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Hydrothermal Breccia. picture took during geological fieldwork of an outcrop of hydrothermal breccia at the Cloghleagh Iron Mine county Wicklow Ireland near ' ' UTM The hydrothermal breccia is about million years old determined by Ar dating en Danmichaelo Diamonddavej en Diamonddavej Original upload log page en HydrothermalBreccia