ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY
Heliodor, a yellow-hued variety of beryl (beryllium aluminium sillicate) also known as golden beryl. Beryl occurs in many colours including grayish-white, yellowish-white, pale bluish-green and, more rarely, transparent yellow (heliodor), pink (morganite), blue (aquamarine) and green (emerald). The rare, transparent varieties are used as gemstones, while the more common types form the principal ore of the metal beryllium, which is widely used in industrial alloys. This specimen measures 8.5 x 7 cm and was found in Sapucaia's Mine, Divino das Laranjeiras, Brazil.
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