Volcanic neck

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Vol`can´ic neck

1.(Geol.) A column of igneous rock formed by congelation of lava in the conduit of a volcano and later exposed by the removal of surrounding rocks.
References in periodicals archive ?
The Guamal volcanic neck intrudes a stratigraphic sequence, completely different than that of the Cordillera.
Key words: volcanic neck, Lahar, Llanos Border, Eastern Cordillera.
Aside from Cargill's vast phosphate deposit near Kapuskasing (which is refined into fertilizer), Cosec knows of no other producers in the Sudbury basin for the simple reason these rocks are hard to find in volcanic necks, as are diamonds.