Polarised light micrograph of a thin section of quartz porphyry,a type of igneous rock. Essential mineral components include quartz,alkaline feldspar and biotite. The large coloured crystals visible here are of quartz and feldspar. Large crystals,like these,embedded in a fine grained matrix are known as phenocrysts. The rock is used for building and decoration,as well as for roadbeds,ballast,grindstones and gravel. Magnification: x11 at 6x6cm size | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Pasieka, Alfred |
Bildgröße: | 4091 px × 4068 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |