Small polished crystal of Crocoite. The mineral Crocoite is certainly
a "star" of the Raman mineral scatterers with red light. For
shorter wavelength, the absorption of light should be much higher.
Even if the Laser line blocking filter is removed, it is still
possible to see the Raman spectrum. The exposure time necessary to get
an image on the CCD is so small that a continuously running spectrum can
be observed on the CCD so this mineral greatly helps the alignment of
the Raman microscope in particular to get the highest intensity. The
final spectrum above has not been baseline corrected, it is unnecessary.
The slit width is also 20µ.