pyrogenous

[pahy-roj-uh-nuh s]

adjective Geology.

Origin of pyrogenous

First recorded in 1830–40; pyro- + -genous

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Pyrogenous oil of turpentine is another cheap and good solvent.
Cooley's Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades..., Sixth Edition, Volume I
Arnold Cooley
Gold is, however, much more common in the alluvial grounds than among the primitive and pyrogenous rocks just described.
A Dictionary of Arts, Manufactures and Mines
Andrew Ure
It is, however, much more common in alluvial grounds than among primitive and pyrogenous rocks.
The Continental Monthly, Vol 3 No 3, March 1863
Various