pisolite
Sign in to savethumb|Pisoids in the Conococheague limestone (Upper Cambrian) of eastern Pennsylvania thumb|right|Pisolitic limestone; Itaboraí, Rio de Janeiro, Brazil; pisolith diameters average 1.0 cm thumb|right|QEMSCAN mineral map of bauxite forming pisoids
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thumb|Pisoids in the Conococheague limestone (Upper Cambrian) of eastern Pennsylvania thumb|right|Pisolitic limestone; Itaboraí, Rio de Janeiro, Brazil; pisolith diameters average 1.0 cm thumb|right|QEMSCAN mineral map of bauxite forming 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. These grains are approximately spherical and have concentric layers reaching 10 mm in diameter.