{"product_id":"bournonite-with-freibergite-1","title":"BOURNONITE   with FREIBERGITE","description":"The Viboras mine at Machacamarca in the Potosí Department of Bolivia is most famous for its well-crystallised Bournonite.  This small miniature features several excellent cog-wheel crystals and for added interest these are entwined with stalactitic rod-like overgrowths of the mineral Freibergite.  It should be pointed out that Freibergite is now of a somewhat uncertain status and currently goes under the collective Freibergite Subgroup.  The Bournonite crystals are developed up to 1.9 cm across and have a brilliant steel-grey metallic lustre.  By contrast the micro-crystallised Freibergite tends to be a sooty matt black.","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":57781039661391,"sku":"CC19966","price":962.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/3748\/2063\/files\/CC19966.jpg?v=1783977652","url":"https:\/\/crystalclassics.co.uk\/products\/bournonite-with-freibergite-1","provider":"Crystal Classics UK","version":"1.0","type":"link"}