in thickness, and contain pebbles of quartzite, jasper, sandstone, slate, &c. The mines fall into five groups situated on the eastern side of the Deccan plateau about the following places (beginning from the south), the first three being in Madras.
Sawatch quartzite 50 350 ft.
The islands are of ironstone formation overlying quartzite and crystalline schists.
Quartz being a mineral very resistant to weathering agencies, it forms the bulk of sands and sandstones; and when the sand grains are cemented together by a later deposit of secondary quartz a rock known as quartzite results.
- This region, nearly coincident with the mountainous upper portion of the island, is chiefly composed of the following crystalline rocks: gneiss, which is the most common of them all, quartzite and quartz-schist, with occasional beds of crystalline limestone and mica-schist, although this latter rock is very rare.
The Nieuwerust beds contain quartzite, arkose and shales.
The finest building stone is a beautiful green quartzite rock of dense, fine texture and lasting quality.
A layer of white quartzite pebbles covered some graves.
On the, other hand, there occur bands of conglomerate, pebbly grit, quartzite, graphitic shale and limestone in a certain ordered sequence and over a wide area.
The rock is a very compact and fine-grained mixture of felspar, quartz and mica, often graduating to mica schist, quartzite and gneiss.
Examined more closely these are found to be vast accumulations of blocks of quartzite, irregular in form, but having a tendency to a rude diamond shape, from 2 to 20 ft.
in length, and half as much in width, and of a thickness corresponding with that of the quartzite ridges on the hills above.
Another out of many theories 1 is that the hard beds of quartzite are denuded by the disintegration of the sof ter layers.
It is not volcanic, but consists of argillaceous schist and quartzite.
In the south-east of Bosnia the predominant formations are Triassic and Palaeozoic strata with red sandstone and quartzite.
(3) The " banket " formation, which characterizes the goldfields of South Africa, consists of a quartzite conglomerate throughout which gold is very finely disseminated.
There are several series of parallel beds, interstratified with quartzite and schist, the most important being the "main reef" series.
In Ankole and Koki rocks consisting of granular quartzite, schistose sandstone, red and brown sandstone, and shales with cleaved killas rest on the Archean platform and possibly represent the Lower Witwatersrand beds of the Transvaal.
In Murua (Woodlark I.) are quarries of the banded quartzite from which the best stone adzes found throughout south-east New Guinea are made.
The commoner sorts of rock in the several Huronian systems are quartzite and slate (ranging from shale to schist); bi~t limestone is not wanting, and igneous rocks, both intrusive and extrtisive, some metamorphic and some not, abound.
Tuscarora quartzite 30 300
Sioux quartzite (?)
Nephin Beg, Nephin and Croagh Patrick are typical quartzite summits, the last named belonging possibly to a Silurian horizon but rising from a metamorphosed area on the south side of Clew Bay.
The oldest rocks are gneiss, schist and quartzite, the schist often containing gold.
The mountains consist here of an ancient laminated micaceous quartzite, which is in parts a flexible sandstone known as itacolumite, and in parts a conglomerate; it is interbedded with clay-slate, mica-schist, hornblende-schist and haematite-schist, and intersected by veins of quartz.
This series is overlain unconformably by a younger quartzite of similar character, and itself rests upon the crystalline schists.
8 shows how the crater of " pipe " of blue ground has penetrated these rocks and also the underlying quartzite.
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.
The quartzite work from Jebel Ahmar near Cairo stands next, as often very fine design is found in this hard material.
24), but more usually grinders blocks of quartzite sandstone (26-34), and occasionally Df diorite (Q.
The Paps of Jura, for instance, rise out of a long belt of quartzite which stretches through the islands of Islay, Jura and Scarba.
Archean gneiss, Cambrian sandstone, Silurian quartzite, limestone and schist, Jurassic sandstone and limestone, Cretaceous sandstone, and Tertiary basalts, gabbros, and granitic rocks all enter into the composition of the islands.
In descending order they embrace the following subdivisions, whose thickness in the district of Durness is estimated at about 2000 ft.: (e) limestones, dolomites and cherts, with numerous organic remains; (d) grit and quartzite, with Saltarella and Olenellus (Serpulite Grit); (c) calcareous shales and dolomites, with many annelid casts and sometimes Olenellus (Fucoid Beds); (b) Upper Quartzite, often crowded with annelid pipes (Pipe Rock Quartzite); (a) Lower Quartzite - their original upper limit can nowhere be seen, for they have been overridden by the Eastern Schists in those gigantic underground disturbances already referred to, by which these rocks, the Archean gneiss and Torridonian sandstone, were crumpled, inverted, dislocated and thrust over each other.
The Cambrian system - including the Upper (Durness-Eriboll Limestone) and the Lower (Serpulite grit, Fucoid Beds, Quartzite) - forms a narrow band which can be traced for too m.
The mining product next in value to coal in 1908 was copper, taken chiefly in Carbon county in a zone of brecciated quartzite underlying schist, the original ore being chalcopyrite, with possibly some pyrite, a secondary enrichment, which has produced important bodies of chalcocite in the upper workings, but these are replaced by chalcopyrite at greater depth.
In the lower series are, in descending order, the "Serpulite grits" or "Salterclla beds," the "Fucoid beds" and the "Eriboll quartzite," which is divided into an upper "Pipe rock" and lower "Basal quartzite."
The Cambrian rocks of Ireland, a great series of purple and green shales, slates and grits with beds of quartzite, have not yet yielded sufficient fossil evidence to permit of a correlation with the Welsh rocks, and possibly some parts of the series may be transferred in the future to the overlying Ordovician.
In the Marquette district of Michigan (Lake Superior) schistose specular ore occurs in important deposits, associated with a jasper rock, in which the ore alternates with bands of red quartzite.
The geological core of the system consists of primitive argillaceous schists, capped by quartzite and broken through in places by basalt.
It is estimated that less than 5% of the wells drilled into quartzite have encountered fracture porosity.
In past geological eras, various rocks including quartzite, grits and the Durness limestones were laid over much of the area.
At 023 049, a large fault is observed, trending approximately N-S, which juxtaposes shattered quartzite against shattered quartzite.
The oil was produced from fractured Precambrian quartzite on the summits of the buried hills.
A possible basal unconformity has been observed with a fine grained conglomerate lying on the hard Devonian quartzite.
Relatively undeformed quartzite far from the main fault with a single through-going microcrack.
quartzite pebbles covered some graves.
quartzite blocks lies hundreds of meters ahead of the hillside too.
quartzite scree spills down into Coire Dubh.
quartzite sandstone as the chamber.
quartzite boulder beaches lie stranded up to 50M above the current sea level.
In the north-western Highlands masses of white quartzite, resting unconformably in Torridonian sandstone, run from Loch Eriboll to Skye, forming in places great conical hills and some L J Recent & Pleistocene F l Cretaceous Jurassic Trias Granite & Acid Intrusive Rocks' Permian Coal Measures, Carboniferous Millstone Grit Series Lower Carboniferous Old Red Sandstone & Devonian Silurian Ordovician Cambrian Scale, z:4,600.000 English Miles o xxxx xzxx xxxx Metamorphic Group Volcanic Rocks ® Basic Intrusive Rocks 'I +++ +++ ob.o times capping isolated mountains of red Torridon sandstone.
obsidian, chert, chalcedony, agate and quartzite, but to prehistoric man (see FLINT IMPLEMENTS below) flint must have been of great value and served many of the uses to which steel is put at the present day.
high, and the prevailing rocks are granite, mica schist, diorite, porphyry and quartzite, the last, where it crops out on the surface, gleaming in the distance like snow.
The oil was produced from fractured PreCambrian quartzite on the summits of the buried hills.
The snowy white scree is made from quartzite rock.
But a line of quartzite blocks lies hundreds of meters ahead of the hillside too.
Beinn Eighe 57 1152 x 864 379K Beinn Eighe 's white quartzite scree spills down into Coire Dubh.
It and all the other articles in this chamber are of the same quartzite sandstone as the chamber.
Large quartzite boulder beaches lie stranded up to 50M above the current sea level.
Keep to tightly grained granites, rather than variegated designs, and consider soapstone, slate and quartzite as well.
Select a natural stone floor in slate, quartzite or travertine, or a porcelain or ceramic floor that mimics natural stone for easier maintenance.
Line the other walls with a Falling Water Pattern in slate or quartzite to coordinate.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.