You searched for: “chthonophagy
chthonophagia, chthonophagy (s) (noun) (no pl)
In pathology, the consumption of earth; Evidently there are some people in southern United States and in West India who suffer from the impulse to eat dirt and this urge or desire is termed chthonophagia.

Chthonophagia is a rarely used term for "geophagia" or "geophagy".