Tephrite
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Tephrite is an igneous, volcanic rock, with aphanitic to porphyritic texture. Mineral content is usually abundant feldspathoids, plagioclase, and lesser alkali feldspar. Pyroxenes are common accessory
An example of Tephrite found on the crater of Mount Vesuvius
Leucite tephrite from Mayen, Eifel, Germany
Basanite
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Basanite is an igneous, volcanic rock with aphanitic to porphyritic texture. It is composed mostly of feldspathoids, pyroxenes, olivine, and calcic plagioclase and forms from magma low in silica and e
Tephrite
…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…
Volcanic bomb of black basanite enclosing a xenolith of green dunite from Réunion
QAPF diagram showing the basanite/tephrite field in yellow
Basanite sculpture of Livia Drusilla