Sandstone

Mention the word sand and many people will think of desert and beaches. They may also think of sandstone, a sedimentary rock that is made of grains of sand. Sandstone forms in a range of environments and is often used as a building stone.

Limestone

The remains of ancient creatures make up many types of limestone. Other varieties form when minerals precipitate out of water. All limestones. however, form where water is present and consist mainly of calcite. The main uses of limestone include building stone, cement, and fertilizers.