Geochemically, the pyroxene nephelinite is highly enriched in LILE compared with the first one. |
Rounded, yellow, weathered peridotite xenolith in a nephelinite lava flow at Kaiserstuhl, SW Germany. |
The composition studied has very low albite and is classified as transitional between olivine nephelinite and nepheline-rich basanite. |
Another New Zealand locality for this type of nephelinite is in the Auckland Domain. |
They are chiefly leucite and nepheline rocks, such as leucitite, leucitophyre and nephelinite, but basalt and trachyte also occur. |
The lava flows within the pyroclasts are composed of nephelinite and phonolite. |