Quartz-feldspar porphyry - stock photo
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Quartz-feldspar porphyry

Geological specimen collected by Scott's British Antarctic Expedition 1910-1913, also known as the Terra Nova expedition. It had a broad scientific programme and collected thousands of geological and zoological specimens. This is a form of igneous rock û created through the cooling of lava or magma û composed of large-grained crystals in a more finely grained material.

Credit
Mary Evans / Natural History Museum

Dimensions
3534 x 3223 pixels

Print Size @ 300 dpi
12 x 11 inches / 30 x 27 cm

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