Definition
Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt
Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase
History
Origin
Pike County, U.S
Finland, Europe
Discoverer
Unknown
Jakob Sederholm
Etymology
From the chemical and mineralogical composition of the upper mantle of the Earth
From Finnish Rapakivi which stands for crumbly rock
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Plutonic
Plutonic
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock