Chromite (Cr) occurs exclusively in mafic and ultramafic igneous rocks (Papp and Lipin, 2006).Although some Cr-based minerals such as crocoite (PbCrO 4), vauquelinite (Pb 2 Cu[CrO 4][PO 4]), uvarovite (Ca 3 Cr 2 [SiO 4] 3), and merumite (4(Cr,Al) 2 O 3 ·3H 2 O) are well known, chromite (FeCr 2 O 4) is the only one that is a commercially recoverable source of Cr (Sueker, 2006; Glastonbury et ...
Chromites from two horizons of the Sukinda area (India) marked as 'grey ore' and 'brown ore' zones have been studied by 57Fe M6ss spectroscopy, which revealed that both chromite types are ...
The report scope includes the Chromites chain market into various types, application followed by key market players engaged in the manufacturing of the Chromites across the world. The report provided with various drivers, restraint, opportunities and challenges. The report also provides various marketing models such as value chain, porter five ...
Peridotite and gabbro form an intrusive complex which is exposed over an area about 35 km wide and 150 km long in the center of the Zambales Range of western Luzon. The Zambales Complex is remarkable for its total known resources, mined and still remaining, of about 15 million metric tons of chromite ore. Twenty percent of Free World production was obtained from this area between 1950 …
The large chromites however are mildly normally-zoned, but contain between 2.3 to 1.7 wt% Al 2 O 3 from core to rim, about 0.65 wt% V 2 O 5, and have very dif-ferent core [FFM=~59] to rim [FFM= ~63] composi-tions (Fig. 2). There are virtually no Fe/Mn variations from core to rim on the large chromites, with a range of 34-37. Figure 1.
Inferred temperature conditions suggest that the zoned chromites, homogeneous chromites, and their hosts are equilibrated at different metamorphic conditions. In this paper, various mechanisms during the cumulus to subsolidus stages are explored in order to understand the …
Inferred temperature conditions suggest that the zoned chromites, homogeneous chromites, and their hosts are equilibrated at different metamorphic conditions. In this paper, various mechanisms during the cumulus to subsolidus stages are explored in order to understand the …
of zoned chromites ranges from 0.4 to 0.85 in the Mt. Higashi-Akaishi peridotite body. However, the zoning is absent in fine grained chromites. The cores of the fine grained chromites have lower Al2O3 content than those of coarse-grained chromites in the same specimen but Ycr is constant regard-
Chromites were General Havoc's elite robotic foot soldiers. According to him they feel no pain, and with no need to breathe are excellent fighters both on land and underwater, wielding staff like weapons that could fire blasts of energy. They come in pink, blue, white and green bodies and are seen piloting the Turbo Megazord while it's under Divatox' control, and other vehicles. A special ...
The only ore of chromium. Chromium is used with various other metals to give hardness to steel, also as a plating material because of its non-corrosive nature. Chromite bricks are used to a considerable extent as linings for metallurgical furnaces, because of their neutral and refractory character.
In thin section two types of chromites have been recognized: (i) Showing euhedral and anhedral forms, dark brown (translucent) color traversed by numerous irregular veins of colorless serpentine. The chromite grains usually contain inclusions of colorless serpentine or …
The principal zone of isomorphism for the chromites in the triangular prism of composition ranges from compositions approaching magnesiochromite and spinel to magnetite, leading to the division of chromites into the following types, with the replaceable ions written in order of abundance: alumini.n chromite (Mg, Fe)O·(Cr, ...
Chromite is a crystalline mineral composed primarily of iron(II) oxide and chromium(III) oxide compounds. It can be represented by the chemical formula of FeCr 2 O 4.It is an oxide mineral belonging to the spinel group.The element magnesium can substitute for iron in variable amounts as it forms a solid solution with magnesiochromite (MgCr 2 O 4). A substitution of the element aluminium can ...
