An oolite has a shell of concentric layers of calcium carbonate that precipitated around a nucleus or central core. The nucleus is usually a tiny brine shrimp fecal pellet or a mineral fragment. Oolites form in shallow, wave-agitated water, rolling along the lake bottom and gradually accumulating more and more layers.
In addition to the Great Salt Lake, oolites also form in Baffin Bay (Texas), the eastern Mediterranean Sea, the Persian Gulf, and the waters surrounding the Bahamas. Although oolitic sand is collected for its uniqueness, it has also been used to dry flowers and as flux in mining operations.