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Volcanic rock

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A generally finely crystalline and/or glassy igneous rock resulting from volcanic action at or near the Earth's surface, either ejected explosively or extruded as molten lava; e.g., basalt. The term includes near-surface intrusions that form a part of the volcanic structure. A general term to include the effusive rocks and some associated high-level intrusive rocks; they are dominantly basic.

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Klaus K.E. Neuendorf, James P. Mehl, Jr., and Julia A. Jackson (Editors), 2017. Glossary of Geology. Fifth REVISED edition. American Geological Institute (abbreviated as AGI).

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