One of the mysteries of the English language finally explained.
Petrogenesis. Frequently in "petrogeny's residua system", a liquid system consisting of the molten oxides of aluminium, sodium, potassium, and silicon which are the chief components of igneous rocks.
Late 19th century; earliest use found in Jethro Teall (1849–1924), geologist. From petro- + -geny.
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