The bright interference colored material in
areas 1 and 2 is diopside. Spectrum 2 has additional features not
identified. Some small peaks coming from the glue are also present in
particular around 1600 cm-1.
The feldspars Anorthoclase and Labradorite have
been identified in spectra 3 and 5.
The highly pleochroic Biotite is present in areas
4 and 6.
Areas 6 and 7.
in area 6 is highly pleochroic as can be seen in the figure below.
Comparison of the Raman spectra of Enstatite and Ferrosilite.
Opaques minerals: kaersutite and magnetite areas 8 and 9.
As can be seen in
the picture above (transmission image between crossed polars), the
mineral in area 8 is not completely opaque but deep brown colored. The
spectrum on the left could be interpreted as kaersutite a brown
The dark well formed
crystal in area 9 is magnetite. The laser power in the blue
spectrum on the left has been reduced to avoid oxidation. Red curve is
recorded with the full power of the laser, it shows oxidation peaks.
Even with the reduced power, spectrum indicates some sign of oxidation
maybe present in the crystal before exposure to the laser.