Almandine crystals. Almandine is the iron-alumina variety of the garnet group of minerals. Its characteristic colour is a brownish red, though it can

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Almandine crystals. Almandine is the iron-alumina variety of the garnet group of minerals. Its characteristic colour is a brownish red, though it can tend towards purple and violet. It occurs in schists and other metamorphic rocks, often in the well-developed rhombic dodecahedral shapes, as seen here, with individual crystals the size of large marbles.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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