chromite crystal structure


dolomite | Formation, Structure, Properties, Uses, & Facts ...

Crystal structure. In a somewhat simplified way, the dolomite structure can be described as resembling the calcite structure but with magnesium ions substituted for calcium ions in every other cation layer. ... Thus, the dolomite structure can be viewed as ideally comprising a calcium layer, a CO 3 layer, ... Magnetite and chromite are the ...

Porous MgTi2O5/MgTiO3 composites with narrow pore-size ...

Porous MgTi2O5/MgTiO3 composites with narrow pore-size distribution:in situprocessing and pore structure analysis Yoshikazu SUZUKI³ and Masafumi MORIMOTO* Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611–0011

Chromite: The only mineral ore of chromium metal

Chromite is the only ore of chromium, a metal essential for making stainless steel, nichrome, chrome plating, pigments, refractories, chemicals and pharmaceuticals.

Spinel | mineral | Britannica.com

The members of the spinel series often substitute for one another in the crystal structure, so that most specimens are mixtures. For general information on the use and occurrence of the chromium- and iron-spinel series, see chromite; magnetite.

Spinel Structures

The crystal structure of spinel. Spinel Hercynite Mg-ferrite Mg-chromite Magnetite Jacobsite Chromite Ulvospinel MgAl 2 O 4 FeAl 2 O 4 MgFe 2 O 4 MgCr …

Pressure-induced distortive phase transition in chromite ...

The crystal structure of chromite FeCr2O4 was investigated to 13.7 GPa and ambient temperature with single-crystal X-ray diffraction techniques. The unit-cell parameter decreases continuously from ...

Spin glass behavior in a single crystal of chromite

Spin glass behavior in a single crystal of chromite KnvrN Srvnru.Ncn, RoNll-o Eocn ... Columbia, South Carolina 29208, U.S.A. Ansrnrcr Elastic neutron scattering experiments on a single crystal of chromite (Feo.rMgour),or- ... Sixteen of the 32 interstices coordinated by chromite has a normal spinel structure. The substitution

CRYSTAL ORIENTATION EFFECTS FOR OXYGEN-ISOTOPE ...

CRYSTAL ORIENTATION EFFECTS FOR OXYGEN-ISOTOPE MEASUREMENTS OF CHROMITE. C. E. Caplan 1, G. R. Huss , J. E. Hammer2, ... The crystal structures of chromite and magnetite are both hexoctahedral, face-centered cubic, with very ... structures of magnetite and chromite are the same, we

The structure of and origin of nodular chromite from the ...

A, 3D image of a cage structure of chromite showing truncation of the cage that reveals the 2D skeletal form (black). Blades that make up this 2D skeletal crystal extend in 3D to form parallel plates that make up part of a cage structure. B–D, are 3D images from ND16.

Spinel group - Wikipedia

Crystal structure of spinel Normal spinel structures are usually cubic close-packed oxides with eight tetrahedral and four octahedral sites per formula unit. The tetrahedral spaces are smaller than the octahedral spaces.

Chromic oxide | CrO2 - PubChem

Examination of growth patterns of Cr2O3-induced mutants showed that, after a delay in reinitiating cell growth, they had varying growth kinetics. The results indicate the ability of a particulate (Cr(III) compound to induce mutation in a mammalian cell system and the usefulness of such systems for detecting genotoxic insoluble metal compounds.

Ilmenite | X Ray Crystallography | Crystallography

The Crystal Structure of Ilmenite. Received February 6th. From powder. Geophysical Laboratory. In accordance with the observed exter. Summary. and Weissenberg X-ray photographs of ilmenite its atomic arrangement. F. Posnjak. has been completely determined. which is a sub-group of the space group of corundum. Carnegie Institution January.

Chromium - Wikipedia

It is dehydrated by heating to form the green chromium(III) oxide (Cr 2 O 3), a stable oxide with a crystal structure identical to that of corundum. Chromium(VI) ... which is iron chromium oxide (FeCr 2 O 4); chromite is now the principal source of chromium for use in pigments.

Crystal structure refinement of Co-doped lanthanum chromites

Crystal structure refinement of Co-doped lanthanum chromites ... crystal structure data for the refinements of LaCrO ... June 2008 Crystal structure refinement of Co-doped lanthanum chromites S19. i.e., surfaces with the appearance of sponges. As a …

Chromite - Wikipedia

Chromite is an iron chromium oxide: FeCr 2 O 4. 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 (MgCr 2 O 4 ); [5] substitution of aluminium occurs leading to hercynite (FeAl 2 O 4 ).

Chromite R110059 - RRUFF Database: Raman, X-ray, Infrared ...

REFERENCES for Chromite; American Mineralogist Crystal Structure Database Record: [view record] Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America.

Magnesiochromite Mineral Data

Crystal Structure: Mouse drag1 - LMB Manipulate Structure drag2 - RMB Resize/Rotate Keyboard S - Stereo Pair on/off H - Help Screen I - Data Info A - Atoms On/Off P - Polyhedra On/Off B - …

The influence of the Jahn–Teller effect at Fe2+ on the ...

