in natural history, the name of a genus of crystals, consisting of such as are composed of many angles. The word is derived from παγος, numerous, and γωνια, an angle or bending. The bodies of this genus are single-pointed or imperfect crystals, composed of dodecahedral or twelve-planed columns, terminated by twelve-planed pyramids, and the whole body therefore made up of twenty-four planes. Of this genus there are only three known species.