| 单词 | alum schist |
| 释义 | > as lemmasalum schist alum schist n. now chiefly historical = alum shale n. ΚΠ 1796 Repertory of Arts 4 4 To this liquor or saline matter is to be added a due proportion of alum schist, clay, or argillaceous matter. 1872 H. A. Nicholson Man. Palæontol. 513 Beds of so-called ‘alum-schist’, which are of Upper Cambrian age. 1921 J. A. Audley Silica & Silicates 337 Most of the alum manufactured in England was formerly made from alum shale, alum schist, and the like. 1997 G. M. Idorn Concrete Progress 21 He mentioned the Swedish production of a pozzolan by two-times calcination of an alum schist. < as lemmas |
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