| 单词 | quartzose graywacke |
| 释义 | quartzose graywacke [`kwȯrt´sōs `grā´wak·ǝ] PETROLOGY 1. A sandstone containing 50-85% quartz, chert, and metamorphic quartzite, 15-25% micas and micaceous metamorphic rock fragments, and 0-25% feldspars and feldspathic crystalline rock fragments. 2. A graywacke that has lost its micaceous constituents through abrasion and thus tends to approach an orthoquartzite. |
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