# Pisolite

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{{short description|Sedimentary rock made of large grains, usually of calcium carbonate}}
thumb|Pisoids in the Conococheague limestone (Upper Cambrian) of eastern Pennsylvania
[[Image:Calcario2EZ.jpg|thumb|right|Pisolitic limestone; [Itaboraí](/source/Itabora%C3%AD), [Rio de Janeiro](/source/Rio_de_Janeiro_(state)), Brazil; pisolith diameters average 1.0 cm]]
[[Image:Qemscan_pisoliths.png|thumb|right|[QEMSCAN](/source/QEMSCAN) mineral map of bauxite forming pisoids]]

A '''pisolite''' ({{ety|grc|''πίσον'' (píson)|[pea](/source/pea)}}) is a [sedimentary rock](/source/sedimentary_rock) made of '''pisoids''', which are [concretion](/source/concretion)ary grains – typically of [calcium carbonate](/source/calcium_carbonate) which resemble [ooid](/source/ooid)s, but are more than 2&nbsp;mm in diameter.<ref>[http://www.mindat.org/min-26778.html Mindat - Pisolite]</ref> These grains are [approximately spherical](/source/Spheroid) and have concentric layers reaching 10&nbsp;mm in diameter.

[Bauxite](/source/Bauxite)s, [limonite](/source/limonite)s, and [siderite](/source/siderite)s often have a pisolitic structure.

==See also==
* [Ooid](/source/Ooid)
* [Oolite](/source/Oolite)

==References==
{{Reflist}}

==Further reading==
*{{cite book |last1=Manutchehr-Danai |first1=Mohsen |title=Dictionary of gems and gemology |date=2009 |publisher=Springer |isbn=978-3-540-72795-8 |edition=3rd}}

{{Authority control}}

Category:Sedimentary rocks

{{sedimentary-rock-stub}}

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