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Yarlongite

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Formula:
Cr4Fe4NiC4
Colour:
steel-grey
Lustre:
Metallic
Hardness:
5½ - 6
Specific Gravity:
7.19 (Calculated)
Crystal System:
Hexagonal
Name:
The name is for the first two syllables of the name of the Yarlong Zangbo River, which is near the Luobusha ophiolite (also known as the Brahmaputra River).
A supposed nitrogen-bearing variety is known from inclusions of some Brasilian diamonds.


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Classification of YarlongiteHide

Approved
Approval Year:
2007
1.BA.30

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
B : Metallic Carbides, Silicides, Nitrides and Phosphides
A : Carbides
1.1.25.3

1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group

Physical Properties of YarlongiteHide

Metallic
Transparency:
Opaque
Colour:
steel-grey
Streak:
Black
Hardness:
5½ - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Fracture:
Conchoidal
Density:
7.19 g/cm3 (Calculated)

Optical Data of YarlongiteHide

Type:
Anisotropic
Anisotropism:
medium
Colour in reflected light:
greyish white
Internal Reflections:
none
Pleochroism:
Non-pleochroic

Chemical Properties of YarlongiteHide

Formula:
Cr4Fe4NiC4
IMA Formula:
(Cr4Fe4Ni)C4

Crystallography of YarlongiteHide

Crystal System:
Hexagonal
Class (H-M):
6mm - Dihexagonal Pyramidal
Space Group:
P63mc
Cell Parameters:
a = 18.839(2) Å, c = 4.4960(9) Å
Ratio:
a:c = 1 : 0.239
Unit Cell V:
1,381.89 ų (Calculated from Unit Cell)
Z:
6

Type Occurrence of YarlongiteHide

General Appearance of Type Material:
irregular grains, with a size between 0.02 and 0.06 mm
Place of Conservation of Type Material:
Geological Museum of Cbina (No. M11650).
Geological Setting of Type Material:
podiform chromitites of the Luobusha ophiolite
Associated Minerals at Type Locality:

Synonyms of YarlongiteHide

Related Minerals - Nickel-Strunz GroupingHide

1.BA.05CoheniteFe3COrth.
1.BA.10Haxonite(Fe,Ni)23C6Iso. m3m (4/m 3 2/m) : Fm3m
1.BA.10Isovite(Cr,Fe)23C6Iso. m3m (4/m 3 2/m) : Fm3m
1.BA.15TongbaiteCr3C2Orth.
1.BA.20Khamrabaevite(Ti,V,Fe)C
1.BA.20Niobocarbide(Nb,Ta)CIso. m3m (4/m 3 2/m) : Fm3m
1.BA.20TantalcarbideTaCIso. m3m (4/m 3 2/m) : Fm3m
1.BA.25QusongiteWCHex. 6 m2 : P6m2

Fluorescence of YarlongiteHide

Other InformationHide

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

References for YarlongiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Shi Nicheng, Ma Zhesheng, Xiong Ming, Dai Mingquan, Bai Wenji, Fang Qingsong, Yan Binggang, and Yang Jingsui (2005): The crystal structure of (Fe4Cr4Ni)9C4. Science in China, Series D (Earth Sciences), 48(3), 338-345.
Shi N, Bai W, Li G, Xiong M, Fang Q, Yang J, Ma Z, Rong H (2008) Yarlongite: A new metallic carbide mineral. Acta Geologica Sinica 83, 52-56
Acta Geologica Sinica, 83(1), 52-56 (2009)
Kaminsky, F. V., Wirth, R., Schreiber, A. (2015): A microinclusion of lower-mantle rock and other minerals and nitrogen lower-mantle inclusions in a diamond. Canadian Mineralogist: 53(1): 83-104

Internet Links for YarlongiteHide

Localities for YarlongiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Brazil
 
  • Mato Grosso
    • Juína
      • Sorriso river
Kaminsky, F.V., Wirth, R., Schreiber, A. (2015): A microinclusion of lower-mantle rock and other minerals and nitrogen lower-mantle inclusions in a diamond. Canadian Mineralogist: 53(1): 83-104
China (TL)
 
  • Tibet Autonomous Region
    • Shannan Prefecture (Lhokha Prefecture; Lhoka Prefecture)
      • Qusum Co. (Qusong Co.)
Shi Nicheng, Ma Zhesheng, Xiong Ming, Dai Mingquan, Bai Wenji, Fang Qingsong, Yan Binggang, and Yang Jingsui (2005): Science in China, Series D (Earth Sciences), 48(3), 338-345.
          • Luobusha Mine ("Luobusa" Mine)
Li, G., Fang, Q., Shi, N., Bai, W., Yang, J., Xiong, M., Ma, Z., Rogn, He (2009) Zangboite (TiFeSi2), a new mineral from Luobusha, Tibet, China. Canadian Mineralogist, 47, 1265-1274.
Mineral and/or Locality  
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