| 单词 | pleochroic halo |
| 释义 | > as lemmaspleochroic halo pleochroic halo n. a spherical shell of colour surrounding and produced by a radioactive inclusion in certain minerals, manifesting in section as a ring or halo; usually in plural. ΘΚΠ the world > the earth > minerals > mineral structure or appearance > [noun] > pleochroic halo pleochroic halo1894 radiohalo1920 the world > matter > chemistry > crystallography (general) > crystal (general) > crystal inclusions > [noun] > radioactive inclusion pleochroic halo1894 radiohalo1920 1894 Naturalist 68 Pleochroic haloes, surrounding minute zircon crystals, are seen in both micas. 1972 M. H. Battey Mineral. for Students iii. 93/2 Small crystals of zircon, containing thorium, embedded in biotite, may by their α-radiation produce an intensely pleochroic halo. 1999 Belfast News Let. (Nexis) 19 Oct. (Features section) 17 We could consider the Earth's magnetic field.., pleochroic halos..star clusters, fossil graveyards... They all testify against evolution. < as lemmas |
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