Septarian nodule. This is a round mineral deposit of claystone (grey) filled with cracks formed when the claystone dried up. These cracks fill with other minerals,often calcite,a form of calcium carbonate. The variety of patterns that can form are often prized for their beauty. This specimen,from the Appenine mountains,Italy,measures 350 millimetres in diameter | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 4983 px × 3942 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |