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Topic: Hypersthene

	HYPERSTHENE (Magnesium Iron Silicate)
		Hypersthene is a relatively common mineral and is found in igneous and some metamorphic rocks as well as in stony and iron meteorites.
		Hypersthene is the intermediate member with around 50% iron and ferrosilite is the iron rich end member of the series.
		Hypersthene is an orthopyroxene or a pyroxene with an orthorhombic symmetry.
	mineral.galleries.com /minerals/silicate/hypersth/hypersth.htm (408 words)

	Summary of Citation
		Hypersthene syenite intrudes the marginal areas on the west, northwest, and southeast.
		Syenite (hypersthene and hornblende) on the western border are not included in the complex.
		Is intruded by late stage hypersthene and hornblende syenite on north, northwest, and southeast.
	ngmdb.usgs.gov /Geolex/Refsmry/sumry_9268.html (902 words)

	Hypersthene
		Hypersthene is the intermediate member of the enstatite-ferrosilite series.
		Hypersthene is a common mineral in stony-iron meteorites and some igneous and metamorphic rocks.
		The name hypersthene comes from the Greek words hyper "very" and sthene "strong" because it is stronger than hornblende despite a superficial resemblence.
	www.museums.udel.edu /mineral/mineral_site/collection/alphabetical/H/hypersthene.html (73 words)

	Tephra Set X--PRE-1980 TEPHRA-FALL DEPOSITS ERUPTED FROM MOUNT ST. HELENS, WASHINGTON
		Some hypersthene crystals in the lower part of the set have relatively high refractive indexes similar to those in set W; the few hypersthenes examined from the upper part of the set do not.
		The presence in set X of dacitic inclusions in mafic fragments, banded clasts, and hypersthene phenocrysts similar to those in set W suggest that mixing of the two magmas was an important cause of the eruptions that produced the set (Pallister and Hoblitt, 1985; Pallister and others, 1992).
		A few hypersthene phenocrysts examined had lowest refractive indexes well above 1.70 and thus are similar to hypersthene phenocrysts in set W. Layer Xb is readily distinguished from underlying and overlying dacitic layers by dark color and mafic composition and from set B layers by stratigraphic position and ferromagnesian minerals.
	pubs.usgs.gov /pp/p1563/tephrasetx.html (3613 words)

	Hypersthene - Wikipedia, the free encyclopedia
		Hypersthene is a common rock-forming inosilicate mineral belonging to the group of orthorhombic pyroxenes.
		The name has now been formally abandoned and enstatite or ferrosilite is preferred.
		The name hypersthene comes from the Greek and means "over strength".
	en.wikipedia.org /wiki/Hypersthene (299 words)

	MYRMEKITE 13 OF 50
		Some facies of the Bonsall tonalite lack hypersthene and contain biotite and hornblende as the dominant ferromagnesian silicates (west contact with leucogranite at Mount Rubidoux and south and east of Quarry Hill).
		Hypersthene and fayalite in the leucogranite are unlikely inherited from Bonsall tonalite in the wall rock.
		Hopson and Ramseyer (1990b) suggested that the occurrence of fayalite and hypersthene in the leucogranite resulted during late-stage losses of water pressure during pluton emplacement.
	www.csun.edu /~vcgeo005/rubidoux.htm (3700 words)

	All About the Properties and Locations of Hypersthene (Site not responding. Last check: 2007-11-04)
		Hypersthene or Labrador hornblende is found in crystalline masses and is used for ornamental purposes
		Handsome specimens of hypersthene or Labrador hornblende are used for ornamental purposes.
		Hypersthene occurs in dark-brown, green, grayish-fl, greenish-fl, and jet-fl colors, and is found in the isle of Skye, the Hartz Mountains, Saxony, Labrador, Greenland, Norway, Sweden, Bohemia, Thuringia, and the United States.
	www.jjkent.com /articles/hypersthene-properties-locations.htm (168 words)

	Geochemistry part 2
		Most of those samples with diopside or diopside and hypersthene in their norms, the least-altered samples, fall in the field of weakly iron-rich rocks (area enclosed by an ellipse in Figure 79B).
		Most of those with hypersthene as the only normative ferromagnesian mineral and with albite (or oligoclase) as their normative plagioclase feldspar, the potassically-altered rocks, are weakly iron-rich to strongly iron-poor (that is they are displaced in the direction of the arrow shown in Figure 79B).
		This ratio is somewhat lower (~2.3) in samples with normative diopside and hypersthene and with oligoclase as the normative plagioclase feldspar.
	www.fortunecity.co.uk /safaripark/lamprey/108/chem2.htm (4288 words)

	ENSTATITE (Magnesium Silicate)
		Enstatite is a relatively common mineral and is found in metamorphic and some igneous rocks as well as in stony and iron meteorites.
		Hypersthene is fairly common but ferrosilite is extremely rare.
		An emerald green variety of enstatite is called chrome-enstatite and is cut as a gemstone.
	mineral.galleries.com /minerals/silicate/enstatit/enstatit.htm (477 words)

	Bronzite - Wikipedia, the free encyclopedia
		Bronzite is a member of the pyroxene group of minerals, belonging with enstatite and hypersthene to the orthorhombic series of the group.
		The ferriferous varieties are liable to a particular kind of alteration, known as schillerization, which results in the separation of the iron as very fine films of oxide and hydroxides along the cleavage cracks of the mineral.
		Like enstatite, bronzite is a constituent of many basic igneous rocks, such as, norites, gabbros, and especially peridotites, and of the serpentines which have been derived from them.
	en.wikipedia.org /wiki/Bronzite (429 words)

	Gemstones beginning with H
		The name hypersthene (HIGH-purse-theen) is of Greek origin: hyper, meaning "extreme" or "above," and sthenos, "strength." It alludes to the stone having greater hardness than that of hornblende, an amphibole mineral with which hypersthene is often confused.
		Hypersthene is indeed a rare form of enstatite, but some of the magnesium found in enstatite has been replaced by iron.
		Hypersthene is found on the Isle of Skye, England (Saxony), Canada (Labrador), Greenland, Norway, Sweden, the Czech Republic and the U.S.A..
	www.rings-things.com /gemstone/h.htm (1368 words)

	Glossary for the Geology of Mount Shasta
		Andesites are typically gray or fl in color and contain visible crystals of plagioclase, augite, and hypersthene (Figure 5).
		Dacites are typically gray to pink in color and contain visible crystals of plagioclase, hypersthene, and hornblende (Figure 5).
		Debris avalanche: Dense, incoherent mixture of water, rock, and soil that flows downslope at speeds of 40 to 200 kilometers/hour (25 to 125 miles/hour).
	www.siskiyous.edu /shasta/geo/glo.htm (1094 words)

	The Astrodigital Online Dictionary of Meteoritics
		In a geological context, it is the occurrence in a rock of small-grained materials that form a network in the spaces between larger-grained materials.
		One of the groups of Stoney-iron meteorite, it is composed equally of nickel-iron and silicates, with the silicates being primarily hypersthene and plagioclase.
		One of the subgroups of ordinary chondrites, it is designated as Group-L. These meteorites contain olivine and hypersthene and a free metal content of 7-12%.
	www.astrodigital.org /astronomy/metdict.html (2090 words)

	orthopyroxene.htm (Site not responding. Last check: 2007-11-04)
		Bronzite and hypersthene are orthopyroxenes mid-way between these two end members.
		ASHLAND COUNTY: Hypersthene occurs as individual grains or lamina in augite in gabbros of the Mineral Lake and related plutons where it occurs with plagioclase, augite and olivine.
		BAYFIELD COUNTY: Hypersthene occurs as individual grains or lamina in augite in gabbros exposed throughout sec.
	www.uwrf.edu /~W1014120/orthopyroxene.htm (441 words)

	Olympus Microscopy Resource Center: Polarized Light Microscopy Gallery - Norite
		Similar to gabbro, norite is a type of coarse-grained igneous rock found on both the moon and the Earth.
		The definitive difference between the two substances is that the dominant mafic material in norite is the splintery orthopyroxene mineral hypersthene.
		Norite typically occurs as discrete intrusive masses or as layers in large, basic intrusions of other materials, as do gabbros, and the two cannot generally be distinguished from one another without the aid of a microscope.
	www.olympusmicro.com /galleries/polarizedlight/pages/noritesmall.html (180 words)

	Metamorphic Mineral Assemblages
		Calcareous rocks would consist either of wollastonite, grossularite and diopside, or grossularite, plagioclase, and diopside, or plagioclase, diopside, and biotite, depending on the composition of the initial rock.
		Basic rocks would consist of plagioclase, diopside, and almandine/pyrope, or plagioclase, hypersthene, and almandine/pyrope.
		Ultramafic rocks would consist of hypersthene, almandine/pyrope, and diopside.
	www.tulane.edu /~sanelson/geol212/metaminerals.htm (1958 words)

	Hypersthene - LoveToKnow 1911
		Read LoveToKnow 1911:Explanation to get more explanation and see how you can help!
		HYPERSTHENE, a rock-forming mineral belonging to the group of orthorhombic pyroxenes.
		It differs from the other members (enstatite [q.v.] and bronzite) of this group in containing a considerable amount of iron replacing magnesium: the chemical formula is (Mg,Fe)SiO i.
	www.1911encyclopedia.org /Hypersthene (196 words)

	Potential Meteorites from the Mercury Parent Body (Site not responding. Last check: 2007-11-04)
		The original igneous pyroxene of cumulate eucrites was pigeonite, which has subsequently undergone subsolidus exsolution of augite and, in some cases, inversion to orthopyroxene, with additional augite exsolution.
		Binda is the most magnesian of the cumulate eucrites, and the only one classified by Delaney et al.
		(1976) have shown that the original pyroxene in Binda was a low-Ca pigeonite that exsolved augite and inverted to hypersthene.
	www.mars.li /mercury-meteorites.htm (1082 words)

	Hypersthene Beads, Wholesale Hypersthene Beads, Hypersthene Gemstone Beads -HouseOfGems.com
		Hypersthene Beads, Wholesale Hypersthene Beads, Hypersthene Gemstone Beads -HouseOfGems.com
		Each smooth large nugget shape bead is approximately 30x40mm.
		Each smooth rectangle shape bead is approximately 12x20mm.
	www.houseofgems.com /Product_results.asp?beads=Hypersthene-beads&catcode=1&SubCategoryID=170 (130 words)

	Meteorite - MARE Meteoritics
		Beaver, Beaver County, Oklahoma - Olivine Hypersthene Chondrite, L5 Bilanga, Gomponsago, Burkina Faso, Africa - Achondrite, Diogenite, ADIO
		Mt. Tazerzait, Tahoua, Niger - Olivine Hypersthene Chondrite, L5 New Orleans, Louisiana - Ordinary Chondrite, H5 Northbranch, Jewel County, Kansas - Olivine Bronzite Chondrite, H5 Northwest Africa 243, Morocco - Olivine Bronzite Chondrite, H5 Northwest Africa 515, Morocco/Algeria - Olivine Hypersthene Chondrite, L6 Northwest Africa 753, Morocco - Rumurutite Chondrite, R3.9
		Seibert b, Kit Carson County, Colorado - Olivine Hypersthene Chondrite, L6 Springer, Carter County, Oklahoma - Olivine Bronzite Chondrite, H5 Tatahouine, Foum Tatahouine, Tunisia - Achondrite, Ca-Poor.
	www.meteorflash.com (812 words)

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