Chromite - Wikipedia

Chromite is an iron chromium oxide: FeCr2O4. It is an oxide mineral belonging to the spinel group. Magnesium can substitute for iron in variable amounts as it forms a solid solution with magnesiochromite (MgCr2O4); substitution of aluminium occurs leading to hercynite (FeAl2O4). It is by far the most industrially important...

Chromite: The only mineral ore of chromium metal - Geology.com

It occurs in basic and ultrabasic igneous rocks and in the metamorphic and sedimentary rocks that are produced when chromite-bearing rocks are altered by heat ... Chromite is important because it is the only economic ore of chromium, an essential element for a wide variety of metal, chemical, and manufactured products.

Chromite: The mineral Chromite information and pictures

Detailed description, properties, and locality information guide about the chromium mineral chromite. ... with aluminum. Forms a series with the rarer mineral Magnesiochromite. ... are also known. Most commonly grainy, massive, in veins, as rounded pebbles, in rounded grains, and in nodular blobs embedded in rock.

Chromite: Chromite mineral information and data. - Mindat.org

'Chromite' is commonly used for any Cr-rich mineral of the spinel group, particularly for the chromite-magnesiochromite series, and much of the mineral referred to as 'chromite' ... The Fe-dominant species - Chromite itself - can be FOUND, although uncommonly, in many 'chromite' deposits, chromitite (rock name), and other...

Minerals | Chromite

Chromite occurs as a primary accessory mineral in basic and ultrabasic igneous rocks. Economic deposits form by crystallisation of chromite from a cooling magma, resulting in large stratiform deposits or smaller pod-like deposits. The most significant occur in large, layered, igneous intrusions in shield areas older than 1.9...

CHROMITE (Iron Chromium Oxide) - Amethyst Galleries

THE MINERAL CHROMITE. Chemical Formula: ... Chromite forms in deep ultra-mafic magmas and is one of the first minerals to crystallize. It is because of this fact that ... Although its primary origin is ultra-mafic rocks such as peridotites, chromite is also found in metamorphic rocks such as serpentites. Chromite, as is...

Discover chrome - GEOLOGY AND MINERALOGY

Chromium ore, or chromite, occurs exclusively in rocks formed by the intrusion and solidification of molten lava or magma which is very rich in the heavy, iron containing minerals such as pyroxenes and olivines. Within these rocks, often referred to as ultramafic igneous rocks, chromium occurs as a chromium spinel, a highly...

Chromite Mineral Data

Chromite Antigorite. Comments: Chromite veins in yellow to green antigorite with picrolite, chromian antigorite and dolomite (polished section). ... See Photo. © Jeff Weissman / Photographic Guide to Mineral Species ... Habit: Massive - Granular - Common texture observed in granite and other igneous rock. Help on Habit:...

Chromite | Earth Sciences Museum | University of Waterloo

Back to Rocks and Minerals Articles. Kathy Feick. Chromite is the main source of the metal chromium, a metal used to induce hardness, toughness and chemical resistance in steel. It was named after its chemical composition, chromium oxide. The mineral is brownish to black in colour with a dark brown streak. It has a...

Origin of chromite ores and surrounding hyperbasites

ene) in the chromite ores and in the hyperbasites. For f = Fe2 +/( Mg + Fez+) this similarity is illustrated in Figure 1, which is based on the mean compositions of these minerals for vari- ous types of hyperbasites (table 1). The dia- gram also shows data on the olivine-spinel rock-forming associations of hyperbasites in the Ural...

Rock and Mineral Uses from Rockman - RocksandMinerals.com

How we use and depend on rocks and minerals every day to maintain our standard of living. ... Chromite — A mineral ore of chromium which is used in making steel, "chromed' parts for automobiles and appliances and in the manufacture of chromic acid which is used to tan much of the leather used in making shoes, belts,...

Ore minerals - Mineralogical Society of America

Cesium - The major ore mineral is pollucite, a pegmatite mineral. Production and use of this metal is extremely small (a few thousand kilograms per year). Chlorine - Produced from the mineral halite (rock salt). Chromium - The chief source is the mineral chromite which is found in large layered intrusives and serpentine...

Origin of Chromite Deposits - GeoScienceWorld

perfection of crystal form. In unaltered rocks chromite of early magmatic origin is usually characterized by lack of fracturing. Forms may be euhedral and subhedral. The subhedral forms probably originate through corrosive action by the solutions that carried the constituents that formed the groundmass minerals. Chromite of...

How to Identify Black Minerals - ThoughtCo

Aug 19, 2017 ... De Agostini Picture Library/Getty Images. This mica mineral forms shiny, flexible flakes of a deep black or brownish-black color. Large book crystals occur in pegmatites and it is widespread in other igneous and metamorphic rocks; tiny detrital flakes may be found in dark sandstones. Glassy to pearly luster;...

Peridotite (Dunite) - Geology - rocks and minerals

Peridotite (Dunite) is a very dense, coarse-grained, olivine-rich, ultra-mafic intrusive rock. It is noted for its low silica content, and contains very little or no feldspar (orthoclase, plagioclase). It is a common component of oceanic lithosphere, and is derived from the upper mantle. It is found on land as part of oceanic crust...

The Learning Zone: How We Use Minerals

In the kitchen ... Minerals used to make stainless steel cutlery. Magnetite and goethite are minerals that contain a lot of iron and are used to make steel. Steel is mixed with chromium to stop it from rusting. Chromium comes from the mineral chromite. Together, these minerals make stainless steel: Strong; Rigid; Hard...

Cr – Chromium

As a result, Cr is enriched in ultramafic rocks. (1000–3000 mg kg-1), along with elements such as. Ni. While the principal Cr ore mineral, chromite, is generally mined from ultramafic rocks, it is also a major carrier of Cr in basaltic magmas, along with Cr-enriched magnetite and ilmenite. (Wedepohl 1978). Olivine is generally...

Chromite - Sandatlas

Chromite in igneous rocks may form bands or layers which are very important mineral resources. These layers are the result of a crystal settling in a magma chamber. Such deposits are for example Bushveld complex in South Africa and the Great Dike in Zimbabwe. It is among the first minerals to crystallize out of magma.

Geology and Mineral Resources of Orissa - Odisha Minerals ...

metasedimentary rocks including Iron Ore Super Group having deposits of iron, manganese, gold and basemetals. These are also represented by the gneisses, granite, migmatite (Singhbhum, Bonai and Mayurbhanj Plutons) and mafic/ ultramafic intrusives. These intrusives are associated with the chromite, titaniferous...

Chromite is an iron chromium oxide mineral and the only ore of ...

Chromite is an iron chromium oxide mineral and the only ore of chromium metal. It is a mineral ... It is also found in serpentines and other metamorphic rocks derived from the alteration of ultrabasic rocks. It is a high ... Certain types of garnet along with chromite and ilmenite can be indicator minerals for diamond prospecting.

Refractory- and metallurgical-type chromite ores, Zambales ophiolite ...

The terms chrome-spinels and chromite are used as follows: 1. Chrome-spinel is only used for those occuring as accessory minerals in various ultramafic and mafic rocks (= accessory chrome-spinels). Their chemical composition has been determined only by microprobe analysis. — 2. Chromite is used for ore and ore...

Mineral Standards

Augite is an important rock-forming ferromagnesian mineral in many igneous rocks and is also found in some ... The table below shows the chemical composition of a chromite having an empirical formula of CaCO3 and a molecular ... Chromite forms in deep ultra-mafic magmas and is one of the first minerals to crystallize.

How to Identify Platinum in Ore Deposits | Sciencing

Apr 25, 2017 ... It is also very malleable, and the hammer should leave an impression on platinum. Examine nearby minerals. Platinum often forms with chromite, olivine, gold, enstatite, pyroxene and magnetite. The presence of one or more of these minerals near the metal under examination indicates a higher probability...

Chromite | Define Chromite at Dictionary.com

Mineralogy. a cubic mineral, ferrous chromate, Fe 3 Cr 2 O 3, usually with much of the ferrous iron and aluminum replaced by magnesium, and some of the chromium by ferric iron: the principal ore of chromium. Origin of ... chromite is a common minor constituent of basic igneous rocks of the peridotite and pyroxenite type.

Mineral Sector - Invest in Manipur

MINERAL SECTOR. Minerals in Manipur are mainly confined to certain types of rocks such as ophiolite suite, Oceanic Pelagic Sediment (OPS) and melanges in the Ophiolite Belt. Amongst these, chromite, limestone and serpentinites (as dimensional stone) are important for immediate exploitation. Other minerals are...

Petrogenesis of the Ophiolitic Giant Chromite Deposits of Kempirsai ...

Serpentine and talc-chlorite are abundant in all chromite types of the MOF, except vein-type amphibole-chromite rock, either as inclusions or as a matrix mineral surrounding chromite. Serpentine inclusions are chemically distinct from matrix serpentine in that they contain...

