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Ahhhhh. That's still a mystery! You will read in Wikpedia or some of the literature that it is water ice.

But actually, we don't know. It could be ice, or other things: frozen benzene, solid HCN, mixed solid organics. We do not have detailed spectra or other chemical analysis of those rocks vs the sands.

(Personally, I think it's probably ice, but I want better proof.)

(The dark sands I'd lean my guess towards probably organics.)

It is good to have mysteries! Fun! Explore!