Orthoclase crystals. Orthoclase, or adularia, (potassium aluminium silicate) is a type of feldspar, and a major granite-forming mineral. This specimen

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Orthoclase crystals. Orthoclase, or adularia, (potassium aluminium silicate) is a type of feldspar, and a major granite-forming mineral. This specimen measures 90mm long, and was found in Tavetsch Tal, in Graubunden, Switzerland.

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Size: 3417px × 5125px
Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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