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	Gneiss - Wikipedia, the free encyclopedia
		Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from preexisting formations that were originally either igneous or sedimentary rocks.
		Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, etc. However, depending on their composition, they may also be called garnet gneiss, biotite gneiss, albite gneiss, etc. Orthogneiss designates a gneiss derived from an igneous rock, and paragneiss is one from a sedimentary rock.
		A coarse-grained gneiss, probably originated from metamorphism of igneous granite, whith characteristics elliptic or lenticular feldspaths, normally microcline, contrasting with the ribbon shape of the quartz, biotite and magnetite clusters.
	en.wikipedia.org /wiki/Gneiss (221 words)

	GNEISS - LoveToKnow Article on GNEISS (Site not responding. Last check: 2007-10-07)
		The gneisses all possess a more or less marked parallel structure or foliation, which is the main feature by which many of them are separated from the granites, a group of rocks having nearly the same mineralogical composition and closely allied to many gneisses.
		Many gneisses are undoubtedly sedimentary rocks that have been brought to their present state by such agents of metamorphism as heat, movement, crushing and recrystallization.
		Those gneisses in which the minerals have been crushed and broken by fluxion or injection movements have been called protoclastic, while those which have attained their gneissose state by crushing long after consolidation are distinguished as cataclastic.
	58.1911encyclopedia.org /G/GN/GNEISS.htm (1614 words)

	Gneiss - Search Results - MSN Encarta
		Gneiss, metamorphic rock in which the minerals have been segregated into parallel layers, creating a banded or laminated structure.
		Eddystone Rocks, group of gneiss, or granitelike rocks, in the English Channel, southwestern England, near the Plymouth breakwaters.
		alabaster, basalt, chalk, conglomerate, flint, gneiss, granite, hornblende, lava, limestone, malachite, marble, pumice, quartzite, sandstone, schist,...
	ca.encarta.msn.com /Gneiss.html (114 words)

	AllRefer.com - gneiss (Geology And Oceanography) - Encyclopedia (Site not responding. Last check: 2007-10-07)
		The light bands of gneiss are generally composed of quartz and feldspar.
		Gneisses result from the metamorphism of many igneous or sedimentary rocks, and are the most common types of rocks found in Precambrian regions.
		Gneiss is found in New England, the Piedmont, the Adirondacks, and the Rocky Mts.
	reference.allrefer.com /encyclopedia/G/gneiss.html (211 words)

	Gneiss Metamorphic Rocks (Site not responding. Last check: 2007-10-07)
		Gneiss is a metamorphic rock form characterized by banding caused by segregation of different types of rock, typically light and dark silicates.
		Gneiss often forms from the metamorphism of granite or diorite.
		This example of gneiss is from Warm Springs, Georgia where a stressed formation produces it along with quartzite and schist, two other metamorphic rocks.
	hyperphysics.phy-astr.gsu.edu /hbase/geophys/gneiss2.html (169 words)

	Gneiss (Site not responding. Last check: 2007-10-07)
		Gneiss has a distinct banding, which is apparent in hand specimen or on a microscopic scale.
		Gneiss usually is distinguished from schist by its foliation and schistosity; gneiss displays a well-developed foliation and a poorly developed schistosity and cleavage.
		The mineralogy of a particular gneiss is a result of the complex interaction of original rock composition, pressure and temperature of metamorphism, and the addition or loss of components.
	geology.csupomona.edu /alert/metamorphic/gneiss.htm (332 words)

	Gneiss (Site not responding. Last check: 2007-10-07)
		Gneiss is coarser than schist and has distinct banding.
		The minerals that compose gneiss are the same as granite.
		Gneiss can be formed from a sedimentary rock such as sandstone or shale, or it can be formed from the metamorphism of the igneouse rock grantite.
	www.d303.org /schools/WildR/rocks/gneiss.htm (169 words)

	Gneiss (Site not responding. Last check: 2007-10-07)
		Gneiss is a coarse to medium grained banded metamorphic rock formed from igneous or sedimentary rocks during regional metamorphism.
		In some gneisses thin bands of quartz feldspar minerals are separated by bands of micas; in others the mica is evenly distributed throughout.
		Common orthogneisses (gneisses formed from igneous rocks; those formed from sedimentary rocks are called paragneisses) are similar in composition to granite or granodiorite, and some may have originally been lava flows.
	ist-socrates.berkeley.edu /~eps2/wisc/gneiss.html (199 words)

	Black Canyon Of The Gunnison National Park - Gneiss (Site not responding. Last check: 2007-10-07)
		Gneiss (pronounced "nice') has bands, layers, or even lenses of blocky crystals such as feldspar, alternated with bands of a flat, plate-like mineral such as mica.
		Gneiss represents some of the most advanced stages of metamorphosis with some of the most intense temperatures and pressures.
		The gneiss has been so highly transformed, meaning that the temperatures and pressures were so extreme, that there is little evidence of what the original sedimentary layers of rock were.
	www.nps.gov /blca/webvc/gneiss.htm (419 words)

	Gneiss: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-07)
		Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite granite quick summary:
		Diorite is a grey to dark grey intermediate intrusive igneous rock composed principally of plagioclase feldspar (typically andesine), hornblende, and/or...
		The word "gneiss" is from an old Saxon[Follow this hyperlink for a summary of this subject] mining term that seems to have meant decayed, EHandler: no quick summary.
	www.absoluteastronomy.com /encyclopedia/g/gn/gneiss.htm (691 words)

	gneiss (Site not responding. Last check: 2007-10-07)
		GNEISS Gneiss is a high-grade metamorphic rock that can have many different parent rocks, with the most common being granite, diorite and schist.
		Diane with a sample of gneiss (and MandM's) in the San Gabriel Mountains of southern California.
		Gneiss polished smooth by a river in Colorado.
	seis.natsci.csulb.edu /bperry/metarock/GNEISS.htm (249 words)

	gneiss articles on Encyclopedia.com
		gneiss GNEISS [gneiss], coarse-grained, imperfectly foliated, or layered, metamorphic rock.
		Gneiss is characterized by alternating light and dark bands differing in mineral composition and having coarser grains than those of schist.
		Schists are distinguished from the other foliated rocks, slates and gneisses, by the size of their mineral crystals; these are larger
	www.encyclopedia.com /searchpool.asp?target=gneiss (457 words)

	Gneiss
		In gneisses the mafic minerals (biotite and amphibole) and light minerals (quartz and feldspar) have separated into separate bands.
		This specimen is not far removed from a schist seen closeup (for example), but the megascopic banding here puts it in the gneiss category.
		Gneisses are typically associated with major mountain building events when shales or clay rich sandstones (wackes), or felsic igneous rocks (e.g.
	csmres.jmu.edu /geollab/Fichter/MetaRx/Rocks/gneiss1.html (170 words)

	Gneiss
		Gneisses have minerals large enough to be identified with the naked eye that have been segregated into roughly parallel bands or layers.
		Many gneisses are made of the same minerals as coarse-grained intrusive rocks such as granite or diorite.
		This is known as an augen gneiss, after the large blobs of stretched feldspar crystals known as augen (German for 'eye').
	www.pitt.edu /~cejones/GeoImages/6MetamorphicRocks/Gneiss.html (265 words)

	Untitled Document (Site not responding. Last check: 2007-10-07)
		The Morton Gneiss, which is 3.6 billion years old, is a coarsely crystalline, foliated metamorphic rock.
		The fact that it is a crystalline rock with large visible grains indicates that it originated as a granitic igneous rock that cooled slowly beneath the Earth’s surface.
		Gneiss is quarried for use as building stone and monuments.
	www.geo.umn.edu /mgs/virt_egg/gneiss.htm (131 words)

	GemRocks: Gneiss
		Gneiss paperweight (width -10 cm) made of faulted gneiss, that consists of alternating fl amphibole-rich and white quartz-rich bands; piece is a sliced and polished cobble found in the drift in Isabella County, Michigan.
		Baltimore Gneiss of the Piedmont-Blue Ridge province of the mid-Atlantic United States is an example.
		It also is noteworthy, however, that in the laboratory and in the marketplace, the geographic locality of the bedrock occurrence of a given specimen of gneiss or of the gneiss used to fashion a given item may not be known.
	www.cst.cmich.edu /users/dietr1rv/gneiss.htm (562 words)

