DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Red beryl crystals. Crystals of the red variety of the mineral gemstone beryl (beryllium aluminium silicate). The red colour is thought to be from manganese substituting for aluminium in the beryl structure. Red beryl is also known as red or scarlet emerald, or bixbite, a term no longer officially used as it can be confused with the similar mineral bixbyite. Gem-quality red beryl is extremely rare as it forms very small crystals. The largest faceted gemstones are less than three carats (600 milligrams) in size.
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