{"product_id":"optical-calcite","title":"Optical Calcite","description":"\u003cp\u003eOptical Calcite, or Iceland Spar, is a highly transparent, rhombohedral form of calcite known for extreme birefringence (double refraction). It splits light into two rays, causing a double image effect. Used historically by Vikings for navigation, it is now used in polarizing prisms and microscopes. \u003c\/p\u003e","brand":"GeoCentral","offers":[{"title":"Default Title","offer_id":45647541076165,"sku":"6981","price":2.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0751\/9915\/2325\/files\/OpticalCalcite_3.webp?v=1776197994","url":"https:\/\/explorestore.museumofdiscovery.org\/products\/optical-calcite","provider":"Explore Store","version":"1.0","type":"link"}