volcanic rock

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Noun1.volcanic rock - extrusive igneous rock solidified near or on the surface of the Earthvolcanic 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