IPA: /ˌdʒiːoʊˈkɛmɪkli/
KK: /dʒiːoʊˈkɛmɪkli/
In a way that relates to the study of the chemical composition and processes of the Earth.
The samples were analyzed geochemically to determine their mineral content.
Geochemically → It is formed from "geo-" (from Greek "gē", meaning earth) and "chemical" (from Greek "khēmeia", meaning the art of transmuting metals). The word "geochemically" refers to the chemical processes and substances that occur in the earth.
Think of 'geo' meaning 'earth' and 'chemical' relating to substances and processes — together, they help you remember that 'geochemically' involves the chemistry of the earth.