
1) Igneous rock 2) Scientific modeling
Found on
https://www.crosswordclues.com/clue/pyrolite

Pyrolite is a theoretical rock considered to be the best approximation of the composition of Earth`s upper mantle. The definition varies, but it is generally considered as being 1 part tholeiitic basalt and 3 parts dunite. If fused experimentally, this mix yields high pressure tholeiitic basaltic melts, and intermediate pressure alkaline basalts.....
Found on
http://en.wikipedia.org/wiki/Pyrolite

rock consisting of about three parts peridotite and one part basalt. The name was coined to explain the chemical and mineralogic composition of the ...
Found on
http://www.britannica.com/eb/a-z/p/138
No exact match found.