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The Occurrence of Opal at Lightning Ridge and Grawin, with Geological Notes on County Finch
Language: en
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Authors: J. W. Whiting
Categories: Geological surveys
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Gemstones and Their Origins
Language: en
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Gemstones and Their Origins

Authors: P.C. Keller
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Each gem deposit-whether of primary origin in the parent rocks; or secondary as alluvial placers in valley floors, river gravels, or the sand of oceanic shelves
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Authors: Geological Survey of New South Wales
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Bulletin
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Authors: Australia. Bureau of Mineral Resources, Geology and Geophysics
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Bulletin
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