| 单词 | bone coal |
| 释义 | > as lemmasbone coal bone coal n. coal containing slaty or shaly material; cf. sense 12.In quot. 1817 the name of a deposit of such coal. ΚΠ 1817 Lancaster Gaz. 18 Jan. 1/2 Five valuable mines of coal, called by the names of the Arley Mine (six feet thick)—The Five Feet Mine (five feet thick)—The Bone Coal (two feet six inches thick) [etc.]. 1844 Jrnl. Franklin Inst. Mar. 178 The calcareous earth must be removed before the boiling down, which requires either acids,..or bone coal, which is expensive. 1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) viii. 181 Other recognizable varieties of coal are the thin layers of mineral charcoal or mother-of-coal, looking like wood charcoal.., and bone-coal, the lean sandy or shaly partings in some coal beds, which contain too much ash to be good fuel. 1999 Palaios 14 434/1 (caption) The seam is comprised of a series of benches split by partings and bone coal that can be correlated between mines. < as lemmas |
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