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volcanic rock

   Also found in: Wikipedia, Hutchinson 0.20 sec.
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Noun1.volcanic rockvolcanic rock - extrusive igneous rock solidified near or on the surface of the Earth
agglomerate - volcanic rock consisting of large fragments fused together
amygdaloid - volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits
dacite - a grey volcanic rock containing plagioclase and quartz and other crystalline minerals
basalt - the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene
volcanic glass - a kind of natural glass produced when molten lava cools very rapidly
lava - rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface
tuff, tufa - hard volcanic rock composed of compacted volcanic ash
igneous rock - rock formed by the solidification of molten magma


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The surrounding shores were wild and broken, with overhanging cliffs and precipices of black volcanic rock.
Astoria or Anecdotes of an enterprise beyond the Rocky Mountains by Irving, Washington View in context
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