olith
Olith, also known as oolite or oölite, is a sedimentary rock. It is composed of spherical, or near-spherical, grains called ooids. These ooids are typically formed by the precipitation of calcium carbonate around a nucleus, such as a shell fragment or a grain of sand. The grains grow outwards in concentric layers, similar to the growth of an onion. This process usually occurs in shallow, agitated marine waters where the ooids are kept in constant motion by wave and current action, allowing for even coating.
Oliths are often found in association with other carbonate rocks and can form extensive deposits. The color