{"product_id":"red-calcite-6","title":"Red calcite","description":"\u003cp\u003eRed calcite from Mexico\u003c\/p\u003e\n\u003cp\u003eYou will be picked on at random \u003c\/p\u003e\n\u003cp\u003eSizes range from-\u003cbr\u003e5.9cm x 5.1cm - 7.7cm x 4.8cm\u003c\/p\u003e\n\u003cp\u003eWeights range from-\u003cbr\u003e126g-164g\u003c\/p\u003e\n\u003cp\u003eRed calcite is a variety of calcium carbonate. Its colour comes from iron oxide inclusions or staining,such as hematite,within the crystal structure.\u003c\/p\u003e\n\u003cp\u003eCrystal system-Trigonal \u003cbr\u003eMineral class-Carbonate \u003cbr\u003eHardness-3 on the MOHs scale\u003cbr\u003eRock formation- \u003cbr\u003eSedimentary- calcite is a primary rock-forming mineral in sedimentary settings,making up the bulk of limestone,chalk,and travertine.\u003cbr\u003eMetamorphic- When limestone undergoes heat and pressure,calcite recrystallises to form marble.\u003cbr\u003eHydrothermal and secondary veins- Red calcite frequently precipitates from mineral-rich hydrothermal fluids in rock fractures,caves,and volcanic cavities. Iron rich fluids present during or after crystal growth impart the red or brick-red colouration. \u003cbr\u003e\u003c\/p\u003e","brand":"Crystal and fossils","offers":[{"title":"Default Title","offer_id":63267261940099,"sku":null,"price":8.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0563\/2524\/3040\/files\/IMG_2031.heic?v=1794332452","url":"https:\/\/crystalandfossils.co.uk\/products\/red-calcite-6","provider":"Crystal and fossils","version":"1.0","type":"link"}