Ancient Roman columns. This shows several types of rock used to make architectural columns. In the foreground is fine-grained The colours in this column indicate different minerals in the matrix: quartz is white,plagioclase feldspar is grey and mica is black. Behind it is a far coarser-grained mineral,with travertine and marble behind that | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Szoenyi, Michael |
Taille de l’image : | 4430 px × 2953 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |