"Chromite Crystal Structure and Chemistry applied as an ...

The spinel group minerals have long been of interest to the geosciences due to their use as indicator minerals. Unit cell is a structural measure controlled by composition but is also affected by pressure and temperature relations through order-disorder. This study attempted to look at the applications of unit cell in exploration. The implementation of µXRD for this purpose required the ...

Chromite: The mineral Chromite information and pictures

Chromite, the principle ore of the element chromium, is a commercially valuable mineral. However, due to mining restrictions and the fact that Chromite is not commonly found in crystallized form, it is not well-represented in mineral collections.

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.

Chromite - Wikipedia

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 Hercynite ...

Messengers from the deep: Fossil wadsleyite-chromite ...

Nov 13, 2015· The sample consists of two zones: Zone 1 contains larger chromite grains (591vm vs 526 μm) with slightly higher median aspect ratios (1.73 vs 1.70) and lower abundance of olivine (1.6 area% vs 2.2 area%) than zone 2 (Fig. 1e,f).The line separating these two zones is inferred to represent the trace of the foliation in this rock (Fig. 1d).Chromite subgrain and grain boundaries are commonly ...

Chromite | Earth Sciences Museum | University of Waterloo

The refractory industry uses chromite for forming bricks and shapes, as it has a high melting point, moderate thermal expansion, and stable crystalline structure; Tanning leather; References: Chromite mineral facts. Chromite mineral data. Chromite-mineral properties and uses. Minerals Zone. Republic of mining. Ontario's ring of fire mineral ...

Peridot gemstone information - gemdat.org

The name "Peridot" is believed to have originated from the Arabic word faridat, meaning "gem", or alternatively, as the Oxford English Dictionary suggests, it came from classical Latin pæderot - a kind of opal. The colour of peridot gems can vary from yellow- to olive- to brownish-green, depending on quantity of iron in the crystal structure.

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

Chlorite - NOVA Mineralogy

The name chlorite encompasses a variety of Mg-rich phyllosilicates which are difficult to tell apart without detailed chemical studies. The information below, then, may seem a bit scattered and/or vague. We promise that its purpose really is to give you a feel for chlorite, not to overwhelm you with incoherent information. Trust us: once you learn … Continue reading Chlorite →

Cochromite Mineral Data

Garcia Casado P, Rasines I, Polyhedron, 5 (1986) p.787-789, Preparation and crystal data of the spinel series Co1+2sCr2-3sSb3O4, Sample: s = 0.40, Co1.8Cr.8Sb.4O4 Physical Properties of Cochromite

Chromite - WikiMili, The Best Wikipedia Reader

Chromite is also common in iron meteorites and form in association with silicates and troilite minerals. [10] Crystal structure. The chemical composition of chromite is Fe 2+ Cr 3+ 2 O 4. [4] Chromite, when presented as an ore, or in massive form, forms as fine granular aggregates.

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

Dolomite, type of limestone, the carbonate fraction of which is dominated by the mineral dolomite, calcium magnesium carbonate. Along with calcite and aragonite, dolomite makes up approximately 2 percent of the Earth's crust. Learn more about the structure, properties, and uses of dolomite …

Chromite - an overview | ScienceDirect Topics

Fig. 11.1 shows crystal structures of chromite spinel (Sanchez-Segado et al., 2015). Large variations in the total and relative amounts of Cr and iron in the lattice occur depending on the different geological and geographical distribution of chromite deposits ( Rao et al., 2010 ).

Chromite (Cr2FeO4) | FeCr2O4 - PubChem

Chromite which contained higher levels of Cr(VI), was found to be mutagenic in Salmonella typhimurium. ECOTOXICITY STUDIES: Hexavalent chromium [Cr (VI)] is a constituent of chromite ore. Although it is known to have several industrial and technological applications, its release into the aquatic environment as a result of chemical spill or ...

Iron(II) chromite - Wikipedia

Preparation. It is created by the sintering of chromium(III) oxide and iron(II) oxide at 1600 °C. It also occurs in nature as the mineral chromite, though with many impurities.. Uses. It is used as a commercial source of chromium and its compounds. It is also used as a catalyst in the synthesis of hydrogen (H 2) from the reaction between carbon monoxide and water vapor.

Chromite: The only mineral ore of chromium metal

What is Chromite? 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 weathering.

Tetragonal low-temperature phase of MgCr2O4 | Powder ...

" Crystal-structures and cation distributions in simple spinels from powder XRD structural refinements—MgCr 2 O 4, ZnCr 2 O 4, Fe 3 O 4 and the temperature-dependence of the cation distribution in ZnAl 2 O 4," Phys. Chem. Miner.

Chromite definition and meaning | Collins English Dictionary

Chromite definition: a brownish-black mineral consisting of a ferrous chromic oxide in cubic crystalline form,... | Meaning, pronunciation, translations and examples

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 - …

Chromite Mineral Data

Other Chromite Information: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) See Also: 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

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 .

The structure and magnetism of orthochromites Ho1−xYxCrO3 ...

Mar 01, 2019· The crystal structure, dynamics, magnetic structure and property of orthochromites solid solution Ho 1−x Y x CrO 3 (x = 0, 0.2,…,1.0) were systematically investigated by X-ray diffraction, Raman scattering, magnetometry and neutron powder diffraction. With increasing non-magnetic Y 3+-substitution for Ho 3+ throughout the whole range, the crystallographic parameters remain almost …

AMCSD Search Results

View JMOL 3-D Structure : Chromite: Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F : European Journal of Mineralogy 19 (2007) 599-609: Crystal chemistry and structural refinement of chromites from different: chromitite layers and xenoliths of the Bushveld complex: Locality: Bushveld complex, South Africa: Sample: BV21A, LG

Columbite | mineral | Britannica

Columbite, hard, black (often iridescent), heavy oxide mineral of iron, manganese, and niobium, (Fe, Mn)Nb 2 O 6. Tantalum atoms replace niobium atoms in the crystal structure to form the mineral tantalite, which is similar but much more dense.These minerals are the most abundant and widespread of the naturally occurring niobates and tantalates and are important ores, their elements niobium ...

Chromite Mineral – Meaning, Formation, Mines, Properties ...

Chromite is the main source of the metal chromium that is composed of iron, chromium, and oxygen. These minerals are the member of the Spinel group and share the same crystal structure but differ in composition.. Chromite is isomorphous with Magnesiochromite and because of their occurrence in the same environment, they can be easily confused with each other.

Clinohumite and Chromite in Calcite Tumblestone | #168337883

Clinohumite and Chromite in Calcite Tumblestone This fantastic and very unusual tumblestone has two minerals held within Calcite, Clinohumite (the brown inclusions) - a rare silicate mineral with a hardness of 6 and a monoclinic crystal structure, and Chromite (the black inclusions) - an iron chromium oxide with a harness of 5.5 and an isometric crystal system.

WebElements Periodic Table » Chromium » crystal structures

This WebElements periodic table page contains crystal structures for the element chromium

Fe2+ -Fe3+ ordering in chromite and Cr-bearing spinels ...

Möss spectra for a variety of analysed spinel phases, representing a very wide range in both total iron content and Fe 3+ /(Fe 2+ +Fe 3+) ratio, indicate an essentially ordered arrangement of iron atoms in the crystal structures of natural chromite and Cr-bearing spinels.All of the Möss spectra have been rationalised by fitting just two doublets, assigned to Fe 2+ in the ...