Reflected light image of a large feldspar crystal
Raman spectra of feldspar (seems to be anorthoclase)
from this phonolithe section.
Mixed spectrum of feldspar and aenigmatite from spot
6 on page 1, first picture.
The dark mineral visible in thin section plane
polarized light which is believed to be Richterite, a calcium sodium
amphibole. It is mixed with the feldspar.
Reflection image of richterite (17).
Raman spectrum of Richterite (17) compared to
the reference in RRUFF database. The spectrum of spot 17 has additional
peaks and is thus not a pure Richterite crystal, it is mixed with
feldspar as shown by the red spectrum from pure feldspar.