Chromite - Fine Minerals & Mineral Specimens on e-Rocks

Chromite. Type Locality. Bastide de la Carrade, Gassin, Var, Provence-Alpes-Côte d'Azur, France. Mineral Data. Fe2+Cr3+2O4. Strunz: 4.BB.05. Physical Properties. Colour: Black. Streak: Brown. Hardness: 5.5. Tenacity: brittle. Synonyms. Synonyms: Cromite. Photos...

Minerals Of Guyana - Guyana Geology and Mines Commission

Chromite Occurrence in Guyana. Muscovite is the most common mica. It is founded in granites, pegmatites, gneisses, and schists or as a secondary mineral resulting from the alteration of topaz, feldspar ... Cassiterite(Sn) forms in high-temperature veins and usually related to igneous rocks such as granites and rhyolites.

Metallic Deposits - Cliffs Notes

Metals occur in all kinds of rocks but usually in concentrations that are too low to be mined. Metallic ore deposits, however, are relatively rare concentrations of metal‐bearing minerals (usually sulfides) that contain enough metal to be profitably mined. Again, the profit line is dependent on a number of economic factors.

Chromite - NSW Resources and Energy

http://www.dpi.nsw.gov.au/minerals/geological/industrial-mineral-opportunities ... type in the state is near Bingara, associated with a large ... Chromite, the only commercial ore mineral of chromium, is only found in primary form in ultramafic rocks such as peridotite, dunite, pyroxenite, and in altered derivatives such.

Rocks and Minerals - Encyclopedia of Arkansas

Oct 24, 2016 ... Few rock layers are pure, so many mixtures and combinations of these types will be found, such as shaly limestones or dolomitic sandstones. .... several other high-pressure minerals have been noted to be associated with the lamproite intrusion, such as olivine ((Mg,Fe)2(SiO4)), chromite (Fe2Cr2O4),...

Lunar mineralogy

Main lunar minerals. Introduction. One of the major problems encountered by mineralogists studying lunar mineralogy is due to the scarcity of lunar materials ... New minerals like tranquilityite or armalcolite were found initially in moon rocks, but since their discovering, those mineral species have also been found on Earth.

Region 2: Appalachian/Piedmont - Teacher Friendly Guides

The Ultramafic Belt that extends the length of the Appalachian/Piedmont region from Vermont to Maryland contains a variety of minerals unique to the serpentinite rock found in the belt (Figure 6.11). The serpentinite rock itself is unusual, produced from the alteration of peridotites by metamorphism. The peridotite, derived...

DOGAMI Bulletin 93, Geology, mineral resources, and rock material ...

Geology of Western C urry County, Oregon , " contains a geologic map; an inventory of mineral resources; a brief review ..... The predominant rock type is a silver-gray, fine-grained schist or phyllite with abundant quartz veins. ... Mineral-resource potential: Ultramafic rocks are a source of chromite, nickel, some copper, asbes.

Layers of chromite - American Museum of Natural History

Chromite is usually one of the first minerals to crystallize in basaltic magma, and is thus commonly found as a layer near the bottom of magma chambers. In this sample, the black, once-flat chromite layer deformed, probably while the rock was still partially molten. Provided by Stillwater Mining Company, Nye, Montana.

Petrogenesis of the Ophiolitic Giant Chromite Deposits of Kempirsai ...

Serpentine and talc-chlorite are abundant in all chromite types of the MOF, except vein-type amphibole-chromite rock, either as inclusions or as a matrix mineral surrounding chromite. Serpentine inclusions are chemically distinct from matrix serpentine in that they contain...

Chromite - Alex Strekeisen

chromite series: Chromite: Fe2+Cr2O4. Magnesiochromite: MgCr2O4 magnetite series: Magnetite: Fe2+Fe23+O4. Magnesioferrite: MgFe23+O4. Franklinite: ZnFe23+O4. Jacobsite: ... Magnetite is one of the most ubiquitous of all minerals, appears in a vast variety of igneous rocks, metamorphic and sedimentary. All plutonic...

Chromite and chrome spinel occurrences from ... - RRuff

spinel and related spinel species are restricted almost exclusively to marie and ultramafic suites. A review of the chromite literature also indicates that chromites are common in kimberlites and ultrabasic rocks such as peridotites and dunites. Except for the reported occurrences of chrome minerals, including chromite, from...

Category:Minerals | Wookieepedia | FANDOM powered by Wikia

This category is for minerals of the galaxy, crystalline solids with an ordered arrangement of...

Minerals With Magnetic Properties & Types Of Magnetism

Minerals With Magnetic Properties & Types Magnetism Ferromagnetism Paramagnetism Diamagnetism When Heated Bismuth Repelled Field Magnet Weak Strong.

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