Luminescence emission spectra at 20° C. and at —196° C. of hackmanite, other natural sodalites, and certain synthetic, sulfur-containing sodalites are nearly identical. The luminescence of these sodalites is very closely related to that of scapolite and of a sodium polysulfide-sulfate mixture. From this similarity of the emission spectra and from the known occurrence of sulfur in sodalite and scapolite, it is concluded that the orange-yellow luminescence of sodalite and the yellow luminescence of scapolite are due to the presence of sodium polysulfide.

Hackmanite from Bancroft, Ontario, exhibits, on exposure to 1850 Å ultraviolet, a slow-bleaching blue coloration, in addition to the red-purple coloration described in earlier literature.

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