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
Charnockite is a variety of granite containing minerals like orthopyroxene, quartz, and feldspar
History
Origin
England
Tamil Nadu, India
Discoverer
Abraham Gottlob Werner
T. H. Holland
Etymology
From Old French esclate, from esclat (French éclat)
From Job Charnock, an administtrator of East India Company
Class
Metamorphic Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
-
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock