Definition
Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt
Greywacke is defined as a dark coarse-grained sandstone rock which contains more than 15 per cent clay
Origin
Pike County, U.S
-
Discoverer
Unknown
Unknown
Etymology
From the chemical and mineralogical composition of the upper mantle of the Earth
From German Grauwacke, from grau grey + wacke
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock