Pictures have been enlarged to show detail. This unfortunately cannot be avoided.
Origin: Winton opal fields, Queensland. Carat weight total: 5550 carats or 1.11 Kilograms. Stone Size approx: 14 x 8.7 x 4.4 cm at longest points.
Fairy opal is basically a sandstone base rock impregnated with tiny pieces of precious opal. Because the sandstone is very pale it is often difficult to see the play of opal colour in the stone and hence a method of darkening the sandstone background was developed so the colour of the opal could be seen.
These stones have been treated or'cooked' in order to darken the base to bring forth the beautiful opal colour. The treatment does not change the opal or stone in any way other than darkening it to give it an enhanced colour flash. The method used is to cook the stones is heating in oil.The oil penetrates the pores of the sandstone and the heat burns the oil then carbonises it thus darkening the stone. Small Satchel/Box up to 5kg. Medium Satchel/Box up to 5kg. Large Satchel/Box up to 5kg. There is no limit to how many items you can combine within the weight limits. Please keep in mind that items need to be packaged and wrapped for safe travels and this adds weight. All parcels are sent with tracking numbers. Heavier parcels will have a higher cost. Please find and like us on Facebook. The item "Lapidary Hobby 1.11 KG Piece of Winton Fairy Opal Rough, Specimen Collectable" is in sale since Tuesday, November 19, 2019. This item is in the category "Collectables\Rocks, Fossils, Minerals\Crystals". The seller is "123hartanto" and is located in Brisbane, QLD. This item can be shipped worldwide.