| Garnet |
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| Picture of a thick
section ( 100 to 200 µ) showing two big Garnet crystals. Raman
spectra has been taken at the position marked by the arrow. The Raman
spectrum is comparable to a Pyrope or Almandin spectrum found in the RRUFF Project database. |
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| The peak at 375 cm-1 is
absent in the Almandin spectrum. See also
absorption
spectrum of this Garnet. |
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Chloritoid |
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Two spectra have been recorded on this
green highly pleochroic crystal identified optically on the thin section
as chloritoid. Spectrum A was recorded on the spot indicated by red arrow on
the above picture . See also
absorption
spectrum of this Chloritoid |
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Spectrum B taken was taken on the spot marked by red
arrow. This picture and the following have been recorded with a
rotation of the polarizer by 90° to illustrate the pleochroism of
Chloritoid. |
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| The two spectra show clearly the
dependence of the Raman spectrum to crystal orientation. The spectrum B
should be recorded for the two section orientations to show the
differences in Raman spectra. |
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Talc |
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| The Talc present in this
rock section has been previously identified by crushing a small amount
of the rock. Crystals lying on their cleavage plane with an acute
bisectrix conoscopic figure and a low optic axis angle (< 30°) were
believed to be Talc. The Raman spectrum below is a proof of this
assumption. |
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| Raman spectrum
clearly identifies Talc on this rock section |
