Definition
Banded iron formation are distinctive units of sedimentary rock that are almost always of Precambrian age
Ignimbrite is a volcanic rock consisting mainly of pumice fragments, formed by the consolidation of material deposited by pyroclastic flows
History
Origin
Western Australia, Minnesota
New Zealand
Discoverer
Johann Gottlob Lehmann
Patrick Marshall
Etymology
From its formation process
From Latin ignis fire + imber, imbr- shower of rain, storm cloud + -ite
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock