Definition
Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
History
Origin
Pike County, U.S
Pennines, England
Discoverer
Unknown
J.J. Ferber
Etymology
From the chemical and mineralogical composition of the upper mantle of the Earth
From Grit + Stone
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