A Field Guide to Australian Opals
"Written especially for the opal collector and gemmology student, as well as for the opal miner or visitor to the opal fields, this bokk names every recorded opal deposit in Australia and pinpoints every location on concise geologial maps. The text claifies in understandable terms the many mioneralogical, gemmological, and commercial complexities of the opal gemstone and explains the scientific factors involved in opal formation." - book jacket.
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Why Opals Have Such Colours
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Abanderada Andamooka opal array black opal blue boulder opal cabochon Chequerboard colour play colour units Coober Pedy cracks Cretaceous crosses 1 cm crystal opal Cunnamulla developed diffraction Duck Creek Eromanga fiery fire opal Fishscale flag harlequin flash pattern form of opal fossil gem opal gemstone green Gregory Sherman collection harlequin opal Hayricks hexagonal Hill Index infilled irisations ironstone ironstone concretions kilometres layer light opal Lightning Ridge metres Mexican Mineral Field Mintabie Mount noble opal occur opal deposits opal exhibiting opal mining Opal Occurrence opal patterns Opal Prospect opal showing opal-in-matrix opal-mining opalised Opalton Parramatta particles pattern in black pieces pinfire play of colour potch precious opal precious stone prospector Queensland opal rocks sandstone Scale sedimentary shaft silica solid opal South Australia South Wales specimen spheres star opal Sydney Tintenbar Totterdell collection value of opal volcanic opal western Queensland White Cliffs white opal Wollaston Yowah