| 单词 | penetration twin |
| 释义 | > as lemmaspenetration twin penetration twin n. Crystallography a twin crystal that presents the appearance of two interpenetrating crystals. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystal types > [noun] > composite crystals > twin > types of penetration twin1868 juxtaposition twin1883 multiple twin1932 1868 J. D. Dana Syst. Mineral. (ed. 5) 191 Penetration-twins, the forms not corresponding to a regular revolution, but to an irregular interpenetration of unlike parts of the crystal. 1912 A. H. Phillips Mineralogy i. vii. 143 Penetration twins with the same axis as the twinning axis occur in galena and fluorite. 1990 C. Pellant Rocks, Minerals & Fossils 51/2 Many different types of twinning are recognized, including simple and polysynthetic, repeated, complex and penetration twins. < as lemmas |
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