Definition
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.
Diabase is a fine-grained igneous rock which is composed mostly of pyroxene and feldspar
History
Origin
England
Germany
Discoverer
Unknown
Christian Leopold von Buch
Etymology
From the village of Luxulyan in Cornwall, England, where this variety of granite is found
From Greek di + base
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Plutonic
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock