Definition
Mudstone is a fine-grained, dark gray sedimentary rock, which is formed from silt and clay and is similar to shale but has less laminations
Peridotite is a dense, coarse-grained plutonic is the main constituent of the earth's mantle
History
Origin
-
Pike County, U.S
Discoverer
William Smith
Unknown
Etymology
From the English mud and stone, from low German mudde and stainaz
From French, from peridot + -ite
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock