Appearance: Dark coloured, fine- or medium-grained alkali, Si-undersaturated intrusive igneous rocks. It contains approximately equal amount of clinopyroxene (Ti-rich agugite, aegirinaugite, aegirine) and nepheline. In addition, olivine, phlogopite and further feldpathoids could also occur. It can be found often accompanying with carbonatites mostly in continental rift zones and ocean islands. It is the intrusive equivalent of nephelinite at least based on chemical composition.
Essential minerals: clinopyroxene (Ti-augite, aegirinaugite, aegirine), nefeline
Accessory minerals: olivine, flogopite, leucite, zircon, apatite, magnetite and/or ilmenite, carbonate minerals, garnet (melanite)
Secondary minerals: sericite, epidote, chlorite
jacopirangite: pyroxene-rich variety of ijolite
Locations in the Carpathian-Pannonian region: not known
NEPHELINITE, LEUCITITE, MELILITITE
Appearance: Dark coloured, usually aphyric volcanic rock. It contains abundant feldspathoids (nephelinie or leucite), in addition to olivine, clinopyroxene and phlogopite phenocrysts. The feldspathoids could occur also as phenocrysts. Feldspars are lacking or are in minor amount. They are typical of continental rift zones and could occur also in oceanic islands.
Essential minerals: olivine, clinopyroxene, feldpathoids (nepheline, leucite, melilite)
Accessory minerals: zircon, apatite, magnetite and/or ilmenite, analcime, carbonate minerals, perovskite, sodalite
Secondary minerals: analcime, sericite, chlorite
Locations in the Carpathian-Pannonian region: Stradner Kogel (Stájer-medence; nephelinite); Bár (olivine-leucitite)