Ancient Roman columns. This shows two types of rock used to make architectural columns. At right is a very coarse-grained granite,while at left is a far finer-grained one. The colours in the column at right indicate different minerals in the matrix: quartz is white,plagioclase feldspar is grey and mica is black | |
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 : | - |