Definition
Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite).
Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt
History
Origin
Brazil
Pike County, U.S
Discoverer
Unknown
Unknown
Etymology
from French néphéline, from Greek nephelē
From the chemical and mineralogical composition of the upper mantle of the Earth
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Plutonic
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock