A kind of rock, allied in composition to pozzolana, consisting largely of comminuted pumice or other volcanic substance; it is found along the…
| 单词 | θ5747 |
| 释义 | the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > other volcanics (6) tarras1612 A kind of rock, allied in composition to pozzolana, consisting largely of comminuted pumice or other volcanic substance; it is found along the… greystone1781 (a) A building stone of a grey colour. (b) Geology. A grey volcanic rock composed of feldspar (sometimes replaced by leucite or melilite) and… trass1794 = tarras, n. rhyolite1861 Originally: a variety of trachyte, containing quartz. In later use: a typically pale, fine-grained extrusive volcanic rock of granitic… nephelinite1863 A fine-grained basaltic volcanic rock containing significant amounts of nepheline and very little alkali feldspar. metavolcanic1942 A volcanic rock that has been subjected to metamorphism. Frequently in plural. |
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