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单词 greywacke-slate
释义

greywacke /grā-wakˈə or -wakˈi/ (geology)

noun

An indurated sedimentary rock composed of grains (round or angular) and splinters of quartz, feldspar, slate, etc in a hard matrix

ORIGIN: Ger Grauwacke, partly translated, partly adopted

greywacke-slateˈ noun

A fine-grained fissile greywacke

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