Wulfenite Visible Spectra (380 - 1100 nm)
The wulfenite absorption spectrum
-  CIT 8181 spectrum of
a 0.205 mm, thick red 
 crystal from the 79 Mine Gila
Co., Arizona, looking down the
crystal face, where no obvious polarization was apparent.. Data File:  unpolarized; 
Link to references to wulfenite spectra data