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Topic: Chromite


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In the News (Wed 17 Apr 19)

  
 EPA: Federal Register: Chromite Ore from the Transvaal Region of South Africa; Toxic Chemical Release Reporting; ...
Chromite Ore--Current Petition On January 26, 1998, EPA received a petition from Elementis Chromium LP (ECLP) (formerly American Chrome Chemicals, Inc.) requesting the delisting of both chromite ore mined in the Transvaal Region of South Africa and the unreacted ore component of the chromite ore processing residue (COPR).
The inclusion of chromite ore as a carcinogen by MSHA was based on the assumed conversion of Cr(III) in the ore to Cr(VI), a known carcinogen (Ref. 8).
Petition to Delist Chromite Ore from SARA 313.
www.epa.gov /fedrgstr/EPA-TRI/1999/February/Day-23/tri4318.htm   (4898 words)

  
 Chromite¬Ö   (Site not responding. Last check: 2007-10-13)
Chromite is the most important ore of chromium, and an important metal that has a wide range of industrial uses.
Chromite forms in deep ultra-mafic rocks such as peridotites and is also found in metamorphic rocks such as serpentines.
Chromite is resistant to the altering affects of high temperatures and pressures, as indicated by its early crystallization.
www.uvm.edu /~swgordon/131-01/131web/santinabrohen/Chromite.htm   (193 words)

  
 CHROMITE. The Columbia Encyclopedia: Sixth Edition. 2000   (Site not responding. Last check: 2007-10-13)
Its crystals are octahedral, but rare; it usually occurs as irregular, granular masses in association with igneous rocks, including ophiolites, which are segments of oceanic crust exposed on land by tectonic processes usually associated with plate convergence (see plate tectonics).
Chromitite is an igneous rock composed chiefly of the mineral chromite.
The only commercial source of chromium and its compounds, chromite is used in the manufacture of refractory materials.
www.bartleby.com /aol/65/ch/chromite.html   (81 words)

  
 Chromite - LoveToKnow 1911
CHROMITE, a member of the spinel group of minerals; an oxide of chromium and ferrous iron, FeCr 2 O 4.
It is also known as chromic iron or as chrome-iron-ore, and is the chief commercial source of chromium and its compounds.
The earliest worked deposits were those in the serpentine of the Bare Hills near Baltimore, Maryland, U.S.A.; it was also formerly extensively mined in Lancaster county, Pennsylvania, and is now mined in California, as well as in Turkey, the Urals, Dun Mountain near Nelson in New Zealand, and Unst in the Shetlands.
www.1911encyclopedia.org /Chromite   (335 words)

  
 PSRD: Tiny Traces of a Big Asteroid Breakup
The age of the limestone is very close to the impact age of many L chondrites suggesting that this major collision was the breakup of the L chondrite parent body, possibly the largest impact in the asteroid belt in the last few billion years.
Chromite grains from the fossil meteorites (red dots) compared to a representative sampling of H, L, and LL chondrites.
On the basis of the total original mass of recovered fossil meteorites as well as dispersed chromite grains, Schmitz and coauthors estimate that the flux of meteorites in the mass range from 10 to 1,000 grams was enhanced at least by a factor of 120±50 in the Ordovician period compared to today.
www.psrd.hawaii.edu /Mar04/fossilMeteorites.html   (2019 words)

  
 National Synchrotron Light Source
Chromite is a common accessory mineral occurring in most meteorites and in many mantle rocks.
With the ubiquitous presence of chromite, the CF and CT phases may be among the more important index minerals for tracking the natural transition sequence and P-T conditions in mantle rocks, shock-metamorphosed terrestrial rocks, and meteorites.
Chromite is a common accessory mineral that is a member of the spinel group of minerals, a group of oxides that have very similar structures.
www.nsls.bnl.gov /newsroom/science/2004/06-Chen.htm   (743 words)

  
 .html   (Site not responding. Last check: 2007-10-13)
Description: Chromite occurs as small grains in ultramafic rock associated with serpentine, talc, magnesite and brucite.
Chromite also occurs as small grains in serpentinite in the NW NW sec.
- Chromite occurs as microsocpic octahedral crystals in vugs in a mafic dike cutting granite in the County Quarry, in Cary township (NW sec.
www.uwrf.edu /~wc01/chromite.htm   (149 words)

  
 CHROMITE (Iron Chromium Oxide)
Chromite forms in deep ultra-mafic magmas and is one of the first minerals to crystallize.
While the magma is slowly cooling inside the Earth's crust, chromite crsytals are forming and because of their density, fall to the bottom and are concentrated there.
Usually magnesium is present in chromite substituting for the iron and in fact a solid solution series exists between chromite and the much rarer mineral magnesiochromite.
mineral.galleries.com /minerals/oxides/chromite/chromite.htm   (377 words)

  
 Maryland Geological Survey: Soldiers Delight Serpentine Barrens
In these two locations, chromite is a significant accessory mineral in the serpentine and was mined up until 1860.
The commercial source of the element chromium is exclusively in the mineral chromite, which when pure, is an iron chromate of the formula FeO.Cr It is a heavy, opaque, iron- to brown-fl mineral, with a pitchy luster, uneven fracture and hardness nearly that of steel.
The mineral chromite is widely disseminated in small quantities in the serpentine of Bare Hills and Soldiers Delight, but is is only at a few places that it occurred in payable quantities.
www.mgs.md.gov /esic/features/soldiers.html   (1036 words)

  
 Podiform Chromite - Mineral Deposit Profiles, B.C. Geological Survey   (Site not responding. Last check: 2007-10-13)
A lack of any sizable chromite occurrence in British Columbia may reflect the fact that most ophiolitic complexes in the province are of mid- ocean ridge affinity.
Occurrences of podiform chromite are found in ophiolitic ultramafic rocks in the Slide Mountain, Cache Creek and Bridge River terranes.
Chromite is also used in making refractory bricks for furnace linings.
www.em.gov.bc.ca /Mining/Geolsurv/MetallicMinerals/MineralDepositProfiles/PROFILES/M03.htm   (685 words)

  
 Writer's Guide to the PR Universe - Chromites
As he told the Shadow Rangers in the Chromite Cave, the Chromite's plan was for the Pink Shadow Ranger to guard the teens while the others captured Tommy so nothing would interfere with Porto's detonator.
Havoc said the Chromites, calling them his special troops and his robot warriors, felt no pain and had no need to breathe and thus were superb fighters both on land and underwater.
Turbo Megazord, the Chromites used their rod weapons to shatter the cockpit's front panel of glass and break in; more Chromites then entered the cockpit through the rear door, using their rod weapons to blast the Rangers out with red energy blasts.
www.rovang.org /wg/chromites.htm   (796 words)

  
 Formation Conditions of Platinum-Group Metals in Chromite Ores of the Kempirsai Ore Field
The PGE distributions in chromite ores of the Kempirsai deposits are shown in Tables 1 and 2.
In addition, chromite ores contain considerable amounts of minerals where platinum metals are not principal components, although their concentrations in such minerals can reach a few and sometimes several tens of a percent.
The authors hold the viewpoint that chromite ores were formed as a result of a fractionation in the magmatic melt of an immiscible chromite liquid, the stability of which was defined, in particular, by a high concentration of a fluid dissolved in the magma.
www.igem.ru /igem/chem/kempirsai/kempirsai.htm   (9140 words)

  
 magmatic deposits   (Site not responding. Last check: 2007-10-13)
The processes involved in the formation of chromite layers are fractional crystallization and gravity settling.
Chromite crystallizes into mineral grains within the silicate liquid and, because they are heavier than the liquid, they sink to form a cummulate layer at the base of the intrusive.
Podiform chromite deposits consist of pod to pencil-like, irregularly shaped massive chromite bodies and they are predominantly found within dunitic (olivine-rich) portions of ophiolite complexes.
earthsci.org /mineral/mindep/depfile/mag_dep.htm   (1191 words)

  
 Diamond & Indicator Mineral Anomalies
The chromite grains are also considered interesting on the basis of their chemistry with reasonably high Cr2O3 levels and several that have similar chemistry to chromite inclusions found in diamonds.
Limited sampling by MADE around the site of the first diamond returned very high picroilmenite counts with minor chromite of probably kimberlitic affinity.The indicator mineral anomaly at Selou is downstream of other occurrences at Fambina and the lack of infill sampling between the two means that a continuous dispersion train cannot be ruled out.
Chromite is present in low numbers in several samples and most of these do not exhibit diagnostic kimberlitic morphology.
www.africanmetals.com /ken_anomalies.htm   (849 words)

  
 Eildon Refractories Products > Chromite
Chromite sand has received increasing attention sine the late 1950's as a very effective moulding material for a variety of different reasons:
When Chromite and finely divided aluminium and carbon are heated, chromium is reduced.
Chromite spinel sand is the sand size fraction removed from the Chromite ore and because of its grain size is not commercially practical for reducing Ferro-chromium alloys.
www.eildonr.demon.co.uk /chromite.htm   (282 words)

  
 From the Cover: Natural occurrence and synthesis of two new postspinel polymorphs of chromite -- Chen et al. 100 (25): ...
(A) A chromite grain was transformed to a CT phase zone (CT) contacting with shock vein, and partially to a CF phase zone (CF) between the CT phase zone and the chromite zone (Ch) apart from the shock vein.
The CF phase occurs as lamella-like slices associating with a chromite matrix, and two to three sets of slices are observed.
The occurrence of high-pressure polymorphs of chromite in the
www.pnas.org /cgi/content/full/100/25/14651   (2190 words)

  
 Glasgow ePrints Service - Genesis of sulfide-rich chromite ores by the interaction between chromitite and pegmatitic ...
Sulfide-rich ores are spatially associated to the contacts between sulfide-poor chromite and pegmatitic olivine- norite dikes.
Mineralogical and chemical data indicate that the chromite ores of the Potosi Mine were modified by the intrusions of olivine-norite and gabbro dikes.
The interaction between preexisting sulfide-poor chromite ores and the intruding volatile-rich silicate melts produced strong brecciation, partial dissolution, and recrystallization (coarsening) of chromite.
eprints.gla.ac.uk /803   (464 words)

  
 The mineral chromite
There are not many occurrences of collectible Chromite specimens.
In the U.S., Chromite has come from the Bare Hills, near Baltimore, Maryland, and the Wood's Mine, near Texas, Lancaster Co., Pennsylvania.
Chromite is mined in many areas in California, in the counties of San Luis Obispo, Siskiyou, Fresno, Del Norte, and Glenn.
www.minerals.net /mineral/oxides/chromite/chromite.htm   (80 words)

  
 Chromite
The objectives of Operation CHROMITE were three-fold; neutralize the fortified Wolmi Island, which controlled access to Inchon Harbor; land and capture Inchon, 25 miles west of Seoul; seize Kimpo Airfield just south of Seoul; and, finally, capture the city of Seoul.
As part of his overall plan, General MacArthur envisioned that the Eighth U.S. Army (EUSA) would breakout of the Pusan Perimeter at the same time as the Inchon landing and push the North Korean Army northward, trapping it between the two forces.
On October 7, with North Korean forces in full retreat, the allies could declare Operation CHROMITE a total victory and arguably one of the most successful amphibious operations in military history.
korea50.army.mil /history/factsheets/chromite.shtml   (1343 words)

