The quartzite of the Hills is well crystallized and heavy.
I have one beautiful specimen of the dark Indian red variety through which passes a narrow line of pale blue, and the yellow quartzite or jasper sometimes shows dendrite markings.
This final finish was achieved by the Quartzite Hammers (Class IV.
Great, bare, rounded masses of hard quartziteprotruded through the scanty soil, and in the river were enormous boulders of granite-like gneiss.
No long Sacramento Valley, stretching away to the south and west of the quartzite upheavals, has here retained and preserved the spoils of those long ages of attrition and denudation.
Some of the quartzitehoes or spades measure sixteen inches in length, with a breadth of from six to seven inches, and evince remarkable dexterity and skill in their manufacture.
In regions where flint or hornstone is not available, the quartzite appears to have been most commonly resorted to.
The quartzite occurs in so many localities that it is difficult to trace its special source.
But the labours of the native miners were inadequate to provide supplies that could in any degree suffice to displace the flint or quartzite of the implement-maker.
There are several series of parallel beds, interstratified with quartzite and schist, the most important being the "main reef" series.
The "banket" formation, which characterizes the goldfields of South Africa, consists of a quartzite conglomerate throughout which gold is very finely disseminated.
Very minute traces of gold are found in the river-sands and gravels, and also some well-developed brown garnet crystals and quartzite and phyllite pebbles.
Unlike the quartzite mountains, which are usually conical or dome-shaped, Mweelrea is of a totally different structure.
The Reek,' has a northern face of precipitous declivities where the quartzite formation (as on Nephin) gives place to schists and shales.
They occur on Loch Maree near the top of the east side of Glen Fasagh, imbedded in the Quartzite, and run through the Quartzite to Glen Cruaidh Choillie.
It is pretty well exhibited in Glen Cruaidh Choillie, where it has been worked at various places, and where its superposed junction with the Quartzite can be seen.
To the right the magnificent mountain Beinn Eighe, with its quartzite peaks, rises very grandly; and in front are fine views of the Coulin hills.
These along with the Limestone he classes as Silurian, placing the underlying Quartzite with the Cambrian.
Of its position above the Quartzite there is no doubt.
It has thrown down the rocks on the eastern half of the ridge some distance, and affects both the Quartzite and the Torridon Red below.
A mile further on the road crosses a burn, whose bed is composed of fragments of white quartzite washed down from the rocky heights of Beinn Eighe.
A vertical fault exists in the middle of this Quartzite ridge, situated halfway between the two glens, and is easily distinguished by the eye from the other side of Loch Maree.
The Quartzite is interesting as exhibiting the earliest indications of organic life yet discovered in Scotland:-- 1.
The quartzite work from Jebel Ahmar near Cairo stands next, as often very fine design is found in this hard material.
A hard and fine-grained quartzite sandstone was quarried at Jebel Ahmar behind Heliopolis, and basalt was found thence along the eastern edge of the Delta to near the Wadi Tumilat.
It was the same broad stratum of quartzite which, on coming to the creek, had dipped down into Bunker's claim; and now Denver knew that others beside himself thought well of that mineral-bearing vein.
He was down on his knees, a single-jack in his right hand a pile of quartzite at his left, and as she came to the forks he went on cracking rocks without so much as a stare.
The Quartzite itself, which forms the chief road metal of the neighbourhood, is laid bare in a long series of quarries between Nuneaton and Hartshill.
It may be seen resting unconformably upon the Cambrian quartzite in the village of Rubery, and at Leach Heath.
In the Wrekin area the great volcanic series of the hills is immediately overlain by a quartzite similar to that of the Hartshill and the Lickey, the basement bed similarly containing fragments of the underlying volcanic rocks.
At the village of Rubery, in an exposure on the roadside, it is seen to be unconformably overlain by fossiliferous Llandovery sandstone, the basement beds of which contain fragments of the underlying quartzite in abundance.
The core of the Lower Lickey Hills between Barnt Green and Rubery, about eight miles south of Birmingham, is formed of a mass of quartzite identical in all its main features with that of Hartshill, near Nuneaton.
The lowest zone of the overlying Cambrian Hartshill quartzite is in part composed of their fragments.
The quartzite is succeeded by the Hollybush sandstone, with its characteristic fossil, Kutorgina cingulata.
The basement beds of the Hartshill Quartzite are locally composed of fragments of the underlying volcanic rocks (Caldecote Beds).
There are places where boulders of quartzite or other enduring rock still retain the smooth, glistening surfaces which the waves scoured upon them by clashing against them the sands of the beach.
