Definition
Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt
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
History
Origin
Pike County, U.S
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Discoverer
Unknown
William Smith
Etymology
From the chemical and mineralogical composition of the upper mantle of the Earth
From the English mud and stone, from low German mudde and stainaz
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock
Family
Group
Plutonic
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Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock