Tephrite
Tephrite is an
igneous, volcanic (
extrusive)
rock, of felsic composition, with
aphanitic to
porphyritic texture. Mineral assembly is usually abundant feldspatoids and
plagioclase, and lesser alkali
feldspar. Pyroxenes (clinopyroxenes) are common accessory minerals.
Quartz and
olivine are absent.
See also: igneous rocks, list of rocks