title: Pisolite
text: # Pisolite
  
  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. These grains are approximately spherical and have concentric layers reaching 10 mm in diameter.
  
  Bauxites, limonites, and siderites often have a pisolitic structure.
  
  