Definition
Banded iron formation are distinctive units of sedimentary rock that are almost always of Precambrian age
It is a metamorphic magnesium rich rock because it is composed of the mineral talc
History
Origin
Western Australia, Minnesota
USA
Discoverer
Johann Gottlob Lehmann
Unknown
Etymology
From its formation process
From 17th century, because of its greasy feel and use like a soap
Class
Sedimentary Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock
Family
Group
-
-
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock