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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 3661 px × 2441 px |
Model Release : | Non requis |
Restrictions : | - |