Desert Varnish｜沙漠漆皮：岩壁的黑褐色表面可以是後來長出的薄層，不是母岩本色

Desert varnish is a thin dark coating that develops on exposed rock surfaces and is compositionally distinct from the rock beneath it. National Park Service descriptions note that it commonly contains clay minerals together with iron and manganese oxides.

沙漠漆皮的形成機制與錳濃集過程仍有研究討論；並非所有黑色岩面塗層都是同一種 desert varnish。