单词	diatomite
释义	diatomite /dʌɪˈatəmʌɪt / noun [mass noun] Geology A fine-grained sedimentary rock formed from consolidated diatomaceous earth.Diatoms have an extensive fossil record going back to the Cretaceous; some rocks are formed almost entirely of fossil diatoms, and are known as diatomite or diatomaceous earth.... The richest sources of diatom fossils are deposits of their skeletons known as diatomite, or diatomaceous earth. By this time, both groups were abundant and diversified globally, so much so that diatomite is a common marine sediment of the Miocene. Origin Late 19th century: from diatom + -ite1.
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