Rock crystal<\/a>\u00a0is the colourless, transparent variety of quartz and consists of pure silicon dioxide. It crystallises in the trigonal crystal system and often forms well-developed six-sided prisms with a pointed tip. Owing to its clarity and vitreous lustre, rock crystal is one of the best-known and most widely used varieties of quartz.<\/p>\n The mineral occurs worldwide, with important deposits in Brazil, Madagascar, Switzerland and the United States, among others. Rock crystal occurs in hydrothermal veins, pegmatites and metamorphic rocks. Its chemical formula is SiO\u2082 and its hardness is 7 on the Mohs scale. Well-known varieties of quartz such as rose quartz, amethyst and smoky quartz differ from rock crystal by their colour-causing inclusions or radiative influences.<\/p>\n Sources:<\/strong> Bergkristal Bergkristal\u00a0is de kleurloze, transparante vari\u00ebteit van kwarts en bestaat uit zuiver siliciumdioxide. Het kristalliseert in het trigonaal kristalsysteem en vormt vaak goed ontwikkelde zeszijdige prisma\u2019s met een puntige uiteinde. Door zijn helderheid en glasachtige glans is bergkristal een van de bekendste en meest gebruikte kwartsvarianten. Het mineraal komt wereldwijd voor, met belangrijke vindplaatsen in […]<\/p>\n","protected":false},"featured_media":72457,"template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"soort":[],"product_brand":[],"product_cat":[1066],"product_tag":[],"class_list":["post-71415","product","type-product","status-publish","has-post-thumbnail","product_cat-schedels","pa_herkomst-china","pa_soort-bergkristal","pa_verkoopeenheid-per-stuk","pa_vorm-schedel","desktop-align-center","tablet-align-center","mobile-align-center","ast-product-gallery-layout-horizontal-slider","ast-product-tabs-layout-horizontal","first","instock","taxable","shipping-taxable","product-type-simple"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.ruschmineralen.nl\/en\/wp-json\/wp\/v2\/product\/71415","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ruschmineralen.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.ruschmineralen.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ruschmineralen.nl\/en\/wp-json\/wp\/v2\/media\/72457"}],"wp:attachment":[{"href":"https:\/\/www.ruschmineralen.nl\/en\/wp-json\/wp\/v2\/media?parent=71415"}],"wp:term":[{"taxonomy":"soort","embeddable":true,"href":"https:\/\/www.ruschmineralen.nl\/en\/wp-json\/wp\/v2\/soort?post=71415"},{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.ruschmineralen.nl\/en\/wp-json\/wp\/v2\/product_brand?post=71415"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.ruschmineralen.nl\/en\/wp-json\/wp\/v2\/product_cat?post=71415"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.ruschmineralen.nl\/en\/wp-json\/wp\/v2\/product_tag?post=71415"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nMindat.org<\/a>,\u00a0Gemdat.org<\/a>,\u00a0Wikipedia \u2013 Quartz<\/a><\/small><\/p>","protected":false},"excerpt":{"rendered":"