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tephrite : ウィキペディア英語版
tephrite

Tephrite is an igneous, volcanic (extrusive) rock, with aphanitic to porphyritic texture. Mineral content is usually abundant feldspathoids (leucite or nepheline), plagioclase, and lesser alkali feldspar. Pyroxenes (clinopyroxenes) are common accessory minerals. Quartz and olivine are absent. Occurrences include leucite nepheline tephrite from Hamberg bei Neckarelz near Heidelberg, Germany,〔Frenzel, Gerhard (1953) ''Die Erzparagenese des Katzenbuckels im Odenwald'', Contributions to Mineralogy and Petrology, Volume 3, Number 6, pages 409-444, DOI: 10.1007/BF01129196 . Retrieved 2012-04-11.〕 phonolite-tephrite at Monte Vulture, Basilicata, Italy and basanite–tephrite intrusions in Namibia.
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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