Polarised light micrograph of a thin section of basalt,an igneous rock. In this image,large coloured crystals appear embedded in the fine-grained basalt matrix. Such crystals are known as phenocrysts. The size of a phenocryst depends on the rate at which it was cooled out of the magma; the larger the crystals the slower the process. Magnification x15 at 35mm size. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Pasieka, Alfred |
Bildgröße: | 5616 px × 3744 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |