Geodes are hollow rock formations often with quartz crystals ... More information: Fiorella Arduin-Rode et al, World-class amethyst-agate geodes from Los Catalanes, Northern Uruguay: genetic ...
Liquid-filled rocks form when minerals trap fluids, but depending on their composition they can either be classed as enhydros, enhydro agates, or fluid inclusions. An enhydro is a hollow nodule that ...
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