Apatite: Origin of Blue Color

Science  20 Sep 1963:
Vol. 141, Issue 3586, pp. 1179-1180
DOI: 10.1126/science.141.3586.1179


The optical absorption and emission spectra of natural blue apatite are similar enough to spectra of synthetic compounds containing MnO4-3 to conclude that the blue color of natural apatite results from the presence of this ion.