DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Porphyritic texture in an igneous rock. The large, isolated crystals consist of the feldspar mineral labradorite. These are held within dark, fine- grained igneous rock, or rock that has solidified from molten magma. This pattern of large mineral crystals within a matrix is known as porphyritic texture. This sample measures 100 millimetres across.
Model release not required. Property release not required.