{"product_id":"thaumasite","title":"THAUMASITE","description":"A superb, gemmy colourless prismatic Thaumasite, from the N'Chwaning mines in South Africa.  Thaumasite is a rare and complex calcium silicate which includes a carbonate component and sometimes a sulphite.  This 2.6 x 2.2 x 1.5 cm cluster of crystals, although colourless, does contain a hint of yellowish-green and is attached to a thin patchy crust of chocolate brown siliceous matrix.  About eight Thaumasite crystals make up this large thumbnail, the largest by far being 1.8 x 1.0 x 0.8 cm.  All the crystals are transparent and contain many gemmy zones plus patches of iridescent interference colours within the prism bodies.  This is a well crystallised specimen of Thaumasite from the N'Chwaning mines within the Kalahari Manganese Field.","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":57781128233295,"sku":"CC20439","price":555.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/3748\/2063\/files\/CC20439_1f3ab153-2376-4537-8d7c-baeb3e87310b.jpg?v=1783978121","url":"https:\/\/crystalclassics.co.uk\/products\/thaumasite","provider":"Crystal Classics UK","version":"1.0","type":"link"}