Rhyolitic tuff, polarised light micrograph

Rhyolitic tuff, polarised light micrograph

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Credit: STEVE LOWRY/SCIENCE PHOTO LIBRARY

Caption: 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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Keywords: devon, feldspar, geological, geology, light micrograph, light microscope, microscope, polarised, polarised light, polarized, quartz, rhyolitic tuff, rock, tuff, volcanic

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