Errata!
Having written all that, I then went back and re-read the filter wavelengths.
For the right lens, R1 is not blank, but is a high-pass UV, and the other R2-R7 are all IR, not UV!
Left lens, L1 IS blank, but is seldom selected. L7 is the same as R1. L2 is the same NIR as R2. L3 is marginal IR, L4-L6 is the visible spectrum.
So I haven't actually measured UV response in any of those images. The Right lens view is different shades of IR. In a sense, the colours are reversed here and the rocks should be "red" due to increasing reflectance towards the farthest IR. My "UV vs Vis" is actually UV as red, Mid IR as green and far IR as blue (!)
Moral of the story, don't stay up late playing with colours!