Colors: Purple, Blue, White
Found in: Western Desert
Geodes, like topaz, are a result of volcanic activity. Pockets of gas are trapped inside cooling volcanic material, creating hollow spheres which eventually fill with mineral-rich groundwater and coat the inside with crystals. Utah’s geodes are often a few inches in diameter and the brownish-gray shell contains white, purple, blue and occasionally pink crystals. To crack open a geode, place the rock inside a cloth sack to avoid flying shards and hit it swiftly with a hammer or large rock.