Ooid
spherical sedimentary grains
An ooid is a small rounded sedimentary rock. Like sand grains, ooids have a diameter of 2 mm or less. Larger grains formed the same way as ooids are called pisoids. Rock made of ooids is oolite.[1]
References
change- ↑ "Ooid Sand - Sandatlas". www.sandatlas.org. Retrieved 2022-04-16.