Oolite

For the video game, see Oolite (video game).
Modern ooids from a beach on Joulter Cays, The Bahamas, with 0.5 mm scale
Ooids on the surface of a limestone; Carmel Formation (Middle Jurassic) of southern Utah
Thin-section of calcitic ooids from an oolite within the Carmel Formation (Middle Jurassic) of southern Utah

Oolite or oölite (from Ancient Greek ᾠόν (ōión) 'egg stone')[1] is a sedimentary rock formed from ooids, spherical grains composed of concentric layers.[2] Strictly, oolites consist of ooids of diameter 0.25–2 millimetres; rocks composed of ooids larger than 2 mm are called pisolites. The term oolith can refer to oolite or individual ooids.

  1. ^ A to Z of Rocks, Minerals and Gems. Quarto Publishing Group UK. 2020. ISBN 978-0-7112-5684-2.
  2. ^ "Oolite". Kansas Geological Survey. Retrieved October 8, 2021.