* Limestone: Limestone is a sedimentary rock that is composed primarily of calcite. It is formed when calcium carbonate precipitates out of water and forms a solid rock. Limestone is often used as a building material, and it is also used to make cement.
* Marble: Marble is a metamorphic rock that is formed when limestone is subjected to high temperatures and pressures. This process causes the calcite in the limestone to recrystallize, forming a new rock that is harder and more durable than limestone. Marble is often used as a building material, and it is also used to make sculptures and other works of art.
* Travertine: Travertine is a sedimentary rock that is formed when calcium carbonate precipitates out of hot springs. It is a porous rock that is often used as a building material.
* Onyx: Onyx is a variety of calcite that is characterized by its banded appearance. It is often used to make jewelry and other decorative objects.
