Definition
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
Diabase is a fine-grained igneous rock which is composed mostly of pyroxene and feldspar
History
Origin
Pennsylvania, U.S.
Germany
Discoverer
Unknown
Christian Leopold von Buch
Etymology
From Greek anthrakites, from anthrax, anthrak meaning coal
From Greek di + base
Class
Metamorphic Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Hard Rock
Family
Group
-
Volcanic
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock