STEVE LOWRY / SCIENCE PHOTO LIBRARY STEVE LOWRY / SCIENCE PHOTO LIBRARY
Polarised light micrograph of rhyolitic tuff from Withnoe, Devon, UK. Tuff is formed as a result of an explosive volcanic eruption. Rhyolitic tuffs contain glassy fragments, quartz, and alkaline feldspar. It is a relatively soft and easily worked stone and was used in the construction of the elaborate doorway at the entrance to the chapel at Colditz Castle. Magnification: x27 at 10cm wide.
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