Definition
Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt
Oil Shale is a fine-grained sedimentary rock from which oil is extracted
History
Origin
Pike County, U.S
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Discoverer
Unknown
Unknown
Etymology
From the chemical and mineralogical composition of the upper mantle of the Earth
From Old English scealu in its base sense of thing that divides or separate
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