  
 Chromite in greenstone lavas from the Kanakasu area, Nanjo Massif of the Mesozoic Mino terrane, central Japan -- Agata ...
Chromite in greenstone lavas from the Kanakasu area, Nanjo Massif of the Mesozoic Mino terrane, central Japan -- Agata and Hattori 66 (4): 575 -- Mineralogical Magazine
Chromite in greenstone lavas from the Kanakasu area, Nanjo Massif of the Mesozoic Mino terrane, central Japan
Chromite occurs together with olivine as phenocrysts in basalts
minmag.geoscienceworld.org /cgi/content/abstract/66/4/575   (221 words)

  
 Foundry Management & Technology - Development to Proceed on Oregon Source for Chromite Sand   (Site not responding. Last check: 2007-10-13)
Chromite is used in the production of high-quality alloy steel castings, and backers of the new project say it has “improved heat-transfer characteristics” that “can modify and improve the surface characteristics of specialty steel or iron alloys.” Reportedly, the only current source of chromite for metalcasting is from underground mines in South Africa.
The Oregon deposit is called “extensive,” consisting of an unconsolidated mixture of chromite, zircon, garnet, ilmenite, magnetite and other commercially valuable minerals.
Chromite and garnet make up close to 70% of the valuable minerals in the ore.
www.foundrymag.com /full_story.php?WID=14564   (383 words)

  
 Mining Technology - Kemi Chromite and Ferrochrome Mine, Finland
In the 1950s, Finland’s Outokumpu started nickel production with a view to making stainless steel; open-pit chromite mining began at Kemi in 1966 and ferrochrome production in 1967 at nearby Tornio, which is located at the far northern end of the Gulf of Bothnia.
Total chromite recovery is around 80% and the capacity is 1.2Mt/y.
To load and transport waste and chromite from the Main Pit’s five orebodies, the contractor uses Caterpillar backhoe excavators loading 60t and 90t-payload haul trucks.
www.mining-technology.com /projects/kemi/index.html   (938 words)

  
 Resource Investor - Base Metals - SA Chromite Miners Selling More to China   (Site not responding. Last check: 2007-10-13)
Chromite ore is beneficiated into charge chrome or ferrochrome.
In 2003-04, Chinese imports of chromite ore rose 20% to 2.1-million tonnes from 1.7-million, which increased the output of Chinese ferroalloy producers and their market share.
Reduced local supplies of chromite ore could affect future investment in ferrochrome smelters in South Africa and the trend was appearing at the same time as an increase in foreign interest in South Africa's mining assets.
www.resourceinvestor.com /pebble.asp?relid=19575   (528 words)

  
 Chromite Mineral Data
Cummulate mineral found in ultramafic portions of layered mafic intrusions.
Comments: Chromite veins in yellow to green antigorite with picrolite, chromian antigorite and dolomite (polished section).
Gray-white with a brownish tint and brownish red internal reflections.
webmineral.com /data/Chromite.shtml   (339 words)

  
 CHAPTER IX: Operation CHROMITE: The Forces
Arthur assigned the code name, Operation CHROMITE, to the planned landing at Inch'on; and, on 6 September, he confirmed in writing what he had already told his major commanders orally, that D-day for Operation CHROMITE was September 1950.
Command of the expeditionary troops, the U.S. X Corps, was to pass to General Almond from Admiral Struble after the corps had landed and Almond had indicated that he was ready to assume command.
As D-day for Operation CHROMITE approached, the ports of Kobe, Sasebo, and Yokohama in Japan and Pusan in Korea became centers of intense activity.
www.army.mil /cmh-pg/books/pd-c-09.htm   (8812 words)

  
 Tata Steel is Asia's first and India's largest integrated private sector steel company
The Sukinda Chromite Mine (SCM) is the largest open cast chromite mine in India, comprising 3% of the country's total chromite lease area.
Prospecting for chromite in the Sukinda valley began way back in 1949 when Tata Steel's Prospecting Division first bought the occurrence of chromite to light.
Actual mining in SCM was started on a small scale in December 1960 to meet the requirements of refractory grade chrome ore using manual open cast working.
www.tatasteel.com /company/ORISSA_chromite.asp   (664 words)

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