Definition
Banded iron formation are distinctive units of sedimentary rock that are almost always of Precambrian age
Boninite is a mafic extrusive rock which is high in magnesium and silica content, formed in fore-arc environments, typically during the early stages of subduction
History
Origin
Western Australia, Minnesota
Japan
Discoverer
Johann Gottlob Lehmann
Unknown
Etymology
From its formation process
From its occurrence in the Izu-Bonin arc south of Japan
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
-
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock