Calcite (noun)

1. A mineral, calcium carbonate, that is the most common form of natural calcium carbonate (as in limestone and marble) and is also found in many types of rocks and in some soils and sediments.
2. A mineral that is made up of calcium, carbon and oxygen and is found in many types of rocks, and is also found in some soils and sediments.

Origin:

From latin calx, calc- lime, from calcare to tread, from calx heel.

Examples:

1. The limestone is composed mostly of calcite.
2. The marble is formed from metamorphosed limestone, composed mostly of calcite.
3. Calcite is a common mineral found in many types of rocks.
4. Calcite is a common component of soils and sediments.
5. Calcite is a mineral that is made up of calcium, carbon and oxygen.