Epigene
Epigene , adjective
[Prefix epi- + Greek gi`gnesqai to be born, grow.]
1.
(Crystallography) Foreign; unnatural; unusual; -- said of forms of crystals not natural to the substances in which they are found.
2.
(Geology) Formed originating on the surface of the earth; -- opposed to hypogene; as, epigene rocks.