= alum shale n.
| 单词 | θ5656 |
| 释义 | the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > slate > others (4) alum slate1675 = alum shale n. peach1778 Either of two types of rock found in tin mines, one predominantly chlorite (also green peach), the other (in full blue peach) a fine-grained… itacolumite1863 A granular, quartzose, talcomicaceous slate, sometimes flexible in thin slabs. itabirite1868 A quartzose iron-slate or iron-mica slate, consisting chiefly of alternate layers of quartz and specular iron ore. |
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