For Mount Omei (Mount Emei) (in standard Chinese phonetics "Emei", or "Emeishan"), after which the igneous province was named in which the type locality is situated.

Type Locality:

ⓘ Yangliuping Cu-Ni-PGE deposit, Yangliuping Cu-Ni-PGE ore field, Danba Co., Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture), Sichuan, China

Anduoite-Omeiite Series.

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Unique IdentifiersHide

Mindat ID:

2990

Long-form identifier:

mindat:1:1:2990:8

GUID
(UUID V4):

8a696b4b-8815-435a-b4f8-d6f941a7390e

IMA Classification of OmeiiteHide

IMA status:

Approved

IMA Formula:

OsAs₂

First published:

1978

Type description reference:

Ren, Y., Hu, Q., Xu, J. (1978) A preliminary study of the new mineral of platinum group - Omeiite OsAs2. Acta Geologica Sinica: 52(2): 163-167

Classification of OmeiiteHide

Strunz-mindat (2024):

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.:

2.12.2.7

2 : SULFIDES
12 : A_mB_nX_p, with (m+n):p = 1:2

Hey's CIM Ref.:

3.12.58

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.

Symbol	Source	Reference
Ome	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of OmeiiteHide

Lustre:

Metallic

Transparency:

Opaque

Colour:

Dull steel gray

Hardness:

7 on Mohs scale

Tenacity:

Brittle

Cleavage:

Distinct/Good
Parallel to elongation

Density:

11.20 g/cm³ (Calculated)

Optical Data of OmeiiteHide

Anisotropism:

Distinct

Reflectivity:

Wavelength	R₁	R₂
480nm	37.86%	39.08%
546nm	39.18%	40.43%
589nm	42.06%	42.15%
656nm	46.35%	48.93%

Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 48.93%.
R₁ shown in black, R₂ shown in red

Colour in reflected light:

White with a yellow tint in air, milky yellow in oil

Pleochroism:

Weak

Comments:

yellow to grayish yellow

Chemistry of OmeiiteHide

Mindat Formula:

(Os,Ru)As₂

Elements listed:

As, Os, Ru - search for minerals with similar chemistry

Common Impurities:

Ir,Ni,Fe,Co

Crystallography of OmeiiteHide

Crystal System:

Orthorhombic

Cell Parameters:

a = 5.409 Å, b = 6.167 Å, c = 3.021 Å

Ratio:

a:b:c = 0.877 : 1 : 0.49

Unit Cell V:

100.77 Å³ (Calculated from Unit Cell)

Comment:

Point Group: 2/m 2/m 2/m, or mm2.; : Space Group: P nnm or P nn2.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0011946	Omeiite	Kjekshus 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 253-259		1977	synthetic	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Omeiite'
loop_
_publ_author_name
'Kjekshus A'
'Rakke T'
'Andresen A F'
_journal_name_full 'Acta Chemica Scandinavica'
_journal_volume A31 
_journal_year 1977
_journal_page_first 253
_journal_page_last 259
_publ_section_title
;
 Compounds with the marcasite type crystal structure. XII. Structural data for
 RuP2, RuAs2, RuSb2, OsP2, OsAs2, and OsSb2
;
_database_code_amcsd 0011946
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Os As2'
_cell_length_a 5.4115
_cell_length_b 6.1900
_cell_length_c 3.0127
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 100.917
_exptl_crystal_density_diffrn     11.190
_symmetry_space_group_name_H-M 'P n n m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  'x,y,-z'
  '-x,-y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Os   0.00000   0.00000   0.00000
As   0.17010   0.36710   0.00000

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
2.63 Å	(100)
1.915 Å	(100)
2.67 Å	(80)
4.06 Å	(60)
2.06 Å	(60)
2.01 Å	(60)
1.209 Å	(60)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 2: Planetesimal differentiation and alteration	4.566-4.550
6 : Secondary asteroid phases	4.566-4.560
High-𝑇 alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of OmeiiteHide

