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 x20 at 35mm size | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Pasieka, Alfred |
Taille de l’image : | 5616 px × 3744 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |