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Longman Dictionary of Contemporary English
igneous
adjective
COLLOCATIONS FROM CORPUS
■ NOUN
intrusion
▪ The island was uplifted and igneous intrusions took place.
rock
▪ These formed hard igneous rocks which have resisted erosion.
▪ In the same way, the earmarks of igneous rocks are their mineralogy, textures, and structures.
▪ Which are these hills of igneous rocks?
▪ Though igneous rocks are not layered, as sediments are, they too have characteristics that place them in time.
▪ Extensive areas within continental platforms are formed of basement, a complex of metamorphic and igneous rocks of Palaeozic or Precambrian age.
▪ Many of these materials are what we would call igneous rocks if we were to find them on Earth.
▪ In describing the physical properties of igneous rocks and the minerals that compose them, their texture and acidity were mentioned.
▪ Figure 3-17 shows graphically the division of igneous rocks according to their mineral content and their grain size.
EXAMPLES FROM CORPUS
▪ At a later time, according to Hutton, subterranean heat may produce an intrusion of igneous rock.
▪ Auger spectroscopy of igneous and metamorphic rocks has shown fine films of carbon covering grain boundaries.
▪ Extensive areas within continental platforms are formed of basement, a complex of metamorphic and igneous rocks of Palaeozic or Precambrian age.
▪ Granulites are like their textural equivalents, granular igneous rocks, in being mosaics of interlocking crystals of roughly equal size.
▪ The same structural features, sometimes less easily recognized, are found in igneous and metamorphic rocks.
▪ Though igneous rocks are not layered, as sediments are, they too have characteristics that place them in time.
▪ Thus it is very well developed on fine-grained basic igneous and metamorphic rocks.
▪ Which are these hills of igneous rocks?
The Collaborative International Dictionary
Igneous

Igneous \Ig"ne*ous\, a. [L. igneus, fr. ignis fire; allied to Skr. agni, Lith. ugnis, OSlav. ogne.]

  1. Pertaining to, having the nature of, fire; containing fire; resembling fire; as, an igneous appearance.

  2. (Geol.) Resulting from, or produced by, the action of fire; as, lavas and basalt are igneous rocks.

Douglas Harper's Etymology Dictionary
igneous

1660s, from Latin igneus "of fire, fiery," from ignis "fire," from PIE *egni- "fire" (cognates: Sanskrit agnih "fire, sacrificial fire," Old Church Slavonic ogni, Lithuanian ugnis "fire").

Wiktionary
igneous

a. 1 Pertaining to, having the nature of fire; containing fire; resembling fire; as, an '''igneous''' appearance 2 (context geology English) Resulting from, or produced by, the action of great heat; with rocks, it could also mean formed from lava/magma; as, granite and basalt are '''igneous''' rocks

WordNet
igneous
  1. adj. produced under conditions involving intense heat; "igneous rock is rock formed by solidification from a molten state; especially from molten magma"; "igneous fusion is fusion by heat alone"; "pyrogenic strata" [syn: pyrogenic, pyrogenous]

  2. like or suggestive of fire; "the burning sand"; "a fiery desert wind"; "an igneous desert atmosphere" [syn: fiery]

Wikipedia

Usage examples of "igneous".

It is a common product of alteration in igneous rocks, and frequently occurs as well-developed crystals in association with zeolites lining the amygdaloidal cavities of basaltic and other rocks.

Medium grey andesite, an igneous volcanic rock, speckled with crystals of dark minerals, knobbed with hard protrusions.

Suhl, about forty miles to the east, to see igneous granites, rhyolites, and andesites, as well the copper mines of nearby Goldlauter.

Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt.

Like enstatite, bronzite is a constituent of many basic igneous rocks, such as norites, gabbros, and especially peridotites, and of the serpentines which have been derived from them.

Some of them had cracked over a platinoid-rich mafic igneous intrusion that the miners had named the Merensky Reeflets.

The anticline was nothing but the sill of igneous rock that my grandfather had struck in 1913.

A crescent bank of the mottled red igneous stone stood close by Bloodstone, raised somewhat, as an altar before an idol.

Bacmudsorak, swearing us all to secrecy, noted that early in its igneous development, it had harbored a millennia-long case of pyroclastic envy against a pit mine of collateral laminates.

Shadows cast by innumerable stone towers combed the dark blue water, all pointing in the same transitory direction, as if the stony pinnacles were gnomons to a half-thousand igneous sundials, tracking in unison the serene march of hours, of aeons.

Though the markings on the satellite photographs of the area showed only a dark pebbly texture, sheer outcroppings of gray igneous rock pushed up from the layered strata, blocking any straight path.

The walls were of dense igneous rock, not the limestone of surface outcrops in the grounds of the ruined palace.

I made it clear, therefore, both in the broadcast and in the article I wrote for the Calgary Tribune, that we were into the igneous country that had stopped Campbell Number One and that given a few more weeks we should undoubtedly bring in a well.

They were of the same coruscated igneous rock that had pushed up from the ocean's floor so many centuries ago: twisted and ridged forever by the cataclysm of its birth.

The hill contained a widely disseminated deposit of mineral in apparently evenly consistent presence throughout the rock, which was of igneous type and millions of years older than the sandstone and ragstone of the mountains that surrounded it.