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
Latite is an igneous, volcanic rock, with aphanitic-aphyric to aphyric-porphyritic texture
From the Latin word latium
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock