Definition: Carrollite is a mineral that is commonly found in the Earth's crust. It is a type of calcium carbonate mineral and is named after British chemist H. D. A. Carroll, who first described it in 1946. The structure of Carrollite consists of a layered structure with two layers (or "layers") separated by a common interlayer. This structure allows the formation of strong bonding between the calcium ions and the carbon atoms within the crystal lattice. Carrollite