Like pumice

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.