adj. foreign; unusual; not natural to the substance in which it was found.
adj. Of or pertaining to the region just below the surface of the earth.
the GNU version of the Collaborative International Dictionary of English
adj. Foreign; unnatural; unusual; -- said of forms of crystals not natural to the substances in which they are found.
adj. Formed originating on the surface of the earth; -- opposed to hypogene.
The Century Dictionary and Cyclopedia
In geology, formed or originating on the surface of the earth: opposed to hypogene: as, epigene rocks.
In crystallography, foreign; unnatural; unusual: said of forms of crystals not natural to the substances in which they are found.
Word Usage
"As the molecule of spar is entirely different in form from the molecule of lime, the form of the crystal is not absolutely preserved, and there are observed on the edges of the epigene crystal certain grooves which correspond with a loss of substance."