Glossy paperback 1983 20 glossy pages. 11.60×8.10×0.15 WHAT IS OPAL?; VARIETIES; BLACK OPAL; BOULDER BLACK OPAL; LIGHT OPAL; AUSTRALIAN OPAL DEPOSITS; PUDDING and RUMBLING; OPEN-CUT MINING; NOODLING; FROM ROUGH TO GEM….
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Australian Opals and Gemstones, Nature’s Own Fireworks
Australian Opals and Gemstones, Nature's Own Fireworks
Australian Gem Industry Association
Australian Gem Industry Association