Abstract The crystal structure of chromite FeCr 2O 4 was investigated to 13.7 GPa and ambient temperature with single-crystal X-ray diffraction techniques. The unit-cell parameter decreases continuously from 8.3832 (5) to 8.2398 (11) A˚ up to 11.8 GPa. A fit to the Birch–Murnaghan equa-

TiO2 - Rutile: Interactive 3D Structure

Interactive 3D structures of a range of solid state inorganic compounds. ChemTube3D Home. A Level. Organic Reactions. Structure and Bonding. Polymers. Inorganic Chemistry. ... TiO 2 - Rutile. Synchronised View - Ti 6 (octahedra) : O 3 (trigonal planar) Distorted O with Ti in half of Oh holes .

CHEMISTRY AND MINERALOGY OF EARTH’S MANTLE High …

CHEMISTRY AND MINERALOGY OF EARTH’S MANTLE High-pressure high-temperature transitions in MgCr 2O 4 and crystal structures of new Mg 2Cr 2O 5 and post-spinel MgCr 2O 4 phases with implications for ultrahigh-pressure ... chromite into Fe 2Cr 2O 5 + Cr 2O

Chromite: Mineral information, data and localities.

Chromite is the most important chromium ore mineral. It forms a complete solid solution series with many other members of the group, eg. in the Chromite-Hercynite Series, Chromite-Spinel Series, Chromite-Magnetite Series and the Chromite-Magnesiochromite Series.It is the iron analogue of Zincochromite, Cochromite, Manganochromite and Magnesiochromite and the Cr analogue of …

A Model for Co-Precipitation of Platinum-Group Minerals ...

A Model for Co-Precipitation of Platinum-Group Minerals with Chromite from Silicate Melts James Mungall ... crystal structure of chromite but occur as discrete inclusions of Platinum-Group Minerals (PGM) ... chromite crystal is advected through a turbulent and …

Substitution effects on frustrated magnetism of chromite ...

Jan 05, 2019· The crystal structure of ZnCr 2 O 4 and CdCr 2 O 4, and the spin state of Cr 3+ in these compounds are respectively shown in Figs. 1(a) ... Crystal structure of chromite spinel ACr 2 O 4 (A = Zn and Cd). (b) Spin states of Cr 3+ (3d 3) and Fe 3+ (3d 5) in the octahedral crystal field. 2.

SPINEL STRUCTURE | EXPLANATION - adichemistry.com

E.g. MgAl 2 O 4 (known as spinel), Mn 3 O 4, ZnFe 2 O 4, FeCr 2 O 4 (chromite) etc. CRYSTAL STRUCTURE OF NORMAL SPINELS (AB 2 O 4) A spinel unit cell is made up of 8 FCC cells. The anions (usually oxide ions: O 2-) occupy the FCC lattice points.

Chromite (compound) - Wikipedia

Crystal structure of spinel In chemistry the term chromite has been used in two contexts. Under IUPAC naming conventions, chromate(III) is preferred to chromite .

8.6: Spinel, perovskite, and rutile structures - Chemistry ...

Chromite spinels, M II Cr 2 O 4, ... The perovskite structure has simple cubic symmetry, but is related to the fcc lattice in the sense that the A site cations and the three O atoms comprise a fcc lattice. ... The mineral rutile is one of the polymorphs of TiO 2, the others (anatase and brookite) also being 6:3 structures. Figure: Rutile ...

Crystal and magnetic structure of copper chromite

crystal structure of copper chromite, CuCr204, is one which can be derived from the spinel structure by a compression along one of the cube axes, so the result- ing unit cell is tetragonal. They find that the cation distribution is normal, that is, the divalent copper ions

The Stillwater Complex: The response of chromite crystal ...

The Stillwater Complex: The response of chromite crystal chemistry to magma injection. ... Program for crystal structure . refinement. German y, Uni versity of Gott ingen, ...

Chromite Mineral Data

Links to other databases for Chromite : 1 - Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Athena 4 - EUROmin Project 5 - Ecole des Mines de Paris 6 - GeoScienceWorld 7 - Glendale Community College 8 - Google Images 9 - Google Scholar 10 - Handbook of Mineralogy (MinSocAm)

Chromite Crystal Structure and Chemistry applied as an ...

Chromite Crystal Structure and Chemistry Applied as an Exploration Tool (Thesis format: Integrated Article) by Patrick H.M. Shepherd Graduate Program in Earth Science A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science The School of Graduate and Postdoctoral Studies The University of Western Ontario

The structure of normal Spinels.

The structure of spinel. Normal Spinels. Spinel is the name given to the mineral MgAl 2 O 4. It has a common structural arrangement shared by many oxides of the transition metals with formula AB 2 O 4.

WO2017127788A1 - Modified black spinel pigments for glass ...

A copper chromite crystal structure is modified by addition of one or more elemental oxides. 2. Description of Related Art [0003] Pigments are widely used in various applications such as paints, inks, plastics, rubbers, ceramics, enamels, and glasses. There are various reasons for …

AMCSD Search Results - rruff.geo.arizona.edu

View JMOL 3-D Structure : Chromite: Lenaz D, Princivalle F: The Canadian Mineralogist 43 (2005) 1305-1314: The crystal chemistry of detrital chromian spinel from the: southeastern Alps and Outer Dinarides: The discrimination of: supplies from areas of similar tectonic setting? Sample: CL 1 _database_code_amcsd 0006033