Definition
Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers called coal beds
History
Origin
Pike County, U.S
USA
Discoverer
Unknown
John Peter Salley
Etymology
From the chemical and mineralogical composition of the upper mantle of the Earth
From the Old English term col, which has meant mineral of fossilized carbon since the 13th century
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock
Family
Group
Plutonic
-
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock