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Biotitdacit Dunabogdny. Biotite dacite from Dunabogdny Hungary This rock is of Miocene age formed million years ago This rock is on display at the Hungarian rocks collection at Hegyest geopark Hungary felszn alatt cip formjban lakkolit megrekedt grntos biotitdacit holdvilgrki dacittufa formci csdihegyi dacit tagozat miocn milli