	Gneiss
		Gneiss is a rock formed during regional metamorphism.
		It is generally a coarse-grained granular textured rock which can develop from a wide variety of igneous and sedimentary material.
		Gneisses consist of alternating dark and light bands of minerals which can vary in thickness, from milimetres up to a metre and can be highly contorted.
	www.es.ucl.ac.uk /schools/Glossary/gneiss.htm (94 words)

	Harford County R&M - Gneiss (Site not responding. Last check: 2007-10-07)
		Gneiss is a metamorphic rock that is found in Maryland, chiefly in the Piedmont section.
		Gneiss is used as a building stone, but it has also been used in making paving blocks, curbing, and crushed for roads.
		Additionally, it is Harford County gneiss that was used to build the long jetties that we see in Ocean City and Assateague, Maryland.
	cte.jhu.edu /techacademy/fellows/brannon/webquest/gneiss.htm (199 words)

	GNEISS - Online Information article about GNEISS (Site not responding. Last check: 2007-10-07)
		The gneisses all possess a more or less marked parallel structure or foliation, which is the See also:
		oligoclase occurs also very frequently, especially in certain sedimentary gneisses, while more basic varieties of plagioclase are rare.
		history, to which most gneisses belong, and in the relatively deep parts of the earth's crust, where they usually occur, there has been most igneous injection and greatest frequency of earth movements, it is not difficult to understand the See also:
	encyclopedia.jrank.org /GEO_GNU/GNEISS.html (1085 words)

	Olympus Microscopy Resource Center: Polarized Light Microscopy Gallery - Diorite Gneiss
		A medium- to coarse-grained metamorphic rock, gneiss exhibits alternating light and dark bands, which is a characteristic usually caused by the separation of mafic and felsic minerals.
		However, despite their foliated appearance, gneiss does not exhibit the well-developed cleavage and schistosity that is found among schists.
		Variable in a number of other regards as well, gneisses are often classified based upon a number of attributes, including parent material, chemical composition, and probable formation process, resulting in descriptors such as diorite gneiss, diopside gneiss, and orthogneiss.
	www.olympusmicro.com /galleries/polarizedlight/pages/gneissdioritesmall.html (280 words)

	Summary of Citation
		No certain traces of clastic origin have ever been detected in Baltimore gneisses, although their sedimentary character may be inferred from their rapid alternations of beds of different composition, and from the nature of other rocks intercalated in them, like the marbles and quartz schists.
		Baltimore gneiss, on which the rocks of Glenarm series were deposited is now exposed only in southeastern MD and PA, as far as known.
		The Baltimore is intruded by the Slaughterhouse Gneiss (new) and the Gunpowder Gneiss.
	ngmdb.usgs.gov /Geolex/Refsmry/sumry_252.html (833 words)

	Gneiss, freestanding Sculpture by Elias Wakan
		This finely poised piece, whose densely formed base carefully counterweights its slanting top, suggests the banding of "gneiss" (pronounced "nice") - high-grade, folded and refolded metamorphic rock.
		Gneiss is used as a building stone and Gneiss presents a structured edifice - a piece of subtly balance tension.
		Constructed from over 500 identical pieces, the most dramatic visual aspects of this sculpture are probably the Moire patterns that come into view whenever the sculpture is between the viewer and a light source, whether reflected or direct.
	www.eliaswakan.com /gneiss.html (93 words)

	Gneiss
		The gneisses are common and widely distributed rocks which have been derived by metamorphic processes from preexisting formations that were originally either igneous or sedimentary rocks.
		The word "gneiss" is from an old Saxon mining term which seems to have meant decayed or rotten, or possibly worthless material.
		All right, I don't know but what it will be lost no time in telling his brothers.
	www.findword.org /gn/gneiss.html (446 words)

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