Definition
Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt
Arkose is a sedimentary rock, specifically a type of sandstone containing at least 25% feldspar
History
Origin
Pike County, U.S
France
Discoverer
Unknown
Alexandre Brongniart
Etymology
From the chemical and mineralogical composition of the upper mantle of the Earth
From Auvergne region of France used by a French geologist Alexandre Brongniart in 1826 who applied this term to some feldspathic sandstones
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Plutonic
-
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock