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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 3417 px × 5125 px |
Model Release : | Non requis |
Restrictions : | - |