Type Locality:

ⓘ Yangliuping Cu-Ni-PGE deposit, Yangliuping Cu-Ni-PGE ore field, Danba Co., Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture), Sichuan, China

General Appearance of Type Material:

Crystals are tabular or elongated parallel to [010], to 20 µm

Place of Conservation of Type Material:

Museum of Geology, National Bureau of Geology

Geological Setting of Type Material:

In a Cu–Ni sulfide deposit associated with an ultramafic body

Associated Minerals at Type Locality:

Violarite	Testibiopalladite	Sudburyite	Sphalerite	Sperrylite
Pyrrhotite	Pentlandite	Michenerite	Magnetite	Linnaeite
Kotulskite	Gold	Galena	Electrum	Cubanite
Chalcopyrite	Bornite

Reference:

Ren, Y., Hu, Q., Xu, J. (1978) A preliminary study of the new mineral of platinum group - Omeiite OsAs2. Acta Geologica Sinica: 52(2): 163-167

Other Language Names for OmeiiteHide

German:Omeiit

Russian:Омейит

Simplified Chinese:峨眉矿
砷锇矿

Spanish:Omeiita

Relationship of Omeiite to other SpeciesHide

Member of:

Löllingite Group

Other Members of this group:

Alloclasite	Co_1-xFe_xAsS	Mon. 2 : P2₁
Anduoite	(Ru,Os)As₂	Orth.
Clinosafflorite	CoAs₂	Mon. 2/m : P2₁/m
Costibite	CoSbS	Orth. mm2 : Pmn2₁
Löllingite	FeAs₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
Nisbite	NiSb₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
Oenite	CoSbAs	Orth.
Paracostibite	CoSbS	Orth. mmm (2/m 2/m 2/m) : Pbca
Pararammelsbergite	NiAs₂	Orth. mmm (2/m 2/m 2/m) : Pbca
Rammelsbergite	NiAs₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
Safflorite	(Co,Ni,Fe)As₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
UM1998-01-AsSb:CoFeNi	(Fe,Ni)SbAs

Forms a series with:

