Grainstone

Grainstone is a type of limestone characterized by its high content of grains, primarily made up of tiny marine fossils, shells, and sand-sized particles. It forms in warm, shallow sea environments where there is plenty of biological activity. The grains are often visible to the naked eye, giving grainstone a sandy appearance. Used in construction and decoration, it is valued for its durability and aesthetic appeal. Understanding grainstone helps geologists and builders recognize the conditions under which these rocks form, contributing to insights about Earth's history and natural processes.