Pisolite

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A pisolite is a sedimentary rock formed from pisoliths. These are concretions - often of calcium carbonate, but commonly in rarer minerals - which resemble ooids. These grains are approximately spherical, and comprise concentric layers reaching 5-8 mm in diameter.

The name derives from the Hellenic word for pea. Bauxites, limonites and siderites often have a pisolitic structure.

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