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
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
History
Origin
England
Pennines, England
Discoverer
Abraham Gottlob Werner
J.J. Ferber
Etymology
From Old French esclate, from esclat (French éclat)
From Grit + Stone
Class
Metamorphic Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
-
-
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock