the world > the earth > earth sciences > geology > [noun] > petrology or petrography > petrogeny (4)
The formation of rocks, esp. igneous and metamorphic rocks. Also: the branch of geology concerned with this.
(a) the formation of calculi (New Sydenham Soc. Lexicon 1889); (b) Geology (rare) = lithogenesis n. above.
= petrogenesis, n. Frequently in petrogeny's residua system, a liquid system consisting of the molten oxides of aluminium, sodium, potassium, and…