Pisolite

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File:PisolitesConococheagueUpperCambrian.jpg
Pisoids in the Conococheague limestone (Upper Cambrian) of eastern Pennsylvania
File:Calcario2EZ.jpg
Pisolitic limestone; Itaboraí, Rio de Janeiro, Brazil; pisolith diameters average 1.0 cm
File:Qemscan pisoliths.png
QEMSCAN mineral map of bauxite forming pisoids

A pisolite (from Ancient Greek πίσον (píson) 'pea') is a sedimentary rock made of pisoids, which are concretionary grains – typically of calcium carbonate which resemble ooids, but are more than 2 mm in diameter.[1] These grains are approximately spherical and have concentric layers reaching 10 mm in diameter.

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

See also

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References

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  1. ^ Mindat - Pisolite

Further reading

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