The River Rio Uruguay is forming the frontier between three southamerican staates: Uruguay, Brazil and Argentina. In some gravel pits at the argentinian banks of the Rio Uruguay river, long distance transported alluvial agates can be found. Some agates ar not only edge-smoothened - they even look as they were being polished by the fine sediments in the river. The most beautiful agate nodules are reaching a size of 12 cm in diameter. Their pattern is showing more evidences for the long transportation: secondary colorization by iron-pigments and bleaching by humidous acid.
Besides fine banded agates a lot of different jasper-like formations (similar to conglomerats, pointed varieties and many more), mossy-like and plume-agates and petrified wood can be found here too.
collectors specimen from this location are offered Riccardo and Claudia Birnie at www.rexpler.com.ar
|