I realise that they call the images on the mission server ‘Raw’ but these are not raw images, but automatically processed images by JPL or ASU, and then placed on the server. All those images need to be properly calibrated before being used for science. Many of the green hues we see on these images are likely associated with the Bayer filter on the CCDs used in the colour cameras for the mars missions. The way it was explained to me is that they all use RGGB Bayer filters i.e. an array of red, green and blue sensors, but note that there are two letter “G’s” in the ‘RGGB’, this means the CCD has a grid composed of 50% green sensors, 25% red and 25% blue. This leads to an over saturation of green in most of the colour images. There may well be amounts of green materials (eg olivine) in some abrasion patches that are imaged using the white LEDs after sunset, but when you see the calibrated images in science papers etc there is far less green. I’ll see if I can find links to the PDF’s that show calibrated close ups of abraded patches :)