1 Definition
1.1 Definition
Harzburgite is a plutonic rock of the peridotite group consisting largely of orthopyroxene and olivine
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.
1.2 History
1.2.1 Origin
1.2.2 Discoverer
1.3 Etymology
From the name of a town in Harzburg, Germany
From the village of Luxulyan in Cornwall, England, where this variety of granite is found
1.4 Class
Igneous Rocks
Igneous Rocks
1.4.1 Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
1.2 Family
1.2.1 Group
1.3 Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock