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Orileyite

A discredited species name
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Formula:
(Fe,Cu)2As
Fe:Cu = 4:1.
Colour:
Steel gray with a purplish tint
Lustre:
Metallic
Hardness:
5½
Specific Gravity:
7.34 - 7.42
Name:
According to the Proceedings of the Asiatic Society of Bengal, Sept. 1870 p. 279-283 (https://www.biodiversitylibrary.org/item/130586#page/333/mode/1up), citied in Dana's System (7th), the analyst who reported it, D. Waldie, proposed the name for "Mr. O'Riley," who found and submitted the samples.
Bayliss (2000) states that "orileyite" is a mixture of domeykite and algodonite.

Originally reported from Myanmar (Burma).

Fe2As is known as a synthetic (tetragonal) compound.


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Unique IdentifiersHide

Mindat ID:
8125
Long-form identifier:
mindat:1:1:8125:8

IMA Classification of OrileyiteHide

IMA status:
Discredited

Classification of OrileyiteHide

Strunz-mindat (2025):
2.BA.

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au

Physical Properties of OrileyiteHide

Lustre:
Metallic
Colour:
Steel gray with a purplish tint
Streak:
Dark gray
Hardness:
5½ on Mohs scale
Density:
7.34 - 7.42 g/cm3 (Measured)    

Chemistry of OrileyiteHide

Mindat Formula:
(Fe,Cu)2As

Fe:Cu = 4:1.
Element Weights:
Element% weight
Fe59.852 %
As40.148 %

Calculated from ideal end-member formula.
Elements listed:
As, Cu, Fe - search for minerals with similar chemistry

Other Language Names for OrileyiteHide

German:Orileyit
Spanish:Orileyita

Related Minerals - Strunz-mindat GroupingHide

2.BA.MakotoiteAg12(Cu3Au)S8Trig. 3m (3 2/m) : R3c
2.BA.AlburniteAg8GeTe2S4Iso.
2.BA.DzierżanowskiteCaCu2S2Trig. 3m (3 2/m) : P3m1
2.BA.XuwenyuaniteAg9Fe3+Te2S4Iso. 4 3m : F4 3m
2.BA.Juxingite Bi6Cu140Fe30S125Iso. 4 3m : F4 3m
2.BA.05DjurleiteCu31S16Mon. 2/m
2.BA.05GeeriteCu8S5Trig. 3
2.BA.05RoxbyiteCu58S32Tric. 1 : P1
2.BA.05ChalcociteCu2SMon. 2/m : P21/b
2.BA.10DigeniteCu9S5Trig. 3m (3 2/m) : R3m
2.BA.10AniliteCu7S4Orth. mmm (2/m 2/m 2/m) : Pnma
2.BA.15BorniteCu5FeS4Orth. mmm (2/m 2/m 2/m) : Pbca
2.BA.20BellidoiteCu2SeTet. 4/m : P42/n
2.BA.20BerzelianiteCu2-xSe (x ≈ 0.12)Iso. m3m (4/m 3 2/m) : Fm3m
2.BA.25AthabascaiteCu5Se4Orth.
2.BA.25UmangiteCu3Se2Tet. 4 2m : P4 21m
2.BA.30RickarditeCu7Te5Orth. mmm (2/m 2/m 2/m) : Pmmn
2.BA.30WeissiteCu2-xTeHex. 6/mmm (6/m 2/m 2/m) : P6/mmm
2.BA.35AcanthiteAg2SMon. 2/m : P21/m
2.BA.35SpryiteAg8(As3+0.5As5+0.5)S6Orth. mm2 : Pna21
2.BA.40dUM2003-13-S:AgAuCuAg6AuCu2S5
2.BA.40MckinstryiteAg5-xCu3+xS4Orth. mmm (2/m 2/m 2/m) : Pnma
2.BA.40StromeyeriteAgCuSOrth. mmm (2/m 2/m 2/m)
2.BA.42HoneaiteAu3TlTe2 Orth. mmm (2/m 2/m 2/m) : Pbcm
2.BA.45JalpaiteAg3CuS2Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
2.BA.45SelenojalpaiteAg3CuSe2Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
2.BA.45KuriliteAg8Te3SeTrig. 3 : R3
2.BA.47Spiridonovite(Cu1-xAgx)2TeTrig. 3m (3 2/m) : P3c1
2.BA.50WuyanzhiiteCu2STet. 4 2 2 : P43 21 2
2.BA.50EucairiteAgCuSeOrth.
2.BA.52ArgentiteAg2SIso.
2.BA.55NaumanniteAg2SeOrth. 2 2 2 : P21 21 21
2.BA.55AguilariteAg4SeSMon. 2/m
2.BA.60ChenguodaiteAg9Fe3+Te2S4Orth.
2.BA.60HessiteAg2TeMon. 2/m : P21/b
2.BA.60CervelleiteAg4TeSMon. 2/m
2.BA.65Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40 Iso. m3m (4/m 3 2/m) : Fd3c
2.BA.65StütziteAg5-xTe3, x = 0.24-0.36Hex. 6 : P6
2.BA.70ArgyroditeAg8GeS6Orth. mm2 : Pna21
2.BA.70Putzite(Cu4.7Ag3.3)GeS6Iso. 4 3m : F4 3m
2.BA.70CanfielditeAg8SnS6Orth. mm2 : Pna21
2.BA.75FischesseriteAg3AuSe2Iso. 4 3 2 : I41 3 2
2.BA.75UytenbogaardtiteAg3AuS2Trig. 3m (3 2/m) : R3c
2.BA.75Penzhinite(Ag,Cu)4Au(S,Se)4Hex. 6 2 2 : P63 2 2
2.BA.75PetrovskaiteAuAgSMon.
2.BA.75PetziteAg3AuTe2Iso. 4 3 2 : I41 3 2
2.BA.80Bezsmertnovite(Au,Ag)4Cu(Te,Pb)Orth.
2.BA.80BilibinskitePbCu2Au3Te2Iso.
2.BA.80Bogdanovite(Au,Te,Pb)3(Cu,Fe)Iso.

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 OrileyiteHide

References for OrileyiteHide

Reference List:
https://legacy.materialsproject.org/materials/mp-20426/
Palache, Charles, Berman, Harry, Frondel, Clifford (1944) The System of Mineralogy (7th ed.) Vol. 1 - Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, New York.
Katsuraki, Hisao (1964) Neutron Diffraction Study of Fe2As Single Crystals. Journal of the Physical Society of Japan, 19 (10). 1988 doi:10.1143/jpsj.19.1988
Katsuraki, Hisao, Suzuki, Kazuo (1965) Magnetic Structure of Fe2As. Journal of Applied Physics, 36 (3). 1094-1095 doi:10.1063/1.1714113
Katsuraki, Hisao, Achiwa, Norio (1966) The Magnetic Structure of Fe2As. Journal of the Physical Society of Japan, 21 (11). 2238-2243 doi:10.1143/jpsj.21.2238
Kjekshus, Arne, Skaug, Kjell Erik, Sæthre, Leif J., Sjöstrand, Elisabeth, Svensson, Sigfrid (1972) On the Phases Cr2As, Fe2As, Co2As, and Rh2As. Acta Chemica Scandinavica, 26. 2554-2556 doi:10.3891/acta.chem.scand.26-2554
Kanomata, Takeshi, Goto, Takao, Ido, Hideaki (1977) Magnetic Phase Transitions in the Fe2As-Mn2As System. Journal of the Physical Society of Japan, 43 (4). 1178-1184 doi:10.1143/jpsj.43.1178
Rancourt, D. G., Daniels, J. M., Lam, H-Y. (1985) A 57Fe Mössbauer study of Fe2As: a magnetically induced electric-field-gradient asymmetry. Canadian Journal of Physics, 63. 1540-1547 doi:10.1139/p85-256
Kulshreshtha, S. K. (1990) On Mössbauer Spectrum Analysis for Spin Orientation in Fe2As. physica status solidi (b), 160 (1). 313-320 doi:10.1002/pssb.2221600130
Matsushita, Tomohiro, Kimura, Akio, Daimon, Hiroshi, Suga, Shigemasa, Kanomata, Takeshi, Kaneko, Takejiro (1992) Resonance Photoemission Spectroscopy of Mn2As, Cr2As and Fe2As. Japanese Journal of Applied Physics, 31. doi:10.1143/jjap.31.l1767
Bayliss, Peter (2000) Glossary of Obsolete Mineral Names. The Mineralogical Record, Inc., Tucson, AZ.
Dai, Guangyang, Zhang, Changling, Zhang, Sijia, He, Xin, Ren, Chongwen, Zhao, Jianfa, Li, Xiaodong, Wang, Xiancheng, Jin, Changqing (2020) Crystal Growth and Investigation of High-Pressure Physical Properties of Fe2As. Crystals, 10 (9) 790pp. doi:10.3390/cryst10090790

Localities for OrileyiteHide

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.
Austria
 
  • Vorarlberg
    • Bludenz District
      • Silbertal
Krause et al. (2025)
Myanmar
 
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