{"product_id":"opal-var-boulder-opal-in-ironstone","title":"OPAL Var. BOULDER OPAL in IRONSTONE","description":"A stunning specimen of the Opal variety known as 'Boulder Opal' from one of the less well-known Australian opal localities of Quilpie in southern Queensland, Australia.  The siliceous ironstone matrix varies from milk chocolate to dark chocolate-brown and is part of a larger concretion which has fractured internally at some stage of its formation, similar to a septarian nodule.  In this case, the fracture filling has been a colloidal silicate gel leading to the formation of Opal.  The specimen has been sawn to form a base and is highly polished on all faces.  The display face is a spectacular network of polygonal facture infillings of electric blue and green Opal with a major opalized area of approximately 6.5 x 4 cm.   The Opal is predominantly vivid shades of blue, mauve, violet and green, but shows occasional bright flashes of orange-red.  A thoroughly excellent example of 'Boulder Opal' from Queensland and of high-end museum quality.  ","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":46542959771823,"sku":"CC10547","price":6500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/8516\/2671\/files\/CC10547.png?v=1770296378","url":"https:\/\/crystalclassics.com\/products\/opal-var-boulder-opal-in-ironstone","provider":"Crystal Classics","version":"1.0","type":"link"}