Definition
Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism
Banded iron formation are distinctive units of sedimentary rock that are almost always of Precambrian age
History
Origin
England
Western Australia, Minnesota
Discoverer
Abraham Gottlob Werner
Johann Gottlob Lehmann
Etymology
From Old French esclate, from esclat (French éclat)
From its formation process
Class
Metamorphic Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
-
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock