EVALUATION OF CARVED LIGHTNING RIDGE BLACK OPAL A discussion paper originally written for the valuer’s in Australia The picture to the left is a carving known as Boat on Sandstone an is an artistically abstract freeform black opal carving of seam opal . Originating from the Mulga field, gGawin in the Lightning ridge district, Carved by Christine Roussel. Download Extract Featured Chemistry Techniques used in researching opal - Neville Curtis A discussion on Ethiopian Opal from our french colleagues. African Opal Unearthed Play-of-Colour Opal from Wegel Tena, Wollo Province Ethiopia The Origin of Digit patterns Ethiopia: A new source of Precious Opal WHITE CLIFFS-CRAM The White Cliffs Royal Commission White Cliffs Opal Field- A report by NSW Geological Survey White Cliffs Opal Fields a commentary by Gwen Rowe OPAL CARVING-DANIELA L'ABBATE EVALUATION OF CARVED LIGHTNING RIDGE BLACK OPAL HISTORICAL FOLKLORE-KOSMINSKI Trace Elements in Black Opal More on opal and cracking New information - Slovakian opal Porosity of some opaline siliceous materials The Role of water in the cracking of opal AN Historic document: the Occurrence of Opal at Lightning ridge and Grawin. An analysis of Opal Polymorphs: Opal-AG, Opal-AN and Opal-CT by NMR A Review of the mineralogical opal classification SYNTHETIC OPAL Trace Elements in Australian Opal-1 Historical opal literature - an extract from Dana's Mineralogy An Extract from the Thesis of Boris Chauvrie GILC and LMHC decisions for Hydrophane opal nomenclature Opal Historical SA Trade standards (1979) Opal Nomenclature - AG1997 The Story of European Precious opal from Dubnik The White Cliffs Opal Field, NSW ValuationAnthony SmallwoodOctober 12, 2023 Facebook0 Twitter Pinterest0 0 Likes