General Chromite Information : Chemical Formula: Fe++Cr2O4 : Composition: Molecular Weight = 223.84 gm Chromium 46.46 % Cr 67.90 % Cr 2 O 3: Iron 24.95 % Fe 32.10 % FeO: Oxygen 28.59 % O: 100.00 % 100.00 % = TOTAL OXIDE
pentine produce orbicularores, and, in the chromites of both layered and podiform types, concentric compositional zoning may be developed, with outerzones exhibitingrelative enrichmentin iron (often observableunderthe microscope as a lighter peripheral zone).Such textures are often the result of hydrothermal alteration during serpentinization.
Chromite definition, a salt of chromium in the bivalent state. See more.
Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4 ). It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity. 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 or ...
Meet the Team. Our nine staff, known affectionately as "Chromites", have worked together. an average of 18 years, not even counting founder Mike's 41 years. They share over 150 years of imaging experience, working in harmony to produce superior scans and prints... consistently. They've all seen a thing or two and are willing and pleased.
Two types of fine-grained chromite, F1 and F2, are present. While F1 exhibits a well- developed polygonal texture, straight grain boundaries and low intercrystal misorientation (b 1°), F2 shows low-angle boundaries and significant intercrystalline misorientation (2–8°).
New results published in Ore Geology Reviews show that chromites from different types of mafic-ultramafic intrusion of the East African Kibaran igneous belt preserve the record of their ...
concentrate is then sent to one of three types of beneficiation plants for processing. Chromite ore-processing facilities commonly are near or at the mine sites although some plants are fed by several mines. Although there has been extensive study of the large, layered mafic-ultramafic intrusions in …
The rocks associated with podiform chromites are generally referred to as "Alpine-type" peridotites and they are usually found along major fault zones within mountain belts. 2. Ni-Cu+/-Co Deposits Ni-Cu Deposits are the end of a magmatic process known as "liquid immiscibility''.
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): SUMMARY. Transmission electron microscopy of several chondritic meteorites reveals exsolution products of two kinds in olivine. The coarser variety comprises particles that have nucleated heterogeneously on subgrain boundaries. Electron microprobe data confirm that these are chromite.
According to the first principles,the lattice structure,elasticity and electronic properties of three kinds of chromites spinel subject to slight structural variation are studied by the pseudowaves plane(PWP) approach based on density functional theory(DFT) and generalized gradient approximation(GGA).
These two reef types were also found to be identical in the composition of the chromites present. In addition, in both of these almost unaltered reef types it was found that chromite showed small recoveries by …
Two kinds of exsolution in chondritic olivine - Volume 43 Issue 328. ... The aluminium-poor compositions of heterogeneously exsolved chromites suggest that some Cr may have entered tetrahedral sites in olivine during initial rapid crystallization from the melt. Type Research Article.
During the ascent to the Earth's surface kimberlite magmas entrain mantle minerals - chromites, ilmenites, garnets and the most desirable - diamonds. Kimberlite magma partially dissolves these minerals during the ascent, producing different types of surface features on the minerals. Experiments showed that surface features on diamonds can be used to constrain composition of magmatic fluid.
On the Cr-Fe +3-Al ternary discrimination diagram of Stevens homogeneous chromites and cores of zoned chromites show composition similar to that of aluminium-type chromites, whereas the altered rims plot in the field of Cr-magnetite (Figure 5a). On the other hand, the compositional data of homogeneous chromites of Barramiya show that, they have ...
Fe3+/Fe2+ ratios were determined for a suite of chromite samples from the Bushveld Complex, South Africa, using57Fe Möss spectroscopy and a ceric sulphate titration method. Two distinctly different types of chromite were identified. Type I chromites have low Fe3+/Fe2+ ratios (between 0.2 and 0.4), and contain 3 cations for every 4 oxygen ions in the chemical formula unit. Type II ...
Abstract— Reflectance spectra of spinels and chromites have been studied as a function of composition. These two groups of minerals are spectrally distinct, which relates largely to differences in the types of major cations present. Both exhibit a number of absorption features in the 0.3–26 μm region that show systematic variations with composition and can be used to quantify or constrain ...
