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Tephrite is an igneous, volcanic (extrusive) rock, of felsic composition, with aphanitic to porphyritic texture. Mineral assembly 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 phonolite-tephrite Mt. Vulture, Basilicata, Italy, basanite–tephrite intrusions in Namibia, and leucite nepheline tephrite from Hamburg, Germany.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Tephrite". A list of authors is available in Wikipedia.|