Definition
Banded iron formation are distinctive units of sedimentary rock that are almost always of Precambrian age
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
History
Origin
Western Australia, Minnesota
Germany
Discoverer
Johann Gottlob Lehmann
Christian Leopold von Buch
Etymology
From its formation process
From Latin glaber bare, smooth, bald
Class
Sedimentary Rocks
Igneous 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