英语词汇“rock varnish”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	rock varnish
释义	rock varnish rock varnish [′räk ‚vär·nəsh] (geology) A dark coating on rock surfaces exposed to the atmosphere. It is composed of about 30% manganese and iron oxides, up to 70% clay minerals, and over a dozen trace and rare-earth minerals. Although found in all terrestrial environments, it is mostly developed and best preserved in arid regions. Also know as desert varnish.
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