Hornblende Mica Schist Raman Spectra (2)

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Albite

Spot F: grey transparent crystal.

The Raman spectrum seems to be the addition of 2 minerals contributions: Albite and Muscovite. The peaks which could be attributed to Muscovite (including the wide fluorescence peak at 1040 cm-1) are marked with black arrows. On the image above, the shadow of some darker greenish crystals appears through the grey transparent albite. Due to the lack of z resolution of the Raman microscope, these crystals may contribute to the Raman spectrum.

G spot: another transparent crystal.

Spot G gives a pure Albite Raman spectrum. Due to changing crystals orientations, the spectrum here can be slightly different from the spot F spectrum.

Muscovite  Chlorite

Two different crystals have been selected from that image: Spot H is a brilliant mineral. Spot I is a dark green mineral which could at first glance be identified as hornblende although the shape is much more irregular.

The Raman spectrum from the brilliant crystal is muscoviteagain with an additional peak at 1040 cm-1.

Chlorite

The spot I Raman spectrum is quite similar to Chamosite, a chlorite group member.

Spot J has been chosen to be a representative crystal from the collection of small grey particles which appear throughout the thin section of this rock. At first glance, those crystals could be quartz.

The Raman spectra of this spot J particle and another similar crystal called spot K (picture not reproduced here) show that the clear transparent mineral is albite. Some of the Raman peaks intensities can be modified due to crystal orientation.

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