Definition
Banded iron formation are distinctive units of sedimentary rock that are almost always of Precambrian age
Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite
History
Origin
Western Australia, Minnesota
Romania and Moldova, Europe
Discoverer
Johann Gottlob Lehmann
Unknown
Etymology
From its formation process
From Dacia, a province of the Roman Empire which lay between the Danube River and Carpathian Mountains where the rock was first described
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock
Family
Group
-
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock