VAUGHAN FLEMING / SCIENCE PHOTO LIBRARY VAUGHAN FLEMING / SCIENCE PHOTO LIBRARY
Image of a synthetic boule of sapphire which is a variety of the corundum mineral. It is made of aluminium oxide and it is produced artificially for use in high strength, heat resistant composite materials. Corundum is found as an accessory mineral in the crystalline rocks such as crystalline limestones and dolomites as well as in the igneous rock types granite and syenite.
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