Definition
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt
History
Origin
Pennsylvania, U.S.
Pike County, U.S
Discoverer
Unknown
Unknown
Etymology
From Greek anthrakites, from anthrax, anthrak meaning coal
From the chemical and mineralogical composition of the upper mantle of the Earth
Class
Metamorphic Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Plutonic
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock