These are principally schists, gneisses and quartzite.    From Wordnik.com.  [Dja Faunal Reserve, Cameroon] Reference

It was flowing over quartzite sand here and was clear as glass.    From Wordnik.com.  [Futures Imperfect]

They are derived from sandstone, quartzite, and shale substrata.    From Wordnik.com.  [Albany thickets] Reference

These are restricted to the poor, acidic quartzite-derived sands.    From Wordnik.com.  [Eastern Zimbabwe montane forest-grassland mosaic] Reference

Soils derived from quartzite are commonly stony and are often forested.    From Wordnik.com.  [Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)] Reference

A global review of solutional weathering forms on quartzite sandstones.    From Wordnik.com.  [Purnululu National Park, Australia] Reference

The United States has plentiful sand, quartzite, talc and mica resources.    From Wordnik.com.  [Silicon] Reference

It had been darkened, and one whole wall of the room was made of clear quartzite.    From Wordnik.com.  [The Colors of Space] Reference

Periodic outcrops of pink quartzite have influenced the topography of the region.    From Wordnik.com.  [Ecoregions of Wisconsin (EPA)] Reference

Its color is from white to pale red, and in many places it is an extremely hard quartzite.    From Wordnik.com.  [New York at the Louisiana Purchase Exposition, St. Louis 1904 Report of the New York State Commission] Reference

The metamorphic rock, quartzite, is another source (quartzite is metamorphosed sandstone).    From Wordnik.com.  [Silicon] Reference

Smaller amounts of marble, slate, sandstone, quartzite, and volcanic cinder are also used.    From Wordnik.com.  [Crushed stone] Reference

More than 100 endemic grassland species are found on the quartzite and dolomite rocks here.    From Wordnik.com.  [Drakensberg montane grasslands, woodlands and forests] Reference

•Cored by folded and faulted, interbedded Silurian sandstone, conglomerate, and quartzite.    From Wordnik.com.  [Ecoregions of New Jersey (EPA)] Reference

Linings can be made from granite, quartzite or similar hard rocks (not limestone or marble).    From Wordnik.com.  [8. Preparation of glazes] Reference

Between the quartzite layers are a number of layers of extremely thin mica-porphyrite or shale.    From Wordnik.com.  [Wulingyuan Scenic and Historic Interest Area, China] Reference

Layers in the quartzite lie at a fairly oblique angle of 5-8°, which provides vertical stability.    From Wordnik.com.  [Wulingyuan Scenic and Historic Interest Area, China] Reference

Sometimes they are very regularly laminated, or assume even the appearance of the hardest quartzite.    From Wordnik.com.  [The Atlantic Monthly, Volume 18, No. 105, July 1866] Reference

The compact quartzite of Sioux Falls, Dakota, is being quarried and polished for ornamental purposes.    From Wordnik.com.  [Scientific American Supplement, No. 598, June 18, 1887] Reference

Maximum elevation, about 1,400 feet (427 m), occurs on the Cambrian quartzite knobs of Wernersville Ridge.    From Wordnik.com.  [Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)] Reference

The largest intact areas of this habitat are found in the Isalo and Itremo massifs on sandstone and quartzite.    From Wordnik.com.  [Madagascar subhumid forests] Reference

The soils of this plateau are mostly coarse, sandy and shallow, overlying granite, quartzite, sandstone or shale.    From Wordnik.com.  [Southern Africa bushveld] Reference

Another object of quartzite was reported to have fallen, in the autumn of 1880, at Schroon Lake, N.Y. -- said in the.    From Wordnik.com.  [The Book of the Damned] Reference

And now, when I am on the subject, I may point out that this hard and compact quartzite pebble was also once loose sand.    From Wordnik.com.  [The American Architect and Building News, Vol. 27, Jan-Mar, 1890] Reference

Generally speaking, the ecoregion is composed of very old crystalline substrates (granite, schist, quartzite, and marble).    From Wordnik.com.  [Southwest Iberian Mediterranean sclerophyllous and mixed forests] Reference

Along the northern edge the Tibetan-Tethys is exposed, consisting of sandstones, micaceous quartzite, limestones and shales.    From Wordnik.com.  [Nanda Devi and Valley of Flowers National Park, India] Reference

The Central mountain ranges have a predominance of crystalline metamorphic substrates, mainly granite, quartzite, and schist.    From Wordnik.com.  [Iberian conifer forests] Reference

Precambrian units are widespread and consist of quartzite, schist, phyllite, conglomerate, dolomite, siltstone and sandstone.    From Wordnik.com.  [Tasmanian Wilderness, Australia] Reference

Streams draining the quartzite-dominated Uinta Mountains tend to be acidic, low in nutrients, and low in total dissolved solids.    From Wordnik.com.  [Ecoregions of Wyoming (EPA)] Reference

Cambrian sedimentary and metasedimentary rocks, including sandstone and quartzite of the Chilowee Group, underlie Ecoregion 66e.    From Wordnik.com.  [Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)] Reference

Siliceous stone is composed mainly of quartzlike particles, and includes materials like granite, slate, sandstone, and quartzite.    From Wordnik.com.  [Protect Your Investment: Stone Countertops] Reference

Soils are well drained silty loess over residuum, limestone, sandstone or shale, with soils over quartzite in the Baraboo Hills area.    From Wordnik.com.  [Ecoregions of Wisconsin (EPA)] Reference

Ecoregion 66c is underlain by Precambrian metamorphic rock, including quartzite, graywacke, and conglomerate of the Lynchburg Formation.    From Wordnik.com.  [Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)] Reference

The grey-eyed, black-haired young woman turned from the quartzite window through which she had been watching the gathering storm overhead.    From Wordnik.com.  [A World is Born] Reference

In many areas late Precambrian outcrops of granitic gneisses and quartzite project from the surface as inselbergs (locally called kopjes).    From Wordnik.com.  [Southern Acacia-Commiphora bushlands and thickets] Reference