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  • Sand Minerals - Sandatlas

    Garnet. Garnet have isometric crystal structure which means that they are very rarely elongated. Garnets are formed in both metamorphic (schist, amphibolite, eclogite) and igneous (some granites, peridotite) rocks. When sand contains abundant garnet, it usually contains epidote and magnetite as well.

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  • Stratiform Chromite Deposit Model - USGS

    Chromium is the primary commodity associated with stratiform chromite deposits. The economic potential of chromite deposits depends mainly on the thickness, continuity, and grade of ore. The most important uses of chromium are in stainless steels, nonferrous alloys, and chromium plating.

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  • Chromite | Mineralogy4Kids

    Chromite. The only ore of chromium, chromite is a major constituent in stainless steel. It is one of the first minerals to separate from a cooling magma, and large chromite deposits are thought to have been derived by such magmatic differentiation.

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  • The crystal structure of chromian kassite from the ...

    The crystal structure of kassite, ideally Ca[Ti 2 O 4 (OH) 2], containing 2 wt% Cr 2 O 3, from the Saranovskoye chromite deposit, Perm'' district, Northern Urals, has been determined and refined to R1 = 0.06 using single crystal X-ray diffraction data. The crystals have monoclinic symmetry, P2 1

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  • The first new mineral with post-spinel structure is ...

    The first new mineral with post-spinel structure is approved by CNMNC of IMA 12 September 2008 Xiete is the first new mineral with post-spinel structure found by a Chinese-American team from

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  • Mild Hydrothermal Crystallization of Heavy Rare-Earth ...

    Mild Hydrothermal Crystallization of Heavy Rare-Earth Chromite RECrO 3 (RE = Er, Tm, Yb, Lu) Perovskites and Magnetic Properties. ... The crystal structure and stability of a giant tetragonal phase in electron-doped Pb 1−x Bi x VO 3 and hole-doped Pb 1−x Na x VO 3 were studied. Electron doping effectively destabilized the tetragonal structure.

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  • Chromite - WikiVisually

    The only ores of chromium are the minerals chromite and magnesiochromite. Most of the time, economic geology names chromite the whole chromite-magnesiochromite series: FeCr 2 O 4, (Fe,Mg)Cr 2 O 4, (Mg,Fe)Cr 2 O 4 and MgCr 2 O 4. The two main products of chromite refining are ferrochromium and metallic chromium; for those products the ore smelter process differs considerably.

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  • Phyllosilicates - Tulane University

    The trioctahedral phyllosilicates are based on the structure where the octahedral layers are similar to brucite, where Mg+2 occupies the cation position. The dioctahedral phyllosilicates are based on the structure where the octahedral layers are similar to gibbsite, where Al+3 occupies the cation position.

    The first new mineral with post-spinel structure is ...

    Spinel structure is one of the most important types of structures of minerals in Earth''s mantle. This study presents the first natural occurrence of post- spinel mineral "xieite", which occurs in the Suizhou meteorite which underwent a strong collision in space.

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  • TiO2 Structures

    The TiO2 group is composed of rutile, anatase, and brookite. The crystal structure of rutile. The crystal structure of anatase. The crystal structure of brookite.

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  • High-pressure phase transitions in FeCr2O4and structure ...

    At 12-16 GPa, FeCr 2 O 4 spinel (chromite) first dissociates into two phases: a new Fe 2 Cr 2 O 5 phase + Cr 2 O 3 with the corundum structure. At 17-18 GPa, the two phases combine into CaFe 2 O 4-type and CaTi 2 O 4-type FeCr 2 O 4 below and above 1300 °C, respectively.

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  • WebElements Periodic Table » Cadmium » crystal structures

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

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  • Chemical Elements - Chromium (Cr)

    Facts Date of Discovery: 1797 Discoverer: Louis Vauquelin Name Origin: From the Greek word chrôma (color) Uses: Stainless steel Obtained From: Chromite Related Links None available. MLA Format for Citing This Page Bentor, Yinon. Chemical Element - Chromium.

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  • First crystal-structure determination of chromites from an ...

    We report the first crystal-structure determinations of chromites from an acapulcoite and from ordinary chondrites. Cell edges range from 8.3212 (3) to 8.3501 (1) angstrom, while the oxygen positional parameters are in the range 0.2624 (3) to 0.26298 (9). Their compositions show they are very close to the chromite end-member FeCr2O4 with limited Al and Mg content.

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  • Preparation of Trigonal and Hexagonal Cuprous Chromite and ...

    Abstract Single crystals of trigonal 3R-CuCrO 2 were grown by a flux decomposition method. A new metastable hexagonal phase of 2H-CuCrO 2 was prepared by quenching the trigonal crystals from 1100°C to room temperature. A model of the atom shifts occurring during the 3R-2H structural phase transition is presented.

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  • The influence of the Jahn–Teller effect ... - SpringerLink

    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 8.3832 (5) to 8.2398 (11) å up to 11.8 GPa.

