{"id":825,"date":"2026-02-02T21:56:06","date_gmt":"2026-02-02T21:56:06","guid":{"rendered":"https:\/\/www.rawtothecorecrystals.co.uk\/shop\/?post_type=product&#038;p=825"},"modified":"2026-02-02T21:56:07","modified_gmt":"2026-02-02T21:56:07","slug":"brazilian-smoky-quartz-point","status":"publish","type":"product","link":"https:\/\/www.rawtothecorecrystals.co.uk\/shop\/product\/brazilian-smoky-quartz-point\/","title":{"rendered":"Brazilian smoky quartz point"},"content":{"rendered":"<p data-start=\"193\" data-end=\"488\">This specimen is a <strong data-start=\"212\" data-end=\"256\">naturally occurring smoky quartz crystal<\/strong>, a variety of <strong data-start=\"271\" data-end=\"290\">\u03b1-quartz (SiO\u2082)<\/strong> crystallized in the <strong data-start=\"311\" data-end=\"338\">trigonal crystal system<\/strong>. The crystal exhibits a prismatic habit with a single termination, consistent with quartz growth in <strong data-start=\"439\" data-end=\"487\">hydrothermal vein or pegmatitic environments<\/strong>.<\/p>\n<p data-start=\"490\" data-end=\"914\">The smoky coloration is caused by <strong data-start=\"524\" data-end=\"559\">radiation-induced color centers<\/strong> formed when natural ionizing radiation interacts with <strong data-start=\"614\" data-end=\"671\">trace aluminum (Al\u00b3\u207a) substituting for silicon (Si\u2074\u207a)<\/strong> within the quartz lattice. Electron displacement associated with this substitution results in light absorption in the visible spectrum, producing gray to brown hues. The color is thermally unstable and may be reduced or eliminated by heating.<\/p>\n<p data-start=\"916\" data-end=\"1168\">Crystal growth occurred from <strong data-start=\"945\" data-end=\"975\">silica-rich aqueous fluids<\/strong> under variable temperature and pressure conditions. Internal growth features such as veils, zoning, or minor inclusions reflect episodic changes in crystallization conditions during formation.<\/p>\n<p data-start=\"1170\" data-end=\"1443\">Brazil, particularly the <strong data-start=\"1195\" data-end=\"1231\">Minas Gerais geological province<\/strong>, is a globally significant source of smoky quartz due to its extensive granitic and pegmatitic systems, which provide favorable conditions for quartz crystallization and prolonged post-growth radiation exposure.<\/p>\n<p data-start=\"1445\" data-end=\"1474\"><strong data-start=\"1445\" data-end=\"1474\">Mineralogical properties:<\/strong><\/p>\n<ul data-start=\"1475\" data-end=\"1644\">\n<li data-start=\"1475\" data-end=\"1501\">\n<p data-start=\"1477\" data-end=\"1501\">Chemical formula: SiO\u2082<\/p>\n<\/li>\n<li data-start=\"1502\" data-end=\"1530\">\n<p data-start=\"1504\" data-end=\"1530\">Crystal system: Trigonal<\/p>\n<\/li>\n<li data-start=\"1531\" data-end=\"1553\">\n<p data-start=\"1533\" data-end=\"1553\">Hardness: 7 (Mohs)<\/p>\n<\/li>\n<li data-start=\"1554\" data-end=\"1578\">\n<p data-start=\"1556\" data-end=\"1578\">Fracture: Conchoidal<\/p>\n<\/li>\n<li data-start=\"1579\" data-end=\"1599\">\n<p data-start=\"1581\" data-end=\"1599\">Luster: Vitreous<\/p>\n<\/li>\n<li data-start=\"1600\" data-end=\"1644\">\n<p data-start=\"1602\" data-end=\"1644\">Transparency: Transparent to translucent<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1646\" data-end=\"1749\">This specimen represents a stable, naturally irradiated quartz crystal formed over geologic timescales.<\/p>\n","protected":false},"excerpt":{"rendered":"<h3 data-start=\"213\" data-end=\"245\">Brazilian Smoky Quartz Point<\/h3>\n<p data-start=\"247\" data-end=\"586\">This <strong data-start=\"252\" data-end=\"284\">Brazilian Smoky Quartz point<\/strong> is a naturally occurring variety of quartz (SiO\u2082) characterized by its translucent brown to deep gray coloration. The smoky color results from <strong data-start=\"428\" data-end=\"458\">natural ionizing radiation<\/strong> interacting with trace aluminum impurities within the quartz crystal lattice, creating stable color centers over geologic time.