{"product_id":"gratonite-2","title":"GRATONITE","description":"This specimen provides a great opportunity to acquire an exceptionally rare species from a world-famous yet seldom seen locality, the Rio Tinto mine in Andalusia, Spain.  An excellent crystallised specimen of the lead-arsenic sulphosalt Gratonite, ex-matrix and composed from perfect, sharply defined Gratonite crystals intermixed with granular Gratonite.  The trigonal crystals attain at least 5 mm and line the vuggy interior and external faces of this highly porous small miniature (or large thumbnail).  The Gratonite is a sooty dark grey to black with a dull to metallic lustre.  It's great to see a specimen from the Rio Tinto mines, a locality I visited forty five years ago and have fond memories of.  This rare sulphosalt is from the Dr Josef Clemente Collection of southern Germany and comes with a 'Museo Mineralogico of Madrid' label.","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":57781135737167,"sku":"CC21114","price":1850.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/3748\/2063\/files\/CC21114_aa24a540-30a8-41ae-af72-fd9f969735a1.jpg?v=1783978893","url":"https:\/\/crystalclassics.co.uk\/products\/gratonite-2","provider":"Crystal Classics UK","version":"1.0","type":"link"}