{"product_id":"acanthite-pseudomorphous-after-argentite","title":"ACANTHITE pseudomorphous after ARGENTITE","description":"This is a superb old-time European silver sulphide, magnificent in its crystallization. Miniature in size, the Acanthite crystals are incredibly prominent forming stacked, repeatedly twinned octahedral crystals, displaying a metallic grey appearance. Acanthite is technically monoclinic (bladed) in form but its polymorph Argentite is isometric (cubic). However, Argentite does not exist at below 177 C at atmospheric pressure - the internal form being replaced, or pseudomorphed, perfectly by Acanthite. The largest crystal here measures an impressive 1 cm across and in combination with the others forms an arborescent array in several crystal branches. It is from the important historic silver-mining district of Freiberg in Saxony, Germany. A stunning miniature specimen of rich silver ore with fine crystals. A green Richard W. Barstow sales label dating to pre-1982 accompanies this specimen.","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":57780362084687,"sku":"CC10072","price":3701.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/3748\/2063\/files\/CC10072_aee33bd5-4c7f-4aa8-9484-5b4b027ce963.jpg?v=1783967835","url":"https:\/\/crystalclassics.co.uk\/products\/acanthite-pseudomorphous-after-argentite","provider":"Crystal Classics UK","version":"1.0","type":"link"}