- any dark sandstone or grit having a matrix of clay minerals
单词 | greywacke |
释义 | WordReference Random House Unabridged Dictionary of American English © 2024 grey•wacke (grā′wak′, -wak′ə),USA pronunciation n.
Collins Concise English Dictionary © HarperCollins Publishers:: greywacke, US graywacke /ˈɡreɪˌwækə/ n
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