{"product_id":"clausthalite-with-calcite","title":"CLAUSTHALITE   with CALCITE","description":"Clausthalite is a rare lead selenide (PbSe) and on this small cabinet specimen forms granular metallic patches sparsely distributed through a massive milky white Calcite matrix.  The largest patch of Clausthalite measures 7 x 3 mm and all occurrences are metallic black, often with a slight iridescent blue sheen.  The Calcite surrounding the Clausthalite is partly crystallised, displaying occasional prism faces.  The Calcite covers the top surface of a black and earthy carmine basaltic looking matrix.  A rather lovely old German label accompanies this specimen, written in a beautiful, yet now somewhat faint, copperplate hand.","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":57781214806351,"sku":"CC28407","price":666.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/3748\/2063\/files\/CC28407_f39a5e32-7276-4ebc-b66c-f9d666a33f39.jpg?v=1783981969","url":"https:\/\/crystalclassics.co.uk\/products\/clausthalite-with-calcite","provider":"Crystal Classics UK","version":"1.0","type":"link"}