Thin section of a pyroxenite coming from Malaga (Spain).
The section is mainly made up of big orthopyroxene
crystals. The region shown here exhibits higher birefrengence crystals,
colorless in non analyzed light.
This picture has been photographed with a Benford
plate (double quarter wave plates perpendicular to each other). The
black area at the center of the image is a hole in the section.
Below is the spectrum recorded on one of the big low
birefringence crystal. This spectrum is characteristic of orthopyroxenes
with a strong absorption at 900 nm due to Fe2+. This
absorption is sufficiently strong to be seen in a 30µ thickness section.