| 单词 | alum ore |
| 释义 | > as lemmasalum ore alum ore n. now historical an iron ore or iron-rich rock which contains substantial amounts of alum; spec. = alum shale n. ΘΚΠ the world > the earth > minerals > ore > [noun] > metal ore > alum ore alum earth1612 alum slate1675 alum ore1725 bing1815 1725 P. Shaw Philos. Wks. R. Boyle III. 685 Alum-ore robb'd, regains its salt in the air. 1829 London Encycl. I. 706/1 Bituminous alum ore is called shale, and is in the form of a schistus, impregnated with so much oily matter, or bitumen, as to be inflammable. 1880 R. V. Tuson Cooley's Cycl. Pract. Receipts (ed. 6) 106/1 The manufacture of alum is technically said to be conducted according to the natural process when prepared from alum: schist or alum-ore. 1919 Farm Knowl. (rev. ed.) IV. ii. xii. 187 The acid of alum powders is made from a kind of clay called alum ore. 2005 E. Cameron Interpreting Christian Hist. iii. 121 A prospector discovered alum ore (vital for the cloth industry) near Tolfa in the papal states, and allowed Western Europe to buy its alum from the pope rather than the Turks. < as lemmas |
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