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Above: plane polarized reflection, below: same with oblique illumination
reflection. Mineral 12 is feldspar oligoclase, mineral 11 is calcite.
See the bireflectance of the calcite (11) above. |
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| Raman spectra of oligoclase at 532 and 633 nm. |
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Calcite
|
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| Calcite on the transparent section. Picture below
illustrates the high fluorescence of this calcite material with the
green laser. The Raman edge filter is in place. The orange light coming
from spot 11 b is fluorescence. It illuminates the whole section. |
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| Raman spectra of calcite with both lasers. The same
vibrational information can be obtained but the signal to
background ratio is much better with the Helium-Neon laser. |
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