a kind of rock which contains substantial amounts of alum, esp. in the form of the mineral alunite; alum stone.
| 单词 | θ5532 |
| 释义 | the world > the earth > structure of the earth > constituent materials > rock > mineral or chemical composition > [noun] > rock containing specific mineral (10) alum rockc1637 a kind of rock which contains substantial amounts of alum, esp. in the form of the mineral alunite; alum stone. silver-spat1668 a silver-bearing rock. salt-rock1670 †(a) rock-salt; (b) rock impregnated with salt. tin-spar1681 (see quot. 1796). garnet-rock1794 a rock consisting mainly of garnet. mimophyre1824 A type of uncrystallized rock with coarse grains of feldspar, resembling a porphyry. crystalline1856 Geology. A crystalline rock or rock formation. Cf. sense A. 3b. haüynophyr1865 A name for various rocks having haüyne disseminated through them. minette1866 Geology. A dark-coloured lamprophyre consisting chiefly of biotite and alkaline feldspars. phosphate rock1869 rock containing a substantial amount of calcium phosphate (usually in the form of apatite). |
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