A pisolite () is a sedimentary rock made of pisoids, which are concretionary grains – typically of calcium carbonate which resemble ooids, but are more than 2mm in diameter. These grains are approximately spherical and have concentric layers reaching 10mm in diameter.

Bauxites, limonites, and siderites often have a pisolitic structure.

See also

• Ooid

• Oolite

References

Further reading