Olivine

Olivine is a common mineral found in many types of igneous rocks, especially those formed deep within the Earth's mantle. It is composed primarily of the elements magnesium, iron, silicon, and oxygen, giving it a characteristic green color. Olivine has a crystalline structure that makes it durable and resistant to weathering, often appearing as small, granular grains in rocks like peridotite. Its presence provides important clues about the Earth's interior processes, as it forms under high temperatures and pressures. In addition, olivine is used in various industrial applications, including mineral supplements and refractory materials.