Magnesiochromite R060797



Name: Magnesiochromite
RRUFF ID: R060797
Ideal Chemistry: MgCr2O4
Locality: Benbow mine, Stillwater Complex, Mount Wood area, Stillwater County, Montana, USA
Source: California Institute of Technology 11227 [view label]
Owner: RRUFF
Description: Black granular massive
Status: The identification of this mineral has been confirmed by X-ray diffraction and chemical analysis
Mineral Group: [ Spinel (62) ]
Quick search: [ All Magnesiochromite samples (3) ]
CHEMISTRY 
RRUFF ID: R060797.2
Sample Description: Microprobe Fragment
Measured Chemistry: (Mg0.55Fe2+0.45)Σ=1(Cr1.28Al0.58Fe3+0.14)Σ=2O4
Microprobe Data File: [ Download Excel File ]
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Sample is oriented and mounted on a pin.
Pin ID: M01281
Orientation: Laser parallel to  -a*  (-1 0 0).     Fiducial mark perpendicular to laser is parallel to  c   [0 0 1].
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BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R060797
Wavelength:
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
POWDER DIFFRACTION 
RRUFF ID: R060797.1
Sample Description: Powder
Cell Refinement Output: a: 8.2940(3)Å    b: 8.2940(3)Å    c: 8.2940(3)Å
alpha: 90°    beta: 90°    gamma: 90°   Volume: 570.54(6)Å3    Crystal System: cubic
  File Type Information Close
Calculated diffraction file.

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Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

  File Type Information Close
Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

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REFERENCES for Magnesiochromite

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. [view file]

Websky M (1873) Ueber Grochauit und Magnochromit, Zeitschrift der Deutschen Geologischen Gesellschaft, 25, 394-398   [view file]

Spencer L J (1913) A (sixth) list of new mineral names, Mineralogical Magazine, 16, 352-378   [view file]

Verwey E J W, Heilmann E L (1947) Physical properties and cation arrangement of oxides with spinel structures, Journal of Chemical Physics, 15, 174-180

O'Neill H S C, Dollase W A (1994) Crystal structures and cation distributions in simple spinels from Powder XRD structural refinements: MgCr2O4, ZnCr2O4, Fe3O4 and the temperature dependence of the cation distribution in ZnAl2O4, Physics and Chemistry of Minerals, 20, 541-555   [view file]

Roeder P L (1994) Chromite: from the fiery rain of chondrules to the Kilauea Iki Lava Lake, The Canadian Mineralogist, 32, 729-746   [view file]

Klemme S, O'Neill H St C (1997) The reaction MgCr2O4 + SiO2 = Cr2O3 + MgSiO3 of formation of magnesiochromite (MgCr2O4), Contributions to Mineralogy and Petrology, 130, 59-65

Lenaz D, Prinicivalle F (2005) The crystal chemistry of detrital chromian spinel from the southeastern Alps and outer Dinarides: The discrimination of supplies from areas of similar tectonic setting?, The Canadian Mineralogist, 43, 1305-1314   [view file]

Nestola F, Periotto B, Andreozzi G B, Bruschini E, Bosi F (2014) Pressure-volume equation of state for chromite and magnesiochromite: A single-crystal X-ray diffraction investigation, American Mineralogist, 99, 1248-1253

Ishii T, Kojitani H, Fujino K, Yusa H, Mori D, Inaguma Y, Matsushita Y, Yamaura K, Akaogi M (2015) High-pressure high-temperature transitions in MgCr2O4 and crystal structures of new Mg2Cr2O5 and post-spinel MgCr2O4 phases with implications for ultrahigh-pressure chromitites in ophiolites, American Mineralogist, 100, 59-65

Bosi F, Biagioni C, Pasero M (2019) Nomenclature and classification of the spinel supergroup, European Journal of Mineralogy, 31, 183-192