ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY
Crystals of chrysoberyl (beryllium aluminium oxide). Chrysoberyl occurs in a range of colours including green, yellow, grey, brown and colourless. A variety known as alexandrite is red in artificial light but dark green in natural light and, along with the colourless variety, is highly prized as a gemstone. This specimen measures 5.5 x 5.5 cm and was found in Santa Tereza, Espirito Santo, Brazil.
Model release not required. Property release not required.