Definition
Banded iron formation are distinctive units of sedimentary rock that are almost always of Precambrian age
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
History
Origin
Western Australia, Minnesota
Germany
Discoverer
Johann Gottlob Lehmann
Van Tooren
Etymology
From its formation process
From Greek tephra, ashes from Indo-European base, to burn
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
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock