ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY
Crystal of colourless euclase (hydrous beryllium aluminium silicate). Euclase varies in colour from colourless to sea-green or blue and is occasionally used as a gemstone. The name euclase is derived from the Greek words for easiness and fracture, in reference to its easily-cleaved crystals. This specimen measures 8 x 4 cm and was found in Santana do Encoberto's Mine, Sao Sabastiao do Maranhao, Brazil.
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