desert varnish


noun

the dark, lustrous coating or crust, usually of manganese and iron oxides, that forms on rocks, pebbles, etc., when exposed to weathering in the desert.

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Also called desert polish.

Origin of desert varnish

First recorded in 1900–05

Words nearby desert varnish

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020