igneous rock

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igneous rock

The term for a rock formed when molten rock cools and hardens. Extrusive, or volcanic, igneous rock cools on the surface as lava. Intrusive igneous rock forms when molten rock cools underground.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.igneous rock - rock formed by the solidification of molten magma
rock, stone - material consisting of the aggregate of minerals like those making up the Earth's crust; "that mountain is solid rock"; "stone is abundant in New England and there are many quarries"
andesite - a dark grey volcanic rock
aplite - light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars
groundmass - (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded
adesite - dark greyish extrusive rock
batholite, batholith, pluton, plutonic rock - large mass of intrusive igneous rock believed to have solidified deep within the earth
diorite - a granular crystalline intrusive rock
gabbro - one of a family of granular intrusive rocks
pegmatite - a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements
peridotite - a dark coarse-grained igneous rock consisting principally of olivine
rhyolite - very acid volcanic rock
volcanic rock - extrusive igneous rock solidified near or on the surface of the Earth
porphyritic rock, porphyry - any igneous rock with crystals embedded in a finer groundmass of minerals
sodalite - a vitreous mineral consisting of sodium aluminum silicate and sodium chloride in crystalline form; occurs in igneous rocks
References in periodicals archive ?
Waste at the site of the mine, including potentially reactive or acidic rock, would be covered under the state's Permit to Mine.
OET Patrick Jones has always had close artistic ties with his brother Nicky Wire, but this week the pair could find their albums sitting side by side in book shops and record stores Manic Street Preachers are garnering rave reviews for their latest work Journal For Plague Lovers, which combines their acidic rock with the poetic lyrics of Richey Edwards.
The paper broke and followed a story concerning the construction of Interstate 99, a project that caused public outcry when unearthed natural acidic rock was found to be polluting streams and wells.