Pisolite
From Infogalactic: the planetary knowledge core
QEMSCAN mineral map of pisoids
A pisolite is a sedimentary rock made of pisoids, which are concretionary grains – often of calcium carbonate, but sometimes of rarer minerals – which resemble ooids but are always more than 2 mm in diameter. 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.
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