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Homo erectus may have deliberately selected rocks embedded with fossils and crystals to craft their hand axes.

Geodes are not so pretty on the outside, but when cracked, they are beautiful on the inside. With a few materials from around the house, you can turn an ordinary egg into a geode. Materials ...

Amethyst is a violet variety of quartz that has been used as a gemstone for many centuries and is a key economic resource in northern Uruguay. Geodes are hollow rock formations often with quartz ...

Göttingen University researcher Fiorella Arduin Rode working in open pit mine of the study area, Los Catalanes mining district, northern Uruguay. Along with Ametista do Sul in southern Brazil, these ...

Geodes can be kind of ugly on the outside, but when cracked open, you can find something beautiful. Here's how to make your own. n 12 eggs n Water n Borax n Food coloring STEP 1: Crack each egg near ...