Desert varnish
Orange-to-black rock coating in arid environments
Desert varnish
Desert varnish or rock varnish is an orange-yellow to black coating found on exposed rock surfaces in arid environments. Desert varnish is approximately one micrometer thick and exhibits nanometer-scale layering. Rock rust and desert patina are other terms which are also used for the condition, but less often.
Read on Wikipedia · Image Mark Marathon, CC BY-SA 4.0
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