{"product_id":"set-of-rock-crystals-quartz-100-g","title":"Set of Rock Crystals Quartz 100 g","description":"\u003cul\u003e\n\u003cli\u003eTotal mass: 100 gramms\u003c\/li\u003e\n\u003cli\u003ea crystal size: 15-35 millimeters\u003c\/li\u003e\n\u003cli\u003ecrystal mass: 1-3 gramms\u003c\/li\u003e\n\u003cli\u003eConfirmed with gemmological experise\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNatural rock crystal weighs 100 grams. Crystal weight is 1-3 grams. Size is 1.5-3.5 cm. There is a gemological examination report from the Assay Office. Ancient Greek philosophers believed that rock crystal is ice turned into stone. That is where the name crystal comes from, from \"kristallos\" - like ice. It has low thermal conductivity, so crystal crystals are always cold to the touch, which distinguishes them from glass. Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar.\u003c\/p\u003e","brand":"CozieCorners","offers":[{"title":"Default Title","offer_id":45528599789615,"sku":"B0DRN25L49","price":33.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/3498\/9615\/files\/71uk_fLpL9L._AC_SL1500_e73a374c-f948-43a0-9f0c-5fa36883eb31.jpg?v=1782644512","url":"https:\/\/www.coziecorners.com\/products\/set-of-rock-crystals-quartz-100-g","provider":"CozieCorners","version":"1.0","type":"link"}