Definition
Banded iron formation are distinctive units of sedimentary rock that are almost always of Precambrian age
Pegmatite rock is a holocrystalline, intrusive igneous rock which is composed of interlocking phaneritic crystals
History
Origin
Western Australia, Minnesota
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Discoverer
Johann Gottlob Lehmann
R. J. Hauy
Etymology
From its formation process
From Greek pegma, pegmat which means- thing joined together + -ite
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
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Plutonic
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock