"Nature`s Fireworks" - A Beginner`s Guide to OPAL - Part 3 Australian Opal Fields
All of the significant opal deposits in Australia during the last 100 years are located within or surrounding the Great Artesian Basin. The most important deposits are found in New South Wales, South Australia and Queensland.
Today, mining is carried out at the following main areas and each area produces solid opal with specific characteristics and colour patterns.
Lightning Ridge, New South Wales
This is a town famous for its rich and rare black opal. Black opal gets its name from the colour of the ?nobbies? or pieces of rough opal in which the gems are usually found.
Black opal was first discovered here in the late 1880?s, however its commercial value was not at first recognised by buyers. It wwasn?t until the early 1900?s that some opal nobbies were found and shafts dug.
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Opal occurs either as ?nobbies? or in seams and thin layers within a soft greyish clay stone. The opal dirt levels occur between six and eighteen metres from the surface, but have been found at depthss as deep as thirty metres. The fields also yield opalised shells, wood and reptilian bones.
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