Pisolite
![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/23/PisolitesConococheagueUpperCambrian.jpg/220px-PisolitesConococheagueUpperCambrian.jpg)
Pisoids in the Conococheague limestone (Upper Cambrian) of eastern Pennsylvania
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8b/Calcario2EZ.jpg/220px-Calcario2EZ.jpg)
Pisolitic limestone; Itaboraí, Rio de Janeiro, Brazil; pisolith diameters average 1.0 cm
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Qemscan_pisoliths.png/220px-Qemscan_pisoliths.png)
QEMSCAN mineral map of pisoids
A pisolite 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.
The name derives from the Hellenic word for pea. Bauxites, limonites and siderites often have a pisolitic structure.
See also[]
References[]
Further reading[]
- Manutchehr-Danai, Mohsen (2009). Dictionary of gems and gemology (3rd ed.). Springer. ISBN 978-3-540-72795-8.
Categories:
- Sedimentary rocks
- Petrology stubs