| 单词 | alum rock |
| 释义 | > as lemmasalum rock alum rock n. a kind of rock which contains substantial amounts of alum, esp. in the form of the mineral alunite; alum stone. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > mineral or chemical composition > [noun] > rock containing specific mineral alum rockc1637 silver-spat1668 salt-rock1670 tin-spar1681 garnet-rock1794 mimophyre1824 crystalline1856 haüynophyr1865 minette1866 phosphate rock1869 c1637 J. Fitz in 17th Cent. Econ. Documents (1972) 242 Asholme, one of the best and greatest alum rocks of mine. 1759 Philos. Trans. 1758 (Royal Soc.) 50 688 What we call allum-rock, a kind of black slate that may be taken up in flakes. 1875 R. Hunt & F. W. Rudler Ure's Dict. Arts (ed. 7) I. 111 At Whitby, the alum-rock. 1922 T. M. Lowry Inorg. Chem. xxxiv. 661 Potash alum..was prepared in Italy by roasting and extracting with water an alum rock containing alunite. 1993 J. Davis et al. Developing & Managing Community Water Supplies i. 15 In parts of West Africa ‘alum’ rock can be purchased in local markets. < as lemmas |
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