单词 | lithic graywacke |
释义 | lithic graywacke [`lith·ik `grā´wak·ǝ] PETROLOGY A low-grade graywacke, that is, containing an abundance of unstable materials, especially a sandstone containing less than 75% quartz and chert, 15-75% detrital clay matrix, and more rock fragments than feldspar grains. |
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