Luxullianite

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Luxullianite (also Luxulyanite, Luxulianite) is a rare type of granite, notable for the presence of clusters of radially arranged acicular tourmaline crystals enclosed by phenocrysts of orthoclase and quartz in a matrix of quartz, tourmaline, alkali feldspar, brown mica, and cassiterite.

The name originates from the village of Luxulyan in Cornwall.England, where this type of granite is found. An example may be seen in the Duke of Wellington's monument at St Paul's Cathedral in London.