rock varnish

Noun

countable uncountable

A 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.

Japanese Meaning

大気にさらされた岩石表面に現れる暗色の被膜。主に粘土や酸化物からなり、成長が非常に遅い（千年あたり数マイクロメートル程度）の現象で、特に乾燥砂漠地域で見られる。

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Google Translation / DeepL Translation

研究チームは峡谷の岩面から、大気に露出した暗色の被膜（主に粘土と酸化物で構成され、千年でわずか数マイクロメートルしか成長しない）を採取した。

Details

Sense（1）

A 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.

rock varnishes

（ plural ）

Details

rock varnish

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