title: Ionium dating of igneous rocks.
abstract: Local fractionation of uranium and thorium, between minerals within a sample of igneous rock at the time of crystallization, makes it possible to date its solidification by use of ionium and uranium. Results on samples of granite, pumice, and lava suggest that this method of dating is reliable.
authors.forename: K
authors.initials: K
authors.lastname: Kigoshi