Definition
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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
Granulite is fine to medium grained metamorphic rock with a granular of polygonal crystals.
From Latin granulum, a little grain or fine grained
Coarse Grained Rock, Medium Grained Rock, Opaque Rock