siliceous
silicious

To strike out love from that siliceous nature a man of iron was needed.

The latter term should be restricted to siliceous minerals, however.

It is found in the crevices of fractured siliceous rock.

The name is also given to other friable siliceous stones applied to like uses.

A North American native, it generally grows on siliceous rocks.

It is frequently found also as siliceous internal moulds.

The soil is mainly siliceous earth, clay and sand.

These may be organic or siliceous and come in various shapes and sizes.

The substrate is the white siliceous sand that was once part of an ancient dune system.

It consists of a thin siliceous membrane covered with small pores.

It seems to prefer poorer soils, both siliceous and non-calcareous.

The cells have a conical base, and are covered with long siliceous spicules.

It consists of siliceous siltstones, formed in deep water.

It grows on sandy siliceous soils, often amongst tall scrub.

This genus is characterized by a high density of siliceous spicules.

The minerals are cemented by a non-carbonate matrix, probably siliceous.

Not an official gemstone, it is a siliceous chalcedony.

The most common siliceous rock is chert other types include diatomite.

The siliceous skeleton of the sponges is fragile, and these organisms are easily broken by physical impact.

This area has rocky soils of siliceous sand, vegetated by dense scrub.

It consists almost wholly of the siliceous shells of diatoms.

The redeposited cementing material is most commonly calcareous or siliceous.

Gold mineralization was discovered with pyrite in slightly siliceous tuff.

The main agents responsible for the deposition of siliceous sinter are algae and other vegetation in the water.

The rock is siliceous and hard.

Other dead vegetation, because of the highly silicious water, always gets petrified unless it is eaten first.

Worked tools were found made from abundant nodules of silicious, grey-yellow limestone.

Monocotyledons, including grasses and sedges, form tussocks of hard, often silicious leaves that protect the growing points within.

Above the formation is the Piyuancun formation consisting of silicious rock.

This alternates with silicious limestone.

The skeleton of sponges consists of microscopic calcareous or silicious spicules.

The source of dissolved silica in the porous media could arise from the spicules of silicious sponges.

The soil was light and friable, and below lay a bed of silicious tufa; therefore, even without tools, the aperture deepened quickly.

A slight mechanical change would produce a crater of eruption in these slopes, which consisted merely of whitish silicious tufa.

They chew them up, dehydrate them, and convert their silicious outer bark and carbonaceous interiors into silicones for themselves.

Large flakes, picks, large scrapers and choppers made on discoid cores were found, most frequently in chert-like flint or silicious grey limestone.

They are chiefly made up of perfect little calcareous shells (Foraminifera) and contain, also, a small number of silicious shells (Diatomaceae).

On the lower flank this side of the predominantly andesitic volcano, is Luzon's largest solfataras and hot springs, some of which deposit silicious sinter.

The tectonic activity of the Alps continues to bring the Fiz rock cliffs closer to the silicious rocks of the Pormenaz.

In the silicious matter which the water deposits is perhaps the bony system, and in the still finer soil and organic matter the fleshy fibre or cellular tissue.

Soon the nature of the soil changed; to the sandy plain succeeded an extent of slimy mud which the Americans call "ooze," composed of equal parts of silicious and calcareous shells.

What the exact system was, if there was any beyond placing them for a. long period of years under the drip, I never discovered, but there they sat iced over and preserved forever by the silicious fluid.

Downstream from Burgess Falls Dam, the river enters a gorge underlain by silicious Mississippian limestone that contains nodules of mineral quartz, making it resistant to erosion, allowing the development of the gorge's three waterfalls.

Portland Pozzolana cement Portland pozzolana cement is ordinary Portland cement blended with pozzolanic materials (power-station fly ash, burnt clays, ash from burnt plant material or silicious earths), either together or separately.

The name is said to have originated from the silicious limestone cliff, about 60 feet high, at Hill Farm, rising over a great bed of yellow mica which breaks the level at the shore and has a glittering appearance in sunshine, especially to ships passing in the Bristol Channel.

These creatures, to judge from the shrivelled remains that have fallen into human hands, were bipeds with flimsy, silicious skeletons (almost like those of the silicious sponges) and feeble musculature, standing about six feet high and having round, erect heads, and large eyes in flinty sockets.