{"product_id":"herzenbergite-polished-section","title":"HERZENBERGITE polished section","description":"Herzenbergite is a very rare tin sulphide and a species which never occurs in nice visible crystals. In fact nearly all of its somewhat limited worldwide occurrences are as massive black patches in tin-bearing veinstone. Not surprisingly, one of the best ways to identify it, and to view it, is as a polished reflective surface like in this standard resin-mounted polished section. This type of sample requires a specialist optical microscope for reflected light study, under which the specific properties of this unusual mineral are apparent. Within the mount, a 1.8 x 1 cm long chip of rock is seen to contain four or five individual dark coloured grains, the longest to about 2 mm in length. The polished section has a ring of grey carbon surrounding the rock chip, indicating that it has also been analysed using a Scanning Electron Microscope (SEM) but no analytical details are provided. This sample is from the famous Swedish occurrence at Järkvissle near Sundsvall, in Västernorrland, where Herzenbergite was found in a tin-rich pegmatite during the early 1990s.","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":58506958700879,"sku":"CC18308","price":111.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/3748\/2063\/files\/CC18308_990089dc-b06f-42af-bf60-ea4c44f3521d.jpg?v=1787065230","url":"https:\/\/crystalclassics.co.uk\/products\/herzenbergite-polished-section","provider":"Crystal Classics UK","version":"1.0","type":"link"}