Rock varnish

Noun

Word Frequency: 0.0

Definitions

1.NounA dark coating on rock surfaces exposed to the atmosphere, mostly comprising clay and oxides, which grows at only a few micrometers per thousand years; found especially in arid deserts.

Synonyms

desert varnish rockwork ozokerit gossan ozokerite rock rimrock rock soap rockallite woodrock coal rank ozocerite

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