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	Hornblende
		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.
	www.marble.com /countertops/encyclopedia/49/hornblende.html (312 words)

	hornblende.htm
		The hornblende is associated with plagioclase, biotite and zircon (Wilcox, 1936).
		Hornblende is common as small grains in amphibolites and cross-cutting diorite dikes in outcrops along the Chippewa River at Holcombe Dam (SW Sec.
		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)

	Hornblende - LoveToKnow 1911
		The pleochroism is always strong, and the angle of optical extinction on the plane of symmetry (x in the figure) varies from o° to 37°.
		The dark.-coloured porphyritic crystals of basalts are known as basaltic hornblende.
		Hornblende occurs as an essential constituent of many kinds 1 Buffon, as was his manner, enlarges on the cruel injustice done to these birds by Nature in encumbering them with this deformity, which he declares must hinder.them from getting their food with ease.
	www.1911encyclopedia.org /Hornblende (297 words)

	[No title] (Site not responding. Last check: )
		Hornblende's strong pleochroism and inclined extinction are its most distinctive characteristics.
		Hornblende is common in many intrusive igneous rocks ranging from granite to gabbro; it is also present in medium grade metamorphosed mafic rocks.
		Hornblende occurs in some volcanic rocks, but it is less abundant in extrusive rocks than in intrusive rocks.
	sorrel.humboldt.edu /~jdl1/web.page.images/hornblende1.html (147 words)

	Hornblende
		(Hornblende) The mineral hornblende is a complex silicate which is an isomorphous mixture of three molecules; a calcium-iron-magnesium silicate, an aluminium-iron-magnesium silicate, and an iron-magnesium silicate.
		Hornblende has a hardness of 5 - 6, a specific gravity of 2.9 - 3.4, and is colored green, greenish-brown, opaque, brown and fl.
		Hornblende is a common constituent of many igneous rocks such as granite, syenite, diorite or gabbro, of gneisses and schists, and is the principal mineral of amphibolites.
	www.xasa.com /wiki/en/wikipedia/h/ho/hornblende.html (194 words)

	Bulletin No.28
		V-1): hornblende gabbro and diorite distributed near Kawaura, Jinza-san, Ochiai, and the upper reaches of the Magi River; biotite-hornblende tonalite chiefly in the southern part of the batholith; biotite-hornblende granodiorlte and hornblende-biotite granodiorite in the main.
		Hornblende occurs as a discrete crystal of up to 4 mm in length or as an aggregate of fibrous crystals accompanied by fibrous cummingtonite.
		The mode of biotite is generally higher than that of hornblende in the northern part of the batholith, whereas that of hornblende is higher than that of biotite in the southern part.
	www.um.u-tokyo.ac.jp /publish_db/Bulletin/no28/no28005.html (2309 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: )
		Hornblende is not a recognized mineral, in its own right but the name 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.
		The word hornblende is derived from the German horn and blenden, to 'blind' or 'dazzle'.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=hornblende (298 words)

	USGS: Geological Survey Professional Paper 3 (Part 2)
		The hornblende in these dark-colored secretions is partially idiomorphic and partially allotriomorphic, with the latter tendency decidedly the stronger; that is, crystal forms may be developed on part of a crystal while the rest has a very irregular outline.
		The hornblende of these secretions does not contain inclusions of glass, but it is very apt to contain inclusions of the other phenocrysts so as sometimes to be filled with them, somewhat after the manner of inclusions in the hornblende of the crystalline schists.
		This is more especially true of hornblende, which, with possibly one minor exception, is absolutely foreign to the andesites as well as to the basalts of Crater Lake, but which occurs with the same colors and other properties, although very sparingly, in nearly all the thin sections of dacites studied.
	www.cr.nps.gov /history/online_books/geology/publications/pp/3/part2-2c.htm (5242 words)

	hornblende - Encyclopedia.com
		clinopyroxene (0.4-0.7 mm in length), 10% brown hornblende (0.4-0.8 mm in length), and 5% quartz...
		with quartz, plagioclase, biotite, hornblende, metamorphic, fine-grained volcanic...
		sand with quartz, plagioclase, biotite, hornblende, welded rhyolitic tuff fragments), and...
	www.encyclopedia.com /doc/1E1-X-hornblen.html (1015 words)

	hornblende - Search Results - MSN Encarta
		Hornblende, group of translucent to opaque silicate minerals, typically of general formula Ca Na(Mg,Fe)
		Peridotite, igneous rock composed of pyroxene, olivine, and hornblende.
		alabaster, basalt, chalk, conglomerate, flint, gneiss, granite, hornblende, lava, limestone, malachite, marble, pumice, quartzite, sandstone, schist,...
	encarta.msn.com /hornblende.html (93 words)

	Sunny
		Hornblende is made up of 8 different elements which 7 are of the Earth's top 8 in abundance.
		Hornblende is an Amphibole, which is a double chained inosilicate that has a silicon oxygen ratio of 4:11.
		They say, "The composition of hornblende and the coexisting phases defines the thermal history of the erupting magma." For as diverse in compositional options as hornblende is, you can figure out what type of environment hornblende formed under by its composition.
	www.msu.edu /~will1105/hornblende.htm (413 words)

	Petrography and Lithology Part Two
		Hornblende is scarce or absent in rocks that have undergone potassic alteration.
		The hornblendes are edenite in composition (Figure 32A) whereas the actinolites are actinolite or actinolite hornblende (Figure 32B).
		Hornblende was found in one drill core sample each of feldspar porphyry and phanerite from the Sydney Intrusion north of Folomian (DDH-331) and in several specimens from the Kalgoorlie and Ningi intrusion.
	www.fortunecity.co.uk /safaripark/lamprey/108/pnlith2.htm (4161 words)

	pg 05: Description of the Llano and Burnet Quadrangles, Texas (1912) Publication 301083
		The hornblende has a blue pleochroism parallel to the elongation (C), and extinction angles as high as 18°.
		An examination of numerous specimens revealed an abundance of microcline, with orthoclase, albite-oligoclase, biotite, quartz, and hornblende.
		Several hornblende granites were noted, but their distribution is limited.
	www.lib.utexas.edu /books/landscapes/publications/txu-oclc-301083/txu-oclc-301083-05-print.html (2127 words)

	USGS: Geological Survey Bulletin 1359: Geology and Mineral Resources of the Northern Part of the North Cascades ...
		This unit, which is principally made up of biotite and hornblende gneisses, forms the bedrock in the southeast quarter of the area and from there northwestward is present as isolated remnants surrounded by batholithic rocks.
		Most of the hornblende metagabbro is massive; locally, it is gneissose or schistose or sheared in zones a few inches wide.
		The quartz diorite is composed of 50 percent plagioclase, 30 percent quartz, 5 percent potassium feldspar, and 15 percent biotite and hornblende, as well as accessory sphene, apatite, magnetite, and zircon.
	www.cr.nps.gov /history/online_books/geology/publications/bul/1359/sec1.htm (4609 words)

	Definition of Hornblende from dictionary.net
		Some common varieties are tremolite, actinolite, asbestus, edenite, hornblende (the last name being also used as a general term for the whole species).
		Amphibole is a constituent of many crystalline rocks, as syenite, diorite, most varieties of trachyte, etc. See Hornblende.
		Hornblende schist (Geol.), a hornblende rock of schistose structure.
	www.dictionary.net /hornblende (177 words)

	MYRMEKITE 23 OF 50
		The mineral relationships and the occurrence of angular enclaves of diorite and meladiorite are characteristic of crystallization from a melt and are in agreement with a magmatic origin.
		The presence of hornblende and biotite suggests that the former rock could have been a hornblende diorite.
		Quartz sieve textures occur in the biotite and hornblende (Fig.
	www.csun.edu /~vcgeo005/scotland.htm (4253 words)

	Bulletin No.28
		Hornblende commonly occurs as a euhedral to subhedral prismatic crystal with a maximum length of 2 mm.
		Hornblende from the batholithic rocks is generally identified as magnesio-hornblende, ferro-hornblende, actinolitic hornblende, and ferroactinolitic hornblende with small amounts of actinolite and ferroactinolite, according to the nomenclature of Leake (1978) (Fig.
		Hornblende in magnetiteseries rocks (0.420 to 0.896; mean 0.674) is lower in atomic Fe +Fe) ratios than hornblende in ilmenite-series rocks (0.541 to 0.926; mean 0.711).
	www.um.u-tokyo.ac.jp /publish_db/Bulletin/no28/no28007.html (794 words)

	Black Canyon of the Gunnison National Park - Schist (U.S. National Park Service)
		There are two kinds of schists found in the canyon, either a mica-rich schist, that has a lot of biotite and muscovite mica, or a schist rich in hornblende, a type of mineral called amphibole.
		Like the essential building block of plagioclase, hornblende is actually a member of the solid solution series for amphiboles.
		Hornblende is the most common occurring amphibole in the canyon and is fl or dark green in color.
	www.nps.gov /blca/naturescience/schist.htm (510 words)

	The Granite Industry - Page 1
		Hornblende is more desirable than mica as a constituent of granite, having cleavage in two planes instead of one, as in mica, and polishing much more easily.
		Hornblende granite.-In addition to the hornblende contained in this granite as the characterizing accessory, fl mica is in nearly all cases likewise found.
		Biotite is found as a microscopic constituent in many hornblende granites, and the name "hornblende granite" is, therefore, restricted to those in which no biotite is visible to the naked eye.
	www.cagenweb.com /quarries/articles_and_books/us_geo_survey1894_granite.html (1712 words)

	Re: Hornblende schist by Alan Plante on 1/11/2002
		All calling that schist "hornblende schist" means is that the primary or most conspicuous mineral in it is hornblende.
		A nickname for them is "chain silicates." Hornblende is a member of the Amphibole Group of the Inosilicate Superclass.
		"Hornblende" is actually the name of what is called a "solid solution series," not a mineral species.
	www.rockhounds.com /rocknet/archive/messages/13800.shtml (644 words)

	HORNBLENDE - Online Information article about HORNBLENDE
		common hornblende includes the greenish-fl and fl kinds containing more iron.
		Hornblende occurs as an essential constituent of many kinds See also:
		Buffon, as was his manner, enlarges on the cruel injustice done to these birds by Nature in encumbering them with this deformity, which he declares must hinder them from getting their See also:
	encyclopedia.jrank.org /HIG_HOR/HORNBLENDE.html (900 words)

	Hornblende (Site not responding. Last check: )
		Hornblende is one of the basic silicate minerals.
		Hornblende is the most common example of the group of silicates called amphibole.
		It is usually dark green to fl in color and is similar to augite.
	hyperphysics.phy-astr.gsu.edu /hbase/minerals/hornblende.html (115 words)

	SDNHM - Hornblende
		A common rock-forming mineral, hornblende can be found in granite, basalt, diorite, schist, and gneiss.
		Although hornblende is a common mineral that is found in various rock types, it has almost no commercial value.
		Field Notes: Hornblende is generally a greenish-fl color and cleaves at 60° and 120° angles.
	www.sdnhm.org /fieldguide/minerals/hornblende.html (112 words)

	The provenance of erratics on the Stony Brook Campus based on Ar-Ar ages of mica and hornblende (Site not responding. Last check: )
		Single grain Ar-Ar ages for biotite, muscovite and hornblende have been obtained on representative erratic boulders on the Stony Brook Campus to test the hypothesis that most of the boulders are from the basement of Long Island Sound (Pacholik and Hanson, 2001).
		Muscovite, biotite and hornblende grains were co-irradiated with hornblende monitor standard Mmhb (age = 525 Ma, Samson and Alexander, 1987) in the Cd-lined, in core facility (CLICIT) at the Oregon State reactor.
		The single grain Ar-Ar ages for mica and hornblende support the hypothesis that the boulders on the Stony Brook Campus were derived from the basement in Long Island Sound and that the basement is dominated by Avalonian terrane granites and gneisses.
	www.geo.sunysb.edu /lig/Conferences/abstracts_02/pacholik/pacholik-abs.htm (1953 words)

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