Trace Elements in Black Opal

Bruce Dickson asks some questions about the inclusion of Trace Elements in Lightning Ridge Black opal

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Chemistry Techniques used in researching opal - Neville Curtis

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A discussion on Ethiopian Opal from our french colleagues.

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The Origin of Digit patterns

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EVALUATION OF CARVED LIGHTNING RIDGE BLACK OPAL

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Trace Elements in Black Opal

Trace Elements in Black Opal

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More on opal and cracking

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New information - Slovakian opal

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Porosity of some opaline siliceous materials

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The Role of water in the cracking of opal

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AN Historic document: the Occurrence of Opal at Lightning ridge and Grawin.

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An analysis of Opal Polymorphs: Opal-AG, Opal-AN and Opal-CT by NMR

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A Review of the mineralogical opal classification

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Trace Elements in Australian Opal-1

Trace Elements in Australian Opal-1

Historical opal literature - an extract from Dana's Mineralogy

Historical opal literature - an extract from Dana's Mineralogy

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An Extract from the Thesis of Boris Chauvrie

GILC and LMHC decisions for Hydrophane opal nomenclature

GILC and LMHC decisions for Hydrophane opal nomenclature

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Opal Historical SA Trade standards (1979)

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Opal Nomenclature - AG1997

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The Story of European Precious opal from Dubnik

The White Cliffs Opal Field, NSW

The White Cliffs Opal Field, NSW

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