The Leica 35mm f/1.4 Summilux-M is a very impressive lens: it is devoid of lateral chromatic aberration, it is very sharp and contrasty wide open (relatively speaking), and by f/2 it seems largely aberration-free. Run out and get one if you’re an M shooter.
Geologist Edo V writes:
Striations are scratches into rock surfaces, made by ice (containing rocks), or inside rocks on fault planes (strict geological use of the word). I do not see them in your photo.
The orange and gray bands run down the dip of the rock surface and are probably due to water run-off (melting snow?).
The two bands that run nearly vertical in the photo are intruded sheets (dikes) of late-stage magma, probably aplitic dikes.
The NW-SE bands in the photo are edges of exfoliation sheets, layers of granite that peel off due to repeated expansion and shrinkage with temperature variations and freezing.
You are in good company. Ansel Adams has photo of a rock surface with magmatic inclusions, with dark rims which he described as shadows, but they seem to be magmatic selvedges, which are rims of dark minerals that surround the magmatic inclusions, foreign rocks which sink into a magmatic chamber from the roof of an intrusion. (I do not have the photo at hand, and may be wrong here).
DIGLLOYD: I used the word “striation” generically. However, there do appear to be extensive glacial striations in the foreground of this photo. And more intruded dikes in this photo and this photo. And here is exfoliating granite. Finally, yes, the orange and gray bands are absolutely due to water runoff.