{"product_id":"acanthite-with-nickeline-1","title":"ACANTHITE   with NICKELINE","description":"This excellent and rare specimen of crystallised Acanthite with Nickeline is from M?d?nec in the 'st' nad Labem Region of the Czech Republic; a copper mining district that worked a copper skarn deposit.  Skarn, a Scandinavian name for 'rubbish', describes where an igneous intrusion has contacted a carbonate horizon, hence causing metamorphism adjacent to the contact.  The Acanthite, a low temperature silver sulphide, forms intergrown, silvery lead-grey crystals which form a 1 cm thick and 4 cm long cylindrical band, folded around two sides of the specimen.  Individual Acanthite crystals are also dotted over the inner core of micro-Quartz encrusted chocolate-bronze Nickeline, a nickel arsenide.  An interesting mix of these silver and nickel species from M?d?nec.","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":57781039890767,"sku":"CC19980","price":740.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/3748\/2063\/files\/CC19980_bf53ca63-7899-4845-90ad-abfc8ac1d5d5.jpg?v=1783977669","url":"https:\/\/crystalclassics.co.uk\/products\/acanthite-with-nickeline-1","provider":"Crystal Classics UK","version":"1.0","type":"link"}