J.C. REVY, ISM / SCIENCE PHOTO LIBRARY J.C. REVY, ISM / SCIENCE PHOTO LIBRARY
Rubies embedded in another, unidentified mineral, photographed in ultraviolet light. Ruby is a red, transparent variety of the mineral corundum (aluminium oxide). Small amounts of chromium oxide, substituting for aluminium oxide, give it its red colour. Rubies are found in Burma, on the Malay Peninsula, and in Sri Lanka, Tanzania and Brazil. This specimen was found in Mysore, India. Natural rubies are highly prized as gemstones, but rubies can also be produced artificially, and such synthetic stones are used in lasers and watches. Compare with photo E425/483 which shows the same specimen photographed in normal light.
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