Pegmatite. Igneous rock, formed underground, with interlocking crystals usually larger than cm in size. Most pegmatites are found in sheets of rock near large masses of igneous rocks called batholiths. From Germany. Natural History Museum, Berlin, Germany.

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Keywords: crystal, crystalline, formed, fragment, geologic, geological, geology, igneous, intrusive, mineralogy, pegmatite, pegmatites, piece, rock, texture, underground