Definition
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
History
Origin
Germany
Pennsylvania, U.S.
Discoverer
Christian Leopold von Buch
Unknown
Etymology
From Latin glaber bare, smooth, bald
From Greek anthrakites, from anthrax, anthrak meaning coal
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard 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