Luxulyanite, thin section, LM

Luxulyanite, thin section, LM

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: Polarised light micrograph of a thin section of Luxulyanite, a very rare form of Tourmaline Granite. This sample is from Luxulyan in Cornwall where the name originates. Visible is quartz filled with tourmaline needles in a spherulitic arrangement, stars of thin needles radiating from a central point. A sample of its use a a ornamental stone is the Duke of Wellington's monument at St Paul's Cathedral in London. Actual size 3mm across.

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Keywords: cornwall, granite, light, luxulyan, luxulyanite, micrograph, needles, polarised, polarized, quartz, radiating, rock, spherulitic, thin section, tourmaline

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