<\/p>\n<p data-start=\"588\" data-end=\"915\">Formed in <strong data-start=\"598\" data-end=\"642\">hydrothermal and pegmatitic environments<\/strong>, this crystal grew from silica-rich fluids under fluctuating temperature and pressure conditions. The well-defined point and prismatic habit reflect quartz\u2019s <strong data-start=\"801\" data-end=\"828\">trigonal crystal system<\/strong>, while subtle internal veils or growth features record changes during crystallization.<\/p>\n<p data-start=\"917\" data-end=\"1150\">Brazil\u2014particularly the <strong data-start=\"941\" data-end=\"964\">Minas Gerais region<\/strong>\u2014is one of the world\u2019s most significant sources of high-quality smoky quartz, known for producing crystals with excellent clarity, strong terminations, and consistent natural coloration.<\/p>\n<ul data-start=\"1152\" data-end=\"1350\">\n<li data-start=\"1152\" data-end=\"1175\">\n<p data-start=\"1154\" data-end=\"1175\"><strong data-start=\"1154\" data-end=\"1166\">Mineral:<\/strong> Quartz<\/p>\n<\/li>\n<li data-start=\"1176\" data-end=\"1206\">\n<p data-start=\"1178\" data-end=\"1206\"><strong data-start=\"1178\" data-end=\"1199\">Chemical formula:<\/strong> SiO\u2082<\/p>\n<\/li>\n<li data-start=\"1207\" data-end=\"1233\">\n<p data-start=\"1209\" data-end=\"1233\"><strong data-start=\"1209\" data-end=\"1222\">Hardness:<\/strong> 7 (Mohs)<\/p>\n<\/li>\n<li data-start=\"1234\" data-end=\"1266\">\n<p data-start=\"1236\" data-end=\"1266\"><strong data-start=\"1236\" data-end=\"1255\">Crystal system:<\/strong> Trigonal<\/p>\n<\/li>\n<li data-start=\"1267\" data-end=\"1289\">\n<p data-start=\"1269\" data-end=\"1289\"><strong data-start=\"1269\" data-end=\"1280\">Origin:<\/strong> Brazil<\/p>\n<\/li>\n<li data-start=\"1290\" data-end=\"1350\">\n<p data-start=\"1292\" data-end=\"1350\"><strong data-start=\"1292\" data-end=\"1308\">Color cause:<\/strong> Natural radiation-induced color centers<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1352\" data-end=\"1444\">Each point is a unique geological specimen shaped by millions of years of Earth\u2019s processes.<\/p>\n<hr data-start=\"1446\" data-end=\"1449\" \/>\n","protected":false},"featured_media":828,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[24,20,23],"product_tag":[43],"class_list":["post-825","product","type-product","status-publish","has-post-thumbnail","product_cat-clearquartz","product_cat-crystals","product_cat-quartz","product_tag-smoky-quartz","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.rawtothecorecrystals.co.uk\/shop\/wp-json\/wp\/v2\/product\/825","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rawtothecorecrystals.co.uk\/shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.rawtothecorecrystals.co.uk\/shop\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rawtothecorecrystals.co.uk\/shop\/wp-json\/wp\/v2\/comments?post=825"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.rawtothecorecrystals.co.uk\/shop\/wp-json\/wp\/v2\/media\/828"}],"wp:attachment":[{"href":"https:\/\/www.rawtothecorecrystals.co.uk\/shop\/wp-json\/wp\/v2\/media?parent=825"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.rawtothecorecrystals.co.uk\/shop\/wp-json\/wp\/v2\/product_brand?post=825"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.rawtothecorecrystals.co.uk\/shop\/wp-json\/wp\/v2\/product_cat?post=825"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.rawtothecorecrystals.co.uk\/shop\/wp-json\/wp\/v2\/product_tag?post=825"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}