volcanic pipe

American  

[vahl-kan-ik pahyp] / vɑlˈkæn ɪk ˈpaɪp /

noun

1. Geology. a cylindrical or carrot-shaped conduit formed vertically beneath a volcano by magma emerging through the earth's crust up to the surface, eventually becoming filled with solidified magma and older rock fragments and noted for being the source of more commercial diamonds than any other geologic feature on earth.

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volcanic pipe Scientific  

1. A vertical conduit below a volcano through which magma has passed and that has become filled with solidified magma, volcanic breccia, and fragments of older rock.

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Example Sentences

A diamond, the locksmith reminds himself, is only a piece of carbon compressed in the bowels of the earth for eons and driven to the surface in a volcanic pipe.

From Literature

At Ruby Hill near Bingara they were found in a breccia filling a volcanic pipe.

From Project Gutenberg

But if Connel found the yellow ground while setting the charge, and took time to dig a little and be sure there was blue ground under it, he would certainly have known that he was standing on top of a volcanic pipe.

From Project Gutenberg

Montoya at once steered for the trail to the volcanic pipe.

From Project Gutenberg

A shelter had been erected on one side of the volcanic pipe.

From Project Gutenberg