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Moqui Marbles (also known as Sandstone-Iron Concretions) are balls of sandstone that have been surrounded by metals inside the earth, and are broken loose from surrounding rock as it erodes away.You can see fields of these throughout the Colorado Plateau in Navajo Sandstone layer. Zion National Park, Utah<br />
To see more Fine Art Sandstone photos, please check out my Sandstone Album!