title: Apatite: Origin of Blue Color.
abstract: The optical absorption and emission spectra of natural blue apatite are similar enough to spectra of synthetic compounds containing MnO(4)(-3) to conclude that the blue color of natural apatite results from the presence of this ion.
authors.forename: P D
authors.initials: PD
authors.lastname: Johnson
authors.forename: J S
authors.initials: JS
authors.lastname: Prener
authors.forename: J D
authors.initials: JD
authors.lastname: Kingsley