Topaz Visible Spectra (350 - 1250 nm)
Topaz, Al2(SiO4)F2 can
be naturally blue, pink, and various shades of brown or amber. Most
blue topaz on the market
has been artifically colored with irradiation. The pink color comes
from Cr3+ and the amber and brown colors come
from radiation damage. You can view a suite of crystals
ranging from the natural colorless, irradiated brown, and irradiated
plus heat-treated blue.
Image of the topaz absorption spectrum
Natural brown topaz
topaz, GRR 515 from Topaz Mountain, Utah. Natural color.
plotted as 7.0 mm thick. Data files: Alpha. Beta.
Naturally blue topaz
Irradiated blue topaz
Chromium-containing pink topaz
pink topaz GRR 1393 from Katlang, Khyber Pakhtunkhwa
Province, Pakistan, 4.41 mm thick.
- violet topaz, 300 - 2200 nm;
expanded visible region 300 - 900 nm from Bobrovka,
Ural Mountains, Russia, 3.0 mm thick, with Cr2O3=0.36,
FeO=0.03, MnO=0.02. Contributed data files from MN Taran,
to the list of minerals
to the Index of Data Files
Mineral Spectroscopy home page