noun[mass noun] Geology
A fine-grained basaltic rock containing nepheline in place of plagioclase feldspar.
- Geochemically, the pyroxene nephelinite is highly enriched in LILE compared with the first one.
- Another New Zealand locality for this type of nephelinite is in the Auckland Domain.
- The lava flows within the pyroclasts are composed of nephelinite and phonolite.
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