Moon or stone milk

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Among the calcareous formations, lunar or rock milk, which is a typical colloid, is particularly interesting. It covers the vaults and walls of caves in areas where water emerges from narrow cracks and in conditions of weak evaporation strongly liquefies the rock, which in appearance resembles lime dough, sour cream-like mass or stone milk of white color.

This very rare and not yet solved phenomenon of nature is noted in the Red (Crimea), Kizelovskaya (Urals), Anakopiyskaya (Caucasus) and some other caves of the Ukraine and Russia.