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Luxullianite is a rare type of granite, known for presence of clusters of radially arranged acicular tourmaline crystals which are enclosed by phenocrysts of orthoclase and quartz in a matrix of quartz, tourmaline, alkali feldspar, brown mica.
From the village of Luxulyan in Cornwall, England, where this variety of granite is found
Coarse Grained Rock, Opaque Rock
A water-soluble mineral sediment resulting from concentration and crystallization by evaporation from an aqueous solution
From a sediment left after the evaporation
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock