Definition
Claystone is a fine-grained, dark gray to pink sedimentary rock which mainly consists of compacted and hardened clay
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
History
Origin
-
Pennsylvania, U.S.
Discoverer
Unknown
Unknown
Etymology
From English clay and stone as the rock contains more amount of clay
From Greek anthrakites, from anthrax, anthrak meaning coal
Class
Sedimentary Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock
Family
Group
-
-
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock