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Anduoite

A valid IMA mineral species
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Formula:
(Ru,Os)As2
Colour:
lead gray
Lustre:
Metallic
Hardness:
6½ - 7
Specific Gravity:
8.692 (Calculated)
Crystal System:
Orthorhombic
Name:
For the type locality
Anduoite-Omeiite Series.


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Unique IdentifiersHide

Mindat ID:
227
Long-form identifier:
mindat:1:1:227:1

IMA Classification of AnduoiteHide

IMA status:
Approved
IMA status notes:
Published without approval
IMA Formula:
RuAs2
Approval history:
Unnamed, but probably valid.
Type description reference:
Tsu-hsiang, Y., Hsueh-tsi, C. (1979) Anduoite, a new ruthenium arsenide. Kexue Tongbao (Chinese Science Bulletin): 24(15): 704-708.

Classification of AnduoiteHide

Strunz-mindat (2025):
2.EB.15a

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
Dana 8th ed.:
2.12.2.8

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
Hey's CIM Ref.:
3.12.4

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
12 : Sulphides etc. of the platinum metals

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
AduIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of AnduoiteHide

Lustre:
Metallic
Transparency:
Opaque
Colour:
Lead gray
Streak:
Grayish black
Hardness:
6½ - 7 on Mohs scale
Hardness:
VHN50=1077.9 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Distinct/Good
One direction observed
Density:
8.692 g/cm3 (Calculated)

Optical Data of AnduoiteHide

Anisotropism:
Marked in air from brownish yellow to grayish green, pale red to pale green; pronounced in oil from reddish yellow, greenish yellow to purplish gray
Colour in reflected light:
White with pink tint
Pleochroism:
Visible
Comments:
From pinkish grayish white to pinkish white; distinct in oil

Chemistry of AnduoiteHide

Mindat Formula:
(Ru,Os)As2
Element Weights:
Element% weight
As59.719 %
Ru40.281 %

Calculated from ideal end-member formula.
Elements listed:
As, Os, Ru - search for minerals with similar chemistry
Common Impurities:
Ir,Cu,Sb,S

Crystallography of AnduoiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 5.41 Å, b = 6.206 Å, c = 3.01 Å
Ratio:
a:b:c = 0.872 : 1 : 0.485
Unit Cell V:
101.06 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Massive grains
Comment:
Point Group: 2/m 2/m 2/m or mm2.: Space Group: P nnm or P nn2

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0011943AnduoiteKjekshus A, Rakke T, Andresen A F (1977) Compounds with the marcasite type crystal structure. XII. Structural data for RuP2, RuAs2, RuSb2, OsP2, OsAs2, and OsSb2 Acta Chemica Scandinavica A31 253-2591977synthetic0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
1.920 Å(100)
1.501 Å(90)
1.095 Å(90)
1.133 Å(80)
1.210 Å(70)
1.187 Å(70)
2.000 Å(50)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 2: Planetesimal differentiation and alteration4.566-4.550
6 : Secondary asteroid phases4.566-4.560
High-? alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of AnduoiteHide

Type Locality:
ⓘ Anduo Cr deposit, Amdo Co. (Anduo Co.), Nagqu, Tibet, China
General Appearance of Type Material:
Massive grains or granular aggregates, 60-100µm in size, and of lead gray, dull metallic luster.
Place of Conservation of Type Material:
Chinese Geological museum
Geological Setting of Type Material:
Chromium deposit related to augite peridotite and dunite. Host rock is an altered dunite.
Associated Minerals at Type Locality:
IrarsiteRutheniridosmine
Reference:
Tsu-hsiang, Y., Hsueh-tsi, C. (1979) Anduoite, a new ruthenium arsenide. Kexue Tongbao (Chinese Science Bulletin): 24(15): 704-708.

Other Language Names for AnduoiteHide

Dutch:Anduoiet
Norwegian:Anduoitt
Simplified Chinese:安多矿

Relationship of Anduoite to other SpeciesHide

Member of:
Löllingite Group
Other Members of Löllingite Group:
AlloclasiteCo1-xFexAsSMon. 2 : P21
ClinosaffloriteCoAs2Mon. 2/m : P21/m
CostibiteCoSbSOrth. mm2 : Pmn21
LöllingiteFeAs2Orth. mmm (2/m 2/m 2/m) : Pnnm
NisbiteNiSb2Orth. mmm (2/m 2/m 2/m) : Pnnm
OeniteCoSbAsOrth.
Omeiite(Os,Ru)As2Orth.
ParacostibiteCoSbSOrth. mmm (2/m 2/m 2/m) : Pbca
PararammelsbergiteNiAs2Orth. mmm (2/m 2/m 2/m) : Pbca
RammelsbergiteNiAs2Orth. mmm (2/m 2/m 2/m) : Pnnm
Safflorite(Co,Ni,Fe)As2Orth. mmm (2/m 2/m 2/m) : Pnnm
UM1998-01-AsSb:CoFeNi(Fe,Ni)SbAs
Forms a series with:
OmeiiteAnduoite-Omeiite Series

Related Minerals - Strunz-mindat GroupingHide

2.EB.SelenolauriteRuSe2Iso. m3 (2/m 3) : Pa3
2.EB.AndrieslombaarditeRhSbSIso. 2 3 : P21 3
2.EB.Iridarsenite(Ir,Ru)As2Mon. 2/m : P21/b
2.EB.Kanatzidisite(SbBiS3)2Te2Mon. 2/m : P21/m
2.EB.05aVaesiteNiS2Iso. m3 (2/m 3) : Pa3
2.EB.05aHaueriteMnS2Iso. m3 (2/m 3) : Pa3
2.EB.05aLauriteRuS2Iso. m3 (2/m 3) : Pa3
2.EB.05aGaotaiiteIr3Te8Iso. m3 (2/m 3) : Pa3
2.EB.05aPenroseite(Ni,Co,Cu)Se2Iso. m3 (2/m 3) : Pa3
2.EB.05aFukuchiliteCu3FeS8Iso. m3 (2/m 3) : Pa3
2.EB.05aVillamanínite(Cu,Ni,Co,Fe)S2Tric.
2.EB.05aErlichmaniteOsS2Iso. m3 (2/m 3) : Pa3
2.EB.05aSperrylitePtAs2Iso. m3 (2/m 3) : Pa3
2.EB.05aGeversitePtSb2Iso. m3 (2/m 3) : Pa3
2.EB.05aCattieriteCoS2Iso. m3 (2/m 3) : Pa3
2.EB.05aAurostibiteAuSb2Iso. m3 (2/m 3) : Pa3
2.EB.05aTrogtaliteCoSe2Iso. m3 (2/m 3) : Pa3
2.EB.05a vCayeuxite
2.EB.05aKruťaiteCuSe2Iso. m3 (2/m 3) : Pa3
2.EB.05aPyriteFeS2Iso. m3 (2/m 3) : Pa3
2.EB.05aInsizwaitePtBi2Iso. m3 (2/m 3) : Pa3
2.EB.05bBambollaiteCu(Se,Te)2Tet.
2.EB.05aDzharkeniteFeSe2Iso. m3 (2/m 3) : Pa3
2.EB.10aMarcasiteFeS2Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.10eParacostibiteCoSbSOrth. mmm (2/m 2/m 2/m) : Pbca
2.EB.10fOeniteCoSbAsOrth.
2.EB.10ePararammelsbergiteNiAs2Orth. mmm (2/m 2/m 2/m) : Pbca
2.EB.10aMattagamiteCoTe2Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.10aFrohbergiteFeTe2Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.10dCostibiteCoSbSOrth. mm2 : Pmn21
2.EB.10bAlloclasiteCo1-xFexAsSMon. 2 : P21
2.EB.10cGlaucodot(Co0.50Fe0.50)AsSOrth. mm2 : Pmn21
2.EB.10aPetříčekiteCuSe2Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.10aKulleruditeNiSe2Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.10aFerroseliteFeSe2Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.15bSeinäjokiteFeSb2Orth.
2.EB.15aRammelsbergiteNiAs2Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.15aClinosaffloriteCoAs2Mon. 2/m : P21/m
2.EB.15cPaxiteCuAs2Mon. 2/m : P21/b
2.EB.15aNisbiteNiSb2Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.15aLöllingiteFeAs2Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.15aSafflorite(Co,Ni,Fe)As2Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.15aOmeiite(Os,Ru)As2Orth.
2.EB.20ArsenopyriteFeAsSMon. 2/m : P21/b
2.EB.20Ruarsite(Ru,Os)AsSMon.
2.EB.20Osarsite(Os,Ru)AsSMon.
2.EB.20GudmunditeFeSbSMon. 2/m : P21/b
2.EB.25MayingiteIrBiTeIso. m3 (2/m 3) : Pa3
2.EB.25MaslovitePtBiTeIso. 2 3 : P21 3
2.EB.25ParagersdorffiteNi(As,S)2Iso. m3 (2/m 3) : Pa3
2.EB.25OrthogersdorffiteNiAsSOrth. mm2 : Pca21
2.EB.25JolliffeiteNiAsSeIso. m3 (2/m 3) : Pa3
2.EB.25CobaltiteCoAsSOrth. mm2 : Pca21
2.EB.25GuixiangiteNiBiSIso. 2 3 : P21 3
2.EB.25TestibiopalladitePdSbTeIso.
2.EB.25 vaAntimony-bearing GersdorffiteNi(As,Sb)S
2.EB.25KalungaitePdAsSeIso. m3 (2/m 3) : Pa3
2.EB.25Hollingworthite(Rh,Pt,Pd)AsSIso. m3 (2/m 3) : Pa3
2.EB.25MicheneritePdBiTeIso. 2 3 : P21 3
2.EB.25GersdorffiteNiAsSIso. 2 3 : P21 3
2.EB.25MilotaitePdSbSeIso. 2 3 : P21 3
2.EB.25TolovkiteIrSbSIso.
2.EB.25PlatarsitePt(As,S)2Iso. m3 (2/m 3) : Pa3
2.EB.25WillyamiteCoSbS
2.EB.25ChangchengiteIrBiSIso. 2 3 : P21 3
2.EB.25KvačekiteNiSbSeIso. 2 3 : P21 3
2.EB.25KrutoviteNiAs2Iso. 2 3 : P21 3
2.EB.25PadmaitePdBiSeIso. 4 3 2
2.EB.25UllmanniteNiSbSIso. 2 3 : P21 3
2.EB.25Irarsite(Ir,Ru,Rh,Pt)AsSIso. m3 (2/m 3) : Pa3
2.EB.30UrvantsevitePd(Bi,Pb)2Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
2.EB.35RheniiteReS2Tric. 1 : P1

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.

Internet Links for AnduoiteHide

References for AnduoiteHide

Localities for AnduoiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Albania
 
  • Kukës County
    • Has
Gornostayev et al. (2001)
Canada
 
  • Ontario
    • Thunder Bay District
      • Coldwell complex
Ames et al. (2017) +1 other reference
Good et al. (2017)
China (TL)
 
  • Tibet
    • Nagqu
      • Amdo Co. (Anduo Co.)
Yu et al. (1979)
  • Xinjiang
    • Hami Prefecture (Kumul Prefecture; Qumul Prefecture)
      • Yizhou District
Yang et al. (2018)
Finland
 
  • Lapland
    • Sodankylä
      • Kevitsansarvi (Keivitsansarvi)
González-Pérez et al. (2021)
Greece
 
  • Thessaly
    • Trikala
      • Meteora
Kapsiotis et al. (2011)
India
 
  • Karnataka
    • Davanagere District
      • Shimoga schist belt
Ndhlovu (2017)
Russia
 
  • Chelyabinsk Oblast
Barkov et al. (2018)
  • Irkutsk Oblast
    • Uda–Biryusa district
Shvedov et al. (2017)
Kolotilina et al. (2025)
  • Krasnoyarsk Krai
    • Lysanskiy dunite-peridotite-gabbro complex
Barkov et al. (2023)
Ukraine
 
  • Cherkasy Oblast
    • Zvenyhorodka Raion
Gornostayev et al. (2001)
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