Pyroxenite (2).

Other view of the pyroxenite thin section dominated by the large orthopyroxene low birefringence  crystals. At the center of this picture, some high birefringence material appears. This material is not colorless in thick section (thus it is not olivine) but is green colored (see picture below crystals marked by arrows). The diagram below is the spectrum of these small green crystals. The high absorption peak appears at higher wavelength, above 1000 nm. This material is probably clinopyroxene. The green color of those crystals is produced by the peak at 650 nm which could be due to the presence of Cr3+.                                                 

 

 

Pyroxenite thick section (~200) with 2 green crystals of clinopyroxene

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