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One Of South Dakota's 'Most Unique Areas' Is A Striking, Under-The-Radar State Park Near Sioux Falls
These rock formations can soar up to 50 feet in certain locations, making for dramatic photos as they rise above the relatively flat landscape. Composed of Sioux quartzite, they're a vibrant ...
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Geological surveys shed light on the formation mystery of Uruguay's amethyst geodes
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 ...