petrogeny
/pɪˈtrɒdʒɪni/ /pɪˈtrɒdʒ(ə)ni/Geology
noun
= 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.
Origin
Late 19th century; earliest use found in Jethro Teall (1849–1924), geologist. From petro- + -geny.