Barite Visible Spectra (3-00 - 1100 nm)
Barite would be colorless if pure, but radiation-damage centers commonly
cause color. O- (in some blue crystals), SO3-
some honey-yellow and blue crystals), and SO2- (in
yellow crystals) centers have been identified in barite by Bartoshinsky et al. (1991)
Barite absorption spectrum
from Meikle Mine, Carlin, Nevada. Plotted as 20.0 mm thick. The spectrum
of this honey-yellow, mildely radioactive material shows weak bands near 435 nm ascribed to the SO2- ion color center
mentioned above. Data Files: E||a 19 K;
E||b 18 K; E||c
- barite spectrum; GRR 3243, from Stoneham, Weld County, Colorado. Plotted as 7.45 mm thick. The spectrum of this pale blue crystal shows bands near 604 and 629 nm with a weak component near 725 nm. This type of spectrum has been associated with an O- ion by Bartoshinsky et al (1991).
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Bartoshinsky VZ, Shumsky AA, Larikov AL, Dersky LS (1991) Paramagnetic
and optically active centers in barites of the Ukraine.
Mineralogicheskii Zhurnal 13, 73-78 (in Ukranian).
last revised: 29-Aug-2015