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.[1] Pyroxenes (clinopyroxenes) are common accessory minerals. Quartz and olivine are absent. The absence of olivine distinguishes them from the otherwise similar basanite. Its parameters are defined in the QAPF diagram. Occurrences include leucite nepheline tephrite from Hamberg bei Neckarelz near Heidelberg, Germany,[2], leucite tephrite to phono-tephrite is common at Mount Vesuvius[3], phonolite-tephrite at Monte Vulture, Basilicata, Italy and basanite–tephrite intrusions in Namibia.
References
- ↑ "Geology Dictionary: Tephrite". Volcano Discovery. Retrieved 21 April 2026.
- ↑ Frenzel, Gerhard (1953). "Die Erzparagenese des Katzenbuckels im Odenwald". Contributions to Mineralogy and Petrology (in German). 3 (6): 409–444. doi:10.1007/BF01129196.. Retrieved 2012-04-11.
- ↑ Cigolini, Corrado (December 2007). "Petrography and thermobarometry of high-pressure ultramafic ejecta from Mount Vesuvius, Italy: inferences on the deep feeding system" (PDF). Periodico di Mineralogia (76.2-3): 5–24. doi:10.2451/2007PM0015.
