Porphyritic texture in an igneous rock

Porphyritic texture in an igneous rock

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: 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.

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Keywords: crystal, crystals, earth science, feldspar, feldspars, geological, geology, igneous, labradorite, mineral, mineralogy, minerals, porphyritic, porphyry, rock, rocks, stone, texture

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