| 单词 | hourglass structure |
| 释义 | > as lemmashourglass structure hourglass structure n. Geology a structure present in certain rocks in which the mineral crystals have the shape of an hourglass. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystal habit > [noun] > miscellaneous others shoot1670 stella1844 hourglass structure1888 spherulite1893 lath1916 1888 J. J. H. Teall Brit. Petrogr. vii. 159 The hour-glass structure already mentioned as occurring in the picrites is occasionally found in the normal plagioclaseaugite rocks. 1932 F. F. Grout Petrogr. & Petrol. 100 ‘Hourglass’ structure is occasionally noted in augite. 1959 W. W. Moorhouse Study of Rocks in Thin Section vi. 166 The larger grains and phenocrysts may be zoned, or they may show hourglass structure. < as lemmas |
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