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IMA2007-034

Formula:
WC
System:HexagonalColour:Black, steel grey


Natural Tungsten Carbide.

Classification of IMA2007-034

IMA status:Approved 2007
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Type Occurrence of IMA2007-034

Type Locality:Luobusa Cr deposit, Qusum (Qusong) Co., Shannan Prefecture, Tibet Autonomous Region, China
Year of Discovery:1986
Geological Setting of type material:Chromite deposit, hosted in mafic-ultramafic rocks.

Occurrences of IMA2007-034

Geological Setting:In kimberlite; in a PGE-bearing Cu-Ni sulphide deposit hosted by mafic-ultramafic rocks.

Physical Properties of IMA2007-034

Diaphaneity (Transparency):Opaque
Colour:Black, steel grey
Fracture:Conchoidal

Crystallography of IMA2007-034

Crystal System:Hexagonal
Class (H-M):6 m2 - Ditrigonal Dipyramidal
Space Group:P6m2
Cell Parameters:a = 2.902Å, c = 2.831Å
Ratio:a:c = 1 : 0.976
Unit Cell Volume:V 20.65 ų (Calculated from Unit Cell)
Z:1

Optical Data of IMA2007-034

Type:Anisotropic
Anisotropism:Isotropic to weakly anisotropic
Bireflectance:No bireflectance observed
Reflectivity:
400nmR=66.46%
420nmR=64.42%
440nmR=55.13%
480nmR=53.14%
500nmR=50.73%
520nmR=48.56%
540nmR=46.66%
546nmR=46.09%
560nmR=45.39%
580nmR=45.02%
589nmR=44.94%
600nmR=44.5l%
620nmR=43.88%
640nmR=43.32%
660nmR=41.64%
680nmR=40.75%
700nmR=40.60%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 66.46%.
Colour in reflected light:White to yellowish white
Internal Reflections:None

Chemical Properties of IMA2007-034

Formula:
WC
All elements listed in formula:C, W
Analyical Data:Results from electron microprobe analyses of material from Sichuan (1, mean out of 3 analyses) and Shandong (2, range of results of 10 analyses); presence of carbon and absence of other elements with mass fractions above 1 wt.-% confirmed by Auger spectroscopy.
     (1)         (2)

W  (91.13)  (88.05-89.58)

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for IMA2007-034

Reference List:Strukturberichte (1926), 575.

Acta Crystallographica (1961) 14, 200.

Jianhong Zhang, Guojie Yang, and Zhaohui Li (1986): Discovery of natural tungsten carbide (WC) in China. Kuangwu Xuebao 6, 344-349 (in Chinese with English abstract). - American Mineralogist (1989) 74, 948 (abstract).

Doklady Akademy Nauk SSSR (1997) 352, 226-229.

American Mineralogist (1999) 84, 1468.

Articles/Blogs about IMA2007-034

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    Localities for IMA2007-034

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    China
     
    • Shandong Province
      • Linyi Prefecture
        • Yimeng Mts (Yimeng Shan)
          • Mengyin Co.
    Jianhong Zhang, Guojie Yang, and Zhaohui Li (1986): Kuangwu Xuebao 6, 344-349.
    • Sichuan Province
      • Garzê (Ganzi) Autonomous Prefecture
        • Danba Co.
          • Yangliuping dome
    Jianhong Zhang, Guojie Yang, and Zhaohui Li (1986): Kuangwu Xuebao 6, 344-349.
    • Tibet Autonomous Region
      • Shannan Prefecture
        • Qusum (Qusong) Co.
    IMA website
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