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
History
Origin
England
Discoverer
Abraham Gottlob Werner
Etymology
From Old French esclate, from esclat (French éclat)
Class
Metamorphic Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Family
Group
-
Other Categories
Fine Grained Rock, Opaque Rock