Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
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