Last Updated
：2025/11/21
rock varnish
Noun
countable
uncountable
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。
（ plural ）
Quizzes for review
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.
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rock varnish
The team sampled rock varnish from the canyon face, knowing that this dark, clay- and oxide-rich coating grows by only a few micrometers every thousand years.
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The team sampled rock varnish from the canyon face, knowing that this dark, clay- and oxide-rich coating grows by only a few micrometers every thousand years.
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