Geol. An igneous rock, usually trappean, containing almond-shaped nodules or geodes of some mineral, as agate, chalcedony, or calc spar.
| 单词 | θ5753 |
| 释义 | the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > trap > amygdaloid (3) amygdaloid1791 Geol. An igneous rock, usually trappean, containing almond-shaped nodules or geodes of some mineral, as agate, chalcedony, or calc spar. mandelstein1799 = amygdaloid, n. spilite1834 An altered basalt, commonly amygdaloidal in structure, which is characterized by the albitization of its constituent feldspars and the presence… |
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