ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY ROBERTO DE GUGLIEMO / SCIENCE PHOTO LIBRARY
Crystals of spessartite (orange) growing on an aggregate of albite crystals. Spessartite (manganese aluminium silicate) is one of several varieties of garnet. It varies in colour from yellowish-orange to reddish-violet and is used as a gemstone. Albite (sodium aluminium silicate) is colourless or white and forms two different types of crystal; the prismatic variety seen here (known as pericline) and a lamellar (plate-like) variety (known as cleavelandite). This specimen measures 4 x 4 cm and was found in Pedra Bonita's Mine, Carnauba dos Dantas, Brazil.
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