| 单词 |
perthite |
| 释义 |
perthite Min.|ˈpɜːθaɪt|
[Named by T. Thomson (1832) after Perth, Ontario, where found: see -ite1.]
(See quot. 1868.)
1832C. U. Shepard Min. 1. 232 (Chester). 1868Dana Min. (ed. 5) 356 Perthite, a flesh-red aventurine feldspar, consisting of interlaminated albite and orthoclase.
Hence perˈthitic a., pertaining to, resembling, or containing perthite; perˈthitically adv., in the manner of perthite.
1905in N.E.D. 1906J. P. Iddings Rock Minerals ii. 236 Perthitic intergrowth. 1930Peach & Horne Geol. Scotl. 112 The alkali-felspar includes both orthoclase and albite, which may be present separately, perthitically intergrown. 1949Econ. Geol. XLIV. 174 In the diorite facies the microcline is generally only slightly perthitic..whereas in the syenitic rock it is ordinarily highly perthitic. Ibid. 179 The sodic solutions soaked into the microcline and replaced it perthitically by albite and then by grains along margins and fractures. 1965G. J. Williams Econ. Geol. N.Z. xiii. 208/2 A radioactive biotite-granite with quartz, perthitic orthoclase, microcline and 20 per cent of dark minerals was also found in the Big River area. |
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