At that horrid noise, the two boys stood frozen a moment, then with one accord raced to the control room, where they peered out of the quartzite ports.
He picked up the quartzite "fishbowl" and slipped it over Jon's head.
For them flint and quartzitetook the place of bronze, iron, or steel.
Only a few miles northward along the railway from Devils Lake is Ableman, where, exposed in a high cliff, the hard purplequartzite with beautiful ripple marks to reveal its plane of sedimentation (pl.
Whereas a sandstone fractures about its constituent grains, a break in quartzite is continued through the grains and the cement alike.
Both are elongated, tapering sections of rose quartzite on which the margins have been retouched and the tip of each is notably abraded.
Four of quartzite and 1 of felsite porphyry are single-edged, the remainder are basalt.
All artifacts were basalt with the exception of 2 quartzite planes.
Basalt still appears to predominate as a source material, but quartzite appears to have been of more common usage, especially in the making of certain scraper types.
Quartz schist is produced fromquartzite by the development of fine folia of mica along planes of shear.
All gradations may be found between it and unfoliated quartzite on the one hand and mica schist on the other.
Cliffs of such slow-decaying rocks as quartzite and granite when closely jointed accumulate talus in large amounts.
As in fossiliferous formations strata of pure siliceous sand alternate with micaceous sand and with layers of clay, so in the crystalline or metamorphic rocks we have beds of pure quartzite alternating with mica-schist and clay-slate.
MacCulloch, found near a mass of trap, among the coal strata of Fife, was in all probability a stratum of ordinary sandstone, having been subsequently indurated and turned into quartzite by the action of heat.
Dirk, followed by Steinholt, hurried across the terrace and, leaving the shelter of its quartzite plates, sought the landing stage.
It landed, among many other planes, on the transparent, quartzite roof of a vast building and, looking down into the interior, they could see several rows of great dynamos.
Some of thequartzite specimens are very loose in texture.
Greenstone” may be diorite or diabase, or it may be a very compact dark sandstone or quartzite so weathered that its nature can not be determined from superficial observation.
There is considerable variety of material, quartzite largely predominating.
Nearly all are of quartzite or coarse flint, roughly worked, the one illustrated (figure 203) being above the average, and are mostly from western North Carolina and the adjacent portions of South Carolina and Tennessee.
Represented by two specimens ofquartzite from southeastern Tennessee.
One well finished specimen of this class is shown in figure 89; it is of quartzite from 4 feet beneath the surface in Crittenden county, Arkansas.
Implements used for the former purpose are made of any siliceous stone of convenient size and suitable texture, from a coarse quartzite to a very fine close-grained sandstone, according to the class of work to be done.
There are many small valleys in the sides of the quartzite ranges (especially the South range) which do not extend back to their crests, and therefore do not occasion passes across them.
This narrows also differs from the Lower in that the quartzite on one side is covered with Potsdam conglomerate, which overlies the truncated edges of the vertical layers of quartzite with unconformable contact.
There are many hillocks of a general kame-like habit associated with the terminal moraine south of the main quartzite range, and north of the Wisconsin river.
Besides the schistose belts, a wide zone of quartzite exposed in the bluffs at this locality has been crushed into angular fragments, and afterwards re-cemented by white quartz deposited from solution by percolating waters (Plate X).
Along this zone the quartzite has been broken into angular fragments, and at places the crushing of the fragments has produced a "friction clay.
As at the Upper narrows, the beds of quartzite here are essentially vertical.
These zones of schistose rock a few inches in thickness were developed from the quartzite by the slipping of the rock on either side.
There are also horizontal and oblique planes of cleavage dividing the columns, so that the great quartzite pile may be said to be made up of a series of blocks, which are generally in contact with one another.
The history of the little lake on the East quartzite bluff as already pointed out, came to an end while the ice was still present.
Nowhere in southern Wisconsin, or indeed in a large area adjacent to it, are there elevations which so nearly approach mountains as the ranges of quartzite in the vicinity of Baraboo and Devil's lake.
This sequence of events means that between the deposition of the quartzite and the sandstone, the older formation was disturbed and eroded.
In geological formation they are all much alike, a quartzite or quartz porphyry being the prevailing form of rock.
The shore on which we landed was covered with large blocks of quartzite stained with oxide of iron, and disseminated among them were many large irregularly-shaped masses of haematite.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "quartzite" in a variety of sentences. We hope that you will now be able to make sentences using this word.
