NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Quartz-feldspar porphyry. Geological specimen collected during Scott's British Antarctic Expedition 1910-1913 (also known as the Terra Nova expedition). This is a form of igneous rock - created through the cooling of lava or magma - composed of large-grained crystals in a more finely grained material.
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