tailieunhanh - The Gümüldür fire opal: Mode of occurrence and mineralogical aspects

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 occur within the groundmass of the dacitic volcanic rocks. | The Gümüldür fire opal: Mode of occurrence and mineralogical aspects

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