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The Gümüldür Fire Opal: Mode of Occurrence and Mineralogical Aspects
earth siences silica polymorphs rocks
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2011/3/22
Five types of silica polymorphs have been identified in dacitic volcanics from the Gümüldür region of western Anatolia, Turkey. Two of them are micro-quartz and disordered cristobalite (opal-C) that o...