25.6 MB (1.3 MB compressed)
3661 x 2441 pixels
31.0 x 20.6 cm ⏐ 12.2 x 8.1 in (300dpi)
DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Orthoclase and quartz crystals. Sample of rock containing orthoclase crystals (dirty white) interspersed with quartz crystals (dark transparent). Orthoclase, or adularia, is a type of feldspar (potassium aluminium silicate) and a major granite-forming mineral. Quartz is a form of silica (silicon dioxide). This specimen was found in the Sinai desert, Egypt. Actual width is 105 mm.
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