{"product_id":"bournonite-with-freibergite-2","title":"BOURNONITE   with FREIBERGITE","description":"This is a spectacular open group of superb Bournonite crystals displaying an excellent cogwheel habit, all embedded in a matrix of finely crystallised Freibergite. Things do not get much better when even the matrix is a well crystallised rare sulphosalt!  Four major Bournonite crystals dominate the specimen with three of these sitting at the front.  Other smaller Bournonite crystals to over 1 cm are distributed throughout the Freibergite.  The three main display Bournonites measure approximately 2.2 x 2.2 x 0.7 cm, 2.2 x 1.5 x 1.0 cm and 1.7 x 1.2 x 1.0 cm.  All Bournonites are lustrous metallic silver-grey with mirror-flat pinacoid faces and deeply striated\/grooved cogwheel prism faces, with some forming interpenetrant pairs.  The Freibergite, a complex silver-copper-iron-antimony-arsenic sulphosalt, forms as gunmetal-grey crystals all to about 1 mm across, of which there are many thousand on the specimen.  Bournonite is a lead-copper sulphosalt and is classified as a lead-copper antimoniate.  A magnificent large miniature, or small cabinet, specimen of Bournonite with Freibergite from Bolivia.","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":57781040087375,"sku":"CC19998","price":1480.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/3748\/2063\/files\/CC19998_67047cf3-a46b-48f2-857c-44cbbb99ed54.jpg?v=1783977680","url":"https:\/\/crystalclassics.co.uk\/products\/bournonite-with-freibergite-2","provider":"Crystal Classics UK","version":"1.0","type":"link"}