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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Szoenyi, Michael |
Bildgröße: | 4430 px × 2953 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |