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>BOEK III \u00b7 HOOFDSTUK 9 Samenstelling van Belgische Blauwe Hardsteen Welke mineralen, fossielen en fijne bestanddelen vormen deze natuursteen? Belgische Blauwe Hardsteen lijkt op het eerste gezicht een homogeen gesteente. Onder de microscoop verschijnt echter een veel complexere wereld van calciet, fossiele resten, fijne kalksteenmatrix en kleine minerale bestanddelen. Samen bepalen ze het karakter, de [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":7388,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-7379","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Boek III - Hoofdstuk 9 -Samenstelling van Belgische Blauwe Hardsteen - Renier Natuursteen<\/title>\n<meta name=\"description\" content=\"Ontdek de samenstelling van Belgische Blauwe Hardsteen: calciet, fossielen, bioklasten, kalksteenmatrix en mineralen onder de microscoop.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/renier.be\/en\/examined-the-stone\/composition-of-belgian-blue-stone\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Boek III - Hoofdstuk 9 -Samenstelling van Belgische Blauwe Hardsteen - Renier Natuursteen\" \/>\n<meta property=\"og:description\" content=\"Ontdek de samenstelling van Belgische Blauwe Hardsteen: calciet, fossielen, bioklasten, kalksteenmatrix en mineralen onder de microscoop.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/renier.be\/en\/examined-the-stone\/composition-of-belgian-blue-stone\/\" \/>\n<meta property=\"og:site_name\" content=\"Renier Natuursteen\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/reniernatuursteen\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-31T11:38:47+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/renier.be\\\/de-steen-onderzocht\\\/samenstelling-belgische-blauwe-hardsteen\\\/\",\"url\":\"https:\\\/\\\/renier.be\\\/de-steen-onderzocht\\\/samenstelling-belgische-blauwe-hardsteen\\\/\",\"name\":\"Boek III - Hoofdstuk 9 -Samenstelling van Belgische Blauwe Hardsteen - Renier Natuursteen\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/renier.be\\\/#website\"},\"datePublished\":\"2026-08-31T10:05:19+00:00\",\"dateModified\":\"2026-08-31T11:38:47+00:00\",\"description\":\"Ontdek de samenstelling van Belgische Blauwe Hardsteen: calciet, fossielen, bioklasten, kalksteenmatrix en mineralen onder de microscoop.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/renier.be\\\/de-steen-onderzocht\\\/samenstelling-belgische-blauwe-hardsteen\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/renier.be\\\/de-steen-onderzocht\\\/samenstelling-belgische-blauwe-hardsteen\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/renier.be\\\/de-steen-onderzocht\\\/samenstelling-belgische-blauwe-hardsteen\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/renier.be\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Boek III \u2013 De steen onderzocht\",\"item\":\"https:\\\/\\\/renier.be\\\/de-steen-onderzocht\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Boek III &#8211; 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