| 单词 | rhyodacite |
| 释义 | rhyodacite [rī`äd·ǝ´sīt] PETROLOGY A group of extrusive porphyritic igneous rocks containing quartz, plagioclase, and biotite phenocrysts in a fine-grained to glassy groundmass composed of alkali feldspar and silica minerals. Also known as dellenite; quartz lattice. |
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