Any of various hard sedimentary rocks which contain a high proportion of iron compounds; rock from which iron can be smelted, iron ore.
| 单词 | θ6399 |
| 释义 | the world > the earth > minerals > ore > [noun] > metal ore > iron ore > hard (9) ironstone1522 Any of various hard sedimentary rocks which contain a high proportion of iron compounds; rock from which iron can be smelted, iron ore. mine-stone1612 ore, esp. iron ore. dogger1670 Originally Scottish and English regional. A kind of ironstone commonly found in globular concretions; a nodule of this; = cat-head, n. 2. Now rare. gubbin1712 A kind of ironstone. Also gubbin bat (bat, n.2 12), gubbin iron (gubbin stone). iron clay1750 Geology. Ironstone containing much clay. Also: clay rich in iron oxide. Frequently attributive. small balls1793 a variety of ironstone. penny-stone1803 A kind of ironstone occurring in nodules in the Shropshire coalfield. mine-stuff1839 = mine-stone n. silver thread1855 used attributively to denote a variety of ironstone. |
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