{"title":"Calcite","description":"\u003cp\u003e\u003cstrong\u003eCalcite\u003c\/strong\u003e is one of the most abundant and versatile minerals on Earth — a trigonal \u003cstrong\u003ecalcium carbonate\u003c\/strong\u003e (CaCO3) that crystallizes in an astonishing variety of forms, from sharp \u003cstrong\u003escalenohedrons\u003c\/strong\u003e (\"dogtooth spar\") and flat rhombohedra (\"nailhead spar\") to massive, fibrous, and stalactitic habits. Its perfect three-directional cleavage, hardness of only 3 on the Mohs scale, and frequent fluorescence and phosphorescence under UV light make it endlessly fascinating to collectors and scientists alike.\u003c\/p\u003e\u003cp\u003eClassic type localities include the \u003cstrong\u003eElmwood Mine\u003c\/strong\u003e in Tennessee, famed for giant lustrous scalenohedrons, and \u003cstrong\u003eJoplin, Missouri\u003c\/strong\u003e, source of some of the largest calcite crystals ever recovered. Mexico's \u003cstrong\u003eGuanajuato\u003c\/strong\u003e and \u003cstrong\u003eSanta Eulalia\u003c\/strong\u003e district, Namibia's \u003cstrong\u003eTsumeb\u003c\/strong\u003e, Congo's \u003cstrong\u003eKatanga\u003c\/strong\u003e, and Romania's \u003cstrong\u003eHerja\u003c\/strong\u003e, celebrated for bicolored calcite balls, all yield exceptional specimens, while \u003cstrong\u003eDalnegorsk\u003c\/strong\u003e in Russia has produced optical-quality crystals up to 30 cm. The historic \u003cstrong\u003eHelgustaðir Mine\u003c\/strong\u003e in Iceland gave the world \u003cstrong\u003eIceland spar\u003c\/strong\u003e, the flawless, doubly-refractive variety once used in bombsights, polarizing prisms, and possibly Viking navigation.\u003c\/p\u003e\u003cp\u003eCollectors prize calcite for its extraordinary morphological diversity, association with fluorite, sphalerite, stibnite, and amethyst, and dazzling optical properties like birefringence. From honey-colored crystals of Malmberget, Sweden, to English classics from Egremont and Alston Moor, every locality produces its own signature habit and color, making calcite a cornerstone species for any serious mineral cabinet.\u003c\/p\u003e","products":[{"product_id":"lz-matryoshka-calcite-usa","title":"CALCITE “MATRYOSHKA” – Large 12cm Orange Calcite Crystal from Missouri, USA","description":"\u003cp\u003eLarge natural orange Calcite “Matryoshka” crystal from Sweetwater Mine, Reynolds County, Missouri, USA. Exceptional museum-quality specimen over 12 cm with nested calcite growth and sharp crystal faces. \u003cbr\u003e\u003cbr\u003e\u003cstrong data-start=\"470\" data-end=\"487\"\u003eMineral Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong data-start=\"488\" data-end=\"503\"\u003eDimensions:\u003c\/strong\u003e 142 x 140 x 93 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrystal Size:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan\u003e~\u003c\/span\u003e\u003c\/strong\u003e120 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong data-start=\"522\" data-end=\"533\"\u003eWeight:\u003c\/strong\u003e 1294 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong data-start=\"541\" data-end=\"556\"\u003eProvenance:\u003c\/strong\u003e Sweetwater Mine, Reynolds County, Missouri, USA\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":44420141154413,"sku":null,"price":399.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/imgi_372_AGC_20240909_191142037.jpg?v=1772665369"},{"product_id":"lz-conichalcite-calcite-mexicco","title":"CONICHALCITE \u0026 CALCITE – Vibrant Green Contrast from Ojuela Mine, Mexico","description":"\u003cp\u003eNatural Calcite on Conichalcite from Ojuela Mine, Mapimí, Durango, Mexico. Attractive specimen featuring well-formed Calcite crystals set on a vivid green Conichalcite matrix, creating a strong and aesthetic color contrast. Highly collectible association piece with excellent visual impact. \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong data-start=\"550\" data-end=\"567\"\u003eMineral Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong data-start=\"568\" data-end=\"583\"\u003eDimensions:\u003c\/strong\u003e 110 x 50 x 32 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong data-start=\"601\" data-end=\"612\"\u003eWeight:\u003c\/strong\u003e 176 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong data-start=\"619\" data-end=\"634\"\u003eProvenance:\u003c\/strong\u003e Ojuela Mine, Mapimí, Durango, Mexico\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45425068998765,"sku":null,"price":75.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/IMG20260308134019.jpg?v=1783145368"},{"product_id":"fa15-marcasite-calcite-sardegna","title":"GOLDEN MARCASITE – \"Snow-Capped Mountain\" on Calcite, Sardinia, Italy","description":"\u003cdiv class=\"_chunkWrapper_6ta1u_30\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"2\"\u003eNatural \u003c\/span\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"35\"\u003eMarcasite on Calcite from the historic \u003c\/span\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"74\"\u003eSilius vein system, Sardinia, Italy. \u003c\/span\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"111\"\u003eGolden marcasite crystals blanket the \u003c\/span\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"149\"\u003ewhite calcite matrix in a striking \u003c\/span\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"184\"\u003e\"snow-capped mountain\" pattern, with \u003c\/span\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"221\"\u003econfirmed red fluorescence under UV \u003c\/span\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"257\"\u003elight — a documented trait of calcite \u003c\/span\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"295\"\u003efrom this classic locality.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"_chunkWrapper_6ta1u_30\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"2\"\u003eMineral Data:\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"2\"\u003eDimensions:\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"2\"\u003e 116 \u003c\/span\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"40\"\u003e× 101 × 60 mm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"40\"\u003eWeight:\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"40\"\u003e 584 g\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"78\"\u003eProvenance:\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"78\"\u003e Muscadroxius-Genna Tres \u003c\/span\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"116\"\u003eMontis Mine, Silius, South Sardinia \u003c\/span\u003e\u003cspan class=\"_animating_6ta1u_10\" data-newtext-seq=\"152\"\u003eProvince, Sardinia, Italy\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45443806986349,"sku":null,"price":199.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/IMG20260308223015.jpg?v=1783612959"}],"url":"https:\/\/www.italmineral.com\/collections\/calcite.oembed","provider":"ITALMINERAL","version":"1.0","type":"link"}