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