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Topic: Hornblende schist

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tremolite schist

argillaceous schist

diorite schist

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hornblende schist

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	HighBeam Encyclopedia - schist (Site not responding. Last check: 2007-09-22)
		SCHIST [schist], metamorphic rock having a foliated, or plated, structure called schistosity in which the component flaky minerals are visible to the naked eye.
		Schists are distinguished from the other foliated rocks, slates and gneisses, by the size of their mineral crystals; these are larger than those of slates, being visible to the naked eye, but smaller than those of gneisses, which are coarsely foliated rocks as opposed to finely foliated, or schistose, rocks.
		As contrasted with the folia of slates, the folia of schists are rough-surfaced and irregular.
	www.encyclopedia.com /html/s1/schist.asp (281 words)

	Hornblende - Wikipedia, the free encyclopedia
		Hornblende is not a recognized mineral, but is used as a general or field term to refer to a dark amphibole.
		Hornblende is a common constituent of many igneous and metamorphic rocks such as granite, syenite, diorite, gabbro basalt, andesite, gneiss and schist.
		Very dark brown to fl hornblendes that contain titanium ordinarily are called basaltic hornblende from the fact that they are usually a constituent of basalt and related rocks.
	en.wikipedia.org /wiki/Hornblende (303 words)

	Schist - Wikipedia, the free encyclopedia
		Most schists have in all probability been derived from clays and muds which have passed through a series of metamorphic processes involving the production of shales, slates and phyllites as intermediate steps.
		Schists are named for their prominent or perhaps unusual mineral constituents, such as garnet schist, tourmaline schist, glaucophane schist, etc.
		The word schist is derived from the Greek meaning "to split", which is in reference to the ease with which schists can be split along the plane in which the platy minerals lie.
	en.wikipedia.org /wiki/Schist (298 words)

	Amphibolite - LoveToKnow 1911
		The hornblende is usually dark green (actinolite) but may be nearly fl in the hand specimen; in the microscopic slide it is commonly green of various shades, but may be brown, blue or nearly colourless.
		Epidote also, in yellow grains, is common (epidote-amphibolites), and in these rocks the hornblende may be of the blue and richly pleochroic variety known as glaucophane (glaucophane-epidote-schists).
		The amphibolites are typical rocks of the metamorphic group and as such attain a large development in all regions of crystalline schists and gneisses such as the Alps, Ardennes, Harz, Scottish Highlands, and the Lakes district of North America.
	www.1911encyclopedia.org /Amphibolite (936 words)

	Schist (Site not responding. Last check: 2007-09-22)
		Schist is a type of metamorphic rock in which lamellar minerals, such as muscovite, biotite, and chlorite, or prismatic minerals, such as hornblende and tremolite, are oriented parallel to a secondary platy or laminated structure termed the schistosity.
		Schists are commonly rich in quartz and contain some feldspars and carbonates.
		The specific mineral composition of a schist is indicated by placing the name or names of significant subordinate minerals in front of the word schist; commonly occurring types include biotite schist, muscovite-chlorite schist, garnet-mica schist, staurolite kyanite schist, and hornblende schist.
	socrates.berkeley.edu /~eps2/wisc/schist.html (203 words)

	Pegmatites of the Bridger Moountains, Wyoming
		The schists of the Bridger Range contain elongate grains of zircon, have a narrow range of plagioclase feldspars, and are almost devoid of quartz.
		Hornblende and plagioclase, and the accessory minerals magnetite and zircon are present.
		Because the schist is replaced for a great distance in a direction parallel to the strike of the schist and for only a very short distance normal to the schist's foliation, it is apparent that these joints were developed after the replacement of the schist.
	www.minsocam.org /msa/collectors_corner/arc/wybridgermts.htm (7195 words)

	Bedrock Geology Metadata
		Local layers are dark-gray to silvery schist or phyllite Cm Manhattan Schist (including Waramaug Formation and Canaan Mountain Schist) (Cambrian?) Dark-gray to silvery, rusty-weathering, generally coarse grained, foliated but poorly layered to massive gneiss or schistose gneiss, composed of quartz, oligoclase, microcline, biotite, and muscovite, and generally sillimanite and garnet.
		Ordovician) Gray to silver, medium- to fine-grained, well-layered to laminated schist and granofels, composed of quartz, oligoclase or albite, muscovite or sericite, biotite or chlorite, and in western belt local garnet, staurolite, and kyanite.
		and Middle Ordovician) Gray, rusty-weathering, medium- to coarse-grained, interlayered schist and gneiss, composed of oligoclase, quartz, K-feldspar, and biotite, and commonly garnet, sillimanite, graphite, and pyrrhotite.
	dep.state.ct.us /gis/dataguides/dep/layers/metadata/bedrock.htm (5946 words)

	hornblende.htm
		Hornblende is common as small grains in amphibolites and cross-cutting diorite dikes in outcrops along the Chippewa River at Holcombe Dam (SW Sec.
		FLORENCE COUNTY: Hornblende is a major constituent of amphibolite and hornblende schist in the Quinnesec Formation throughout the county.
		IRON COUNTY: Hornblende is abundant in gneissic and schistose rocks along the west branch of the Montreal River (Van Hise and Irving, 1892).
	www.uwrf.edu /~wc01/hornblende.htm (902 words)

	[No title]
		Hornblende schist, amphibolite, biotite schist, and granofels-North of Harding Mountain, hornfels with relict structures and textures indicating that the protolith was a mixture of mafic volcanic breccia, volcanic conglomerate, argillaceous sediment, chert, pillow basalt, and gabbro cut by dacitic dikes.
		Heterogeneous schist-Mostly quartzitic schist, micaceous quartzite, fine-grained schistose amphibolite, amphibolite, hornblende-biotite schist, biotite schist, calc-silicate schist, marble, and rare biotite porphyroblastic gneiss, augen gneiss, and pyroxene-biotite gneiss.
		Common in swarm are dikes of hornblende diorite and of aphyric to slightly plagioclase porphyritic brown-colored andesite(?).
	pubs.usgs.gov /ds/2006/184/chelmetadata.txt (7413 words)

	Metamorphic (Site not responding. Last check: 2007-09-22)
		SCHIST and GNEISS are similar, but schist has more flaky or flat minerals like mica and less blockly minerals like quartz.
		There are an infinite number of types of schist, just as there are an infinite number of types of cookies, for example, peanut butter cookies or oatmeal-cocanut cookies.
		In Connecticut, common minerals in schist are muscovite (light colored mica), biotite (fl mica), hornblende (fl crystals), quartz (usually gray), feldspar, and garnet.
	borntoexplore.org /ryan/metamorphic.htm (300 words)

	1914 report on Soapstone in Georgia
		The latter are commonly derived from the hornblende gneisses and schists.
		In brief, it may be stated that the peridotites and pyroxenites, the aluminum-poor rocks, alter to talc, while the gabbros, diorite and hornblende schists and gneisses, rocks richer in aluminum, alter dominantly to chlorite.
		It is associated with mica-cyanite schist and hornblende gneiss.
	www.darkfiber.com /tomb/1914_GA_soapstone_report.html (2650 words)

	Minerals
		The Mica schist is interbeeded with a bands of hornblende schist, talc schist,granulite and gnesis, Micaceous quartzite, several granitic bodies intrude all these rocks.
		The lineation due to elongation of minerals is commonly found in the granite gnesiss and mica schist, with a dip varies from 30 to 40 towards ENE.
		The granites schist and gneiss are invaded by swarms of pegmatite dikes and veins which are generally related with synkinematically emplace intrusive granite.
	koderma.nic.in /koderma/minerals.jsp (1032 words)

	[No title]
		Troxel and Gunderson (1970) noted the presence of Pelona Schist clasts in alluvial sediments south of El Mirage Lake and stated in their map descrip-tion that the sediments were deposited by debris flows deriving from the San Gabriel Mountains, some 33 km distant near the vicinity of Wrightwood.
		Hornblende that was analyzed by Miller and Morton (1980) from the Nash Hill phase at Gray Mountain appears to conflict with the prevalence of biotite as its mafic phase, but the rock contains as much as 2% hornblende in places.
		Schist is composed of biotite, quartz, and feldspar and is interlayered with minor quartzite and calcsil-icate rock.
	geopubs.wr.usgs.gov /open-file/of00-222/of00-222_2a.txt (7855 words)

	Geology of North Cascades National Park
		In the Chelan Mountains terrane, rocks born of a volcanic arc are mostly metamorphosed sandstone and conglomerate.
		The metamorphosed arc rocks also include hornblende schist and amphibolites from basaltic volcanic rocks, along with white mica schists derived from explosively erupted volcanic ash.
		Especially impressive in the Chelan Mountains terrane are remnants of the plutonic root of the old volcanic arc, known to geologists as the Marblemount pluton or plutons, which form high ridges in a long southeast-trending belt (see "MM" and "MD" on geologic map).
	wrgis.wr.usgs.gov /docs/parks/noca/t5chelanmtn.html (442 words)

	Volume 9 No. 1
		These rocks consist of granite gneiss, mica schist, and hornblende schist folded into large plunging antiforms and synforms, a domal granite gneiss complex, and a syenite intrusion.
		This gravity model suggests the hornblende schist unit of the George Creek synform thins with depth, and the Slate Creek synform is approximately 0.6 km deep.
		The hornblende schist west of the Squaw Peak granite gneiss complex has an anomaly of +2 mgal and a calculated thickness of 0.4 km.
	pubs.gg.uwyo.edu /CTGs/CTG_9-1.htm (1036 words)

	Schist: Metamorphic rock
		Schists are curious metamorphic rock in that they are not necessarily defined by mineral composition but by the well-developed parallel orientation of more than 50% of the minerals present.
		Typically hornblende and mica are particularly prone to reorientation.
		It is these mica-like minerals which give the rock a glistening appearance and are refrequently reflected in the naming of the rock e.g.
	freespace.virgin.net /craven.pendle/rocks/metamorphic/schist.htm (61 words)

	Summary of Citation (Site not responding. Last check: 2007-09-22)
		Is described as grayish muscovite schist containing irregular bands of white quartzose material and locally some thin layers of blue and white crystalline limestone.
		Geologic mapping in Weaverville quadrangle indicates that (1) structure of metamorphic rocks in that quadrangle is synclinoral and Abrams mica schist overlies Salmon hornblende schist, (2) Abrams is probably younger, rather than older, than Salmon, and (3) marble lenses are of stratigraphic significance in that they are chiefly in lower part of Abrams.
		Age of Abrams Mica and Salmon Hornblende Schists revised from Devonian or older Paleozoic to: Devonian.
	ngmdb.usgs.gov /Geolex/Refsmry/sumry_4500.html (1227 words)

	Merrick History of Wilbraham, Massachusetts - 1963
		Another schist formation, the Irving hornblende schist, occurs near the base of the Wilbraham Mountains on the east side.
		The hornblende and actinolite needles lie in the foliation plane of the schist with random orientations.
		The older hornblende schist appears to have been a limy sandstone, while the younger Amherst schist seems to have been a shale with occasional beds of limestone.
	www.wilbraham.com /history/athmerr.htm (2199 words)

	Sauk R. geol.map4
		New mapping north of the Sauk River quadrangle suggests that although the Napeequa Schist is generally distinct from other rocks of the Chelan Mountains terrane, namely the herein-restricted Cascade River Schist, it has been thoroughly imbricated or interfolded with them and may not be clearly mappable as a separate terrane unit.
		Most rocks of the Napeequa Schist are micaceous quartzites, fine-grained hornblende schist, and amphibolite derived from a protolith of oceanic chert and basalt.
		Mica schist and hornblende-mica schist probably derived from shale and sandstone are common but not unique to the unit.
	wrgis.wr.usgs.gov /wgmt/pacnw/nc/sr4.html (1078 words)

	Bedrock Geological Map of Connecticut
		Manhattan Schist: dark-gray to silvery, rusly-weathering, coarse-grained schistose
		Light to dark, green, medium- to coarse-grained schist; typically consisting of the green minerals: chlorite, epidote, or actinolite.
		Dark-colored, medium-grained intrusive igneous rock occurring as dikes; composed of biotite, hornblende, pyroxene, and feldspars or feldspathoids.
	www.tmsc.org /geology/bedrock/info.htm (1597 words)

	A NEW MINERAL FIND IN GWINNETT GOUNTY GEORGIA
		Occurs as small rounded translucent very light green to clear crystal aggregates in vugs in hornblende schist with pyrite, chalcopyrite, and chlorite.
		Found in quartz/feldspar veins in hornblende matrix adjacent to the granite body.
		Pyrite and chalcopyrite microcrystals are associated with the calcite.
	www.gamineral.org /new-micro-find.htm (1175 words)

	Summary of Citation (Site not responding. Last check: 2007-09-22)
		About half of the formation is silicic tuff metamorphosed to white schist that probably originated as crystal and lithic tuffs or as porphyritic flows.
		Green metavolcanic schist (colored by prochlorite) that ranges from schistose to massive is next in abundance.
		Chloritic hornblende schist distinguished by large prisms of hornblende in a finely schistose greenish-gray groundmass is interlayered with other rock types.
	ngmdb.usgs.gov /Geolex/Refsmry/sumry_8106.html (333 words)

	Metamorphic
		The combination forms in the menu, for example "hornblende schist", may help you to narrow searches.
		The results of a search using "schist" would include all of the samples returned by a search using "hornblende schist", plus more.
		Because the database includes rock names assigned over the course of more than 35 years, there is a mixture of older and newer terminology, of field names and more formal names, and of different terms for the same concept.
	www.lcsc.edu /hellscanyon/metamorphic.htm (162 words)

	[No title] (Site not responding. Last check: 2007-09-22)
		This means that it has been subjected to more heat and pressure than slate, which is a low grade metamorphic rock.
		Schists are usually named by the main minerals that they are formed from.
		Bitotite mica schist, hornblende schist, garnet mica schist, and talc schist are some examples of this.
	volcano.und.nodak.edu /vwdocs/vwlessons/lessons/Metrocks/Metrocks8.html (112 words)

	Geologic Map of Georgia -- Legend
		Quartz Mica Schist / Hornblende Schist / Biotitic Gneiss
		Calcareous Mica Schist / Micaceous Marble / Mica Schist
		Undifferentiated Metavolcanics / Sericite Phyllite / Meta-Argillite / Quartz Mica Schist
	home.att.net /~cochran3/rocks01/ggmleg01.htm (233 words)

	Yukon Digital Geology
		quartz-chlorite-sericite schist, epidote-actinolite greenschist, quartzite, slate, quartz-mica schist, limestone
		medium to dark green weathering chlorite (+/-biotite) schist, amphibolite, banded amphibolite gneiss, garnet amphibolite; minor chloritic quartz-mica schist, graphitic quartz-mica schist, quartzite, and limestone
		dark grey to brown, biotite-muscovite-quartz-feldspar schist, quartzite and micaceous quartzite, garnetiferous; felsic chlorite-biotite orthogneiss; rare amphibolite; minor(?) two-mica gneiss and hornblende diorite gneiss; may include Nasina Assem.
	www.geology.gov.yk.ca /gallery/bedrock_legend/colb.html (2088 words)

	Raleigh Belt (Site not responding. Last check: 2007-09-22)
		CZms - MICA SCHIST - Contains garnet, staurolite, kyanite, or sillimanite; includes lenses and layers of quartz schist, micaceous quartzite.
		CZig - INJECTED GNEISS - Biotite gneiss and schist intruded by numerous sills and dikes of granite, pegmatite, and aplite; minor hornblende gneiss
		CZfg - FELSIC MICA GNEISS - Interlayered with graphitic mica schist and mica-garnet schist, commonly with kyanite; minor hornblende gneiss
	www.geology.enr.state.nc.us /usgs/raleigh.htm (310 words)

	[No title] (Site not responding. Last check: 2007-09-22)
		A felsic plutonic rock, generally adamellite or granodiorite, containing
		an amphibole (often hornblende) as an essential dark-colored constituent;
		A schistose metamorphic rock consisting principally of hornblende, with
	www.maden.hacettepe.edu.tr /dmmrt/dmmrt564.html (625 words)

	[No title]
		199)Moro Phillips' chromite minePserpentine, chromite, magnetite, anthophyllite, chlorite, talc, quartz, limoniteTilly Foster iron minelmagnetite, pyrrhotite, microcline, bronzite, hornblende, enstatite, tremolite, tourmaline, calcite, dolomiteserpentine, dolomite, gneissHistoric site name as reportedHost rock(s) reporteduGenth (1875, p.
		161)Wissahickon Valley occurrenceuserpentine, actinolite, tremolite, hornblende, chlorite, talc, dolomite, fluorite?, chalcopyrite, magnetite, chromite5Rand and others (1893, p.
		22); Chidester and Shride (1962)2enstatite, hypersthene, talc, actinolite, chlorite pyroxeniteCoosa River News Print property>enstatite, hypersthene, bronzite, talc, serpentine, tourmalineJennings-Satterwhite propertiesserpentinite, pyroxenitedhornblende gneiss, amphibolite, pyroxenite, hornblende gabbro, hornblende diorite, actinolite schist ReferencesGASoapstone Ridge occurrences tremoliteKtalc, chlorite, cummingtonite,
	pubs.usgs.gov /of/2005/1189/downloads/asbestos_sites.xls (829 words)

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