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  • CHAPTER 3: LITERATURE REVIEW - WIReDSpace Home

    According to McLaren and De Villiers [21] the UG2 Reef consists primarily of. chromite (60 -90% by volume), orthopyroxene (5-25%) and plagioclase (5-15%). Secondary or accessory minerals also form part of the UG2 Reef and are listed in. Table 3.1.

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  • The crystal structures of synthetic Re‐ and PGE‐bearing ...

    Electron microprobe analysis and single crystal X‐ray diffraction techniques were employed to determine the composition, crystal structures and site occupancies, indicating that the magnesioferrite structure can accommodate wt% levels of Re and the platinum group elements (PGE) at oxidized conditions.

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  • Natural occurrence and synthesis of two new postspinel ...

    high-pressure polymorphs of chromite, we performed a series of synthesis experiments at pressures from 7.5 to 25 GPa and at a temperature of 2,000°C, using laser-heated diamond anvil cells. A natural crystal of chromite with a similar chemical composi-tion as the chromite .

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  • Structure and Radiation Damage A new model for the ...

    Structure and Radiation Damage in Y 2 Ti 2 O 7 and Y 2 TiO 5 ... form, a crystal structure which has been extensively studied as an immobilization matrix for nuclear waste. YTi-O - ... In contrast, residual chromite grains in the host peridotites and dunites show a wide range of composition.

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  • MIKE''S PUBLICATIONS – Mike Boucher''s Web Page

    The Crystal Structure of Alamosite, PbSiO3 – Masters Thesis Textbook on Microscopy of ores for Mineral Processing Engineers- personal project Study of accelerators for reduction of Chromite to Ferrochrome- will never be published.

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  • First crystal-structure determination of chromites from an ...

    We report the first crystal-structure determinations of chromites from an acapulcoite and from ordinary chondrites. Cell edges range from 8.3212 (3) to 8.3501 (1) angstrom, while the oxygen positional parameters are in the range 0.2624 (3) to 0.26298 (9). Their compositions show they are very close to the chromite end-member FeCr2O4 with limited Al and Mg content.

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  • Cubic Crystals Gemstones and Minerals | Gem5

    Cubic Crystals Gemstones & Minerals. Zircon: Zircon is a zirconium silicate with a tetragonal crystal system, and also contains thorium and uranium. It appears as stubby, prismatic, isolated or sometimes dipyramidal, like two pyramids connected at their bases; or in .

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  • Copper chromite - Revolvy

    Apr 22, 2017· Copper chromite is produced through the exposure of copper ammonium chromate to temperatures of 350-450 °C: An active copper chromite catalyst which includes barium in its structure can be prepared from a solution containing barium nitrate, copper(II) nitrate, and ammonium chromate. When these compounds are mixed a resulting precipitate is formed.

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  • Single crystal growth, structure refinement, ferroelastic ...

    Crystal cuts have been examined by means of polarized light microscopy in reflection, revealing ferroelastic domain structures consistent with the tetragonal symmetry. The phase transitions in the copper chromite have been studied both by in situ optical .

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

    The crystal structure of chromite FeCr 2 O 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) Å to 8.2398 (11) Å up to 11.8 GPa. A fit to the Birch .

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  • University of Minnesota''s Mineral Pages: Biotite

    Dark colored minerals with a layered crystal structure, biotite and phlogopite both display a single perfect cleavage direction. This cleavage allows biotite and phlogopite samples to be easily separated into thin flexible light-transmitting translucent sheets.

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  • Crystal structure refinement of Co-doped lanthanum ...

    Mar 01, 2012· Results of crystal structure refinements and phase quantification for samples of Co-doped lanthanum chromites with nominal composition LaCr 1−x Co x O 3, for x=0.00, 0.10, 0.20, and 0.30, prepared by combustion synthesis are presented.The resulting powders were characterized by scanning electron microscopy and X-ray diffraction (XRD).

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  • Mineral Mine

    Jan 05, 2019· The key items that make something a mineral are occurring naturally, and the definite crystal structure, that is expressible as a chemical formula. Rocks that do not meet this criteria are referred to as amorphis - not having a definite structure or expressible as a chemical formula.

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  • Chemical composition and crystal structure of merrillite ...

    The systematic absences of reflections suggest possible space group R3c or R3c. The crystal structure was solved and refined using SHELX97 (Sheldrick 2008) based on space group R3c, because it produced the better refinement statistics in terms of bond lengths and angles, atomic displacement parameters, and R factors.

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  • Chemical Elements - Chromium (Cr)

    Facts Date of Discovery: 1797 Discoverer: Louis Vauquelin Name Origin: From the Greek word chrôma (color) Uses: Stainless steel Obtained From: Chromite Related Links None available. MLA Format for Citing This Page Bentor, Yinon. Chemical Element - Chromium.

    Chemical Database: Chromite (mineral ...

    Editor''s note: Some chemicals in this database contain more information than others due to the original reason this information was collected and how the compilation was accomplished. While working with material safety data sheets (MSDS), I found that manufacturers sometimes used obscure names for constituent chemicals and I didn''t always have a good idea of what I was dealing with.

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