EPIGENE
Adjective
epigene (not comparable)
(crystallography) Foreign; unusual; not natural to the substance in which it was found.
(mineralogy) Of or pertaining to the region just below the surface of the earth.
Source: Wiktionary
Ep"i*gene, a. Etym: [Pref. epi- + Gr.
1. (Crystallog.)
Definition: Foreign; unnatural; unusual; -- said of forms of crystals not
natural to the substances in which they are found.
2. (Geol.)
Definition: Formed originating on the surface of the earth; -- opposed to
hypogene; as, epigene rocks.
Source: Webster’s Unabridged Dictionary 1913 Edition