calcilutite

Calcilutite is a consolidated lime mud. It is a type of sedimentary rock composed primarily of calcite, which is the most common form of calcium carbonate (CaCO₃). Calcite is a widely distributed mineral known for its diverse crystal structures.12

Calcrete, a related term, refers to a hardened layer in soil formed in arid and semiarid regions from calcium-rich materials. This occurs when calcite is dissolved in groundwater and then precipitated as the water evaporates at the surface.3

Calcite itself is a fundamental component of many rocks, including limestones, which make up a significant portion of marine sediments. It is also found in various other geological formations and has numerous uses, from cement production to ornamental stone.2