Anduoite

Anduoite-Omeiite Series

Related Minerals - Strunz-mindat Grouping Hide

2.EB.	Iridarsenite	(Ir,Ru)As₂	Mon. 2/m : P2₁/b
2.EB.	Selenolaurite	RuSe₂	Iso. m3 (2/m 3) : Pa3
2.EB.	Andrieslombaardite	RhSbS	Iso. 2 3 : P2₁ 3
2.EB.	Kanatzidisite	(SbBiS₃)₂Te₂	Mon. 2/m : P2₁/m
2.EB.05a	Aurostibite	AuSb₂	Iso. m3 (2/m 3) : Pa3
2.EB.05b	Bambollaite	Cu(Se,Te)₂	Tet.
2.EB.05a	Cattierite	CoS₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Erlichmanite	OsS₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Fukuchilite	Cu₃FeS₈	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Geversite	PtSb₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Hauerite	MnS₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Insizwaite	Pt(Bi,Sb)₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Krut'aite	CuSe₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Laurite	RuS₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Penroseite	(Ni,Co,Cu)Se₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Pyrite	FeS₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Sperrylite	PtAs₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Trogtalite	CoSe₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Vaesite	NiS₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Villamanínite	(Cu,Ni,Co,Fe)S₂	Tric.
2.EB.05a	Dzharkenite	FeSe₂	Iso. m3 (2/m 3) : Pa3
2.EB.05a	Gaotaiite	Ir₃Te₈	Iso. m3 (2/m 3) : Pa3
2.EB.05a v	Cayeuxite
2.EB.10b	Alloclasite	Co_1-xFe_xAsS	Mon. 2 : P2₁
2.EB.10d	Costibite	CoSbS	Orth. mm2 : Pmn2₁
2.EB.10a	Ferroselite	FeSe₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.10a	Frohbergite	FeTe₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.10c	Glaucodot	(Co_0.50Fe_0.50)AsS	Orth. mm2 : Pmn2₁
2.EB.10a	Kullerudite	NiSe₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.10a	Marcasite	FeS₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.10a	Mattagamite	CoTe₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.10e	Paracostibite	CoSbS	Orth. mmm (2/m 2/m 2/m) : Pbca
2.EB.10e	Pararammelsbergite	NiAs₂	Orth. mmm (2/m 2/m 2/m) : Pbca
2.EB.10f	Oenite	CoSbAs	Orth.
2.EB.10a	Petříčekite	CuSe₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.15a	Anduoite	(Ru,Os)As₂	Orth.
2.EB.15a	Clinosafflorite	CoAs₂	Mon. 2/m : P2₁/m
2.EB.15a	Löllingite	FeAs₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.15a	Nisbite	NiSb₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.15c	Paxite	CuAs₂	Mon. 2/m : P2₁/b
2.EB.15a	Rammelsbergite	NiAs₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.15a	Safflorite	(Co,Ni,Fe)As₂	Orth. mmm (2/m 2/m 2/m) : Pnnm
2.EB.15b	Seinäjokite	(Fe,Ni)(Sb,As)₂	Orth.
2.EB.20	Arsenopyrite	FeAsS	Mon. 2/m : P2₁/b
2.EB.20	Gudmundite	FeSbS	Mon. 2/m : P2₁/b
2.EB.20	Osarsite	(Os,Ru)AsS	Mon.
2.EB.20	Ruarsite	(Ru,Os)AsS	Mon.
2.EB.25 va	Antimony-bearing Gersdorffite	Ni(As,Sb)S
2.EB.25	Cobaltite	CoAsS	Orth. mm2 : Pca2₁
2.EB.25	Gersdorffite	NiAsS	Iso. m3 (2/m 3) : Pa3
2.EB.25	Hollingworthite	(Rh,Pt,Pd)AsS	Iso. m3 (2/m 3) : Pa3
2.EB.25	Irarsite	(Ir,Ru,Rh,Pt)AsS	Iso. m3 (2/m 3) : Pa3
2.EB.25	Jolliffeite	NiAsSe	Iso. m3 (2/m 3) : Pa3
2.EB.25	Krutovite	NiAs₂	Iso. 2 3 : P2₁ 3
2.EB.25	Maslovite	PtBiTe	Iso. 2 3 : P2₁ 3
2.EB.25	Michenerite	PdBiTe	Iso. 2 3 : P2₁ 3
2.EB.25	Padmaite	PdBiSe	Iso. 4 3 2
2.EB.25	Platarsite	Pt(As,S)₂	Iso. m3 (2/m 3) : Pa3
2.EB.25	Testibiopalladite	PdSbTe	Iso.
2.EB.25	Tolovkite	IrSbS	Iso.
2.EB.25	Ullmannite	NiSbS	Iso. 2 3 : P2₁ 3
2.EB.25	Willyamite	CoSbS
2.EB.25	Changchengite	IrBiS	Iso. 2 3 : P2₁ 3
2.EB.25	Mayingite	IrBiTe	Iso. m3 (2/m 3) : Pa3
2.EB.25	Kalungaite	PdAsSe	Iso. m3 (2/m 3) : Pa3
2.EB.25	Milotaite	PdSbSe	Iso. 2 3 : P2₁ 3
2.EB.25	Paragersdorffite	Ni(As,S)₂	Iso. m3 (2/m 3) : Pa3
2.EB.25	Orthogersdorffite	NiAsS	Orth. mm2 : Pca2₁
2.EB.30	Urvantsevite	Pd(Bi,Pb)₂	Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
2.EB.35	Rheniite	ReS₂	Tric. 1 : P1

Other InformationHide

Notes:

Insoluble in HCl and HNO3 and dissolves with difficulty in aqua regia.

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 OmeiiteHide

mindat.org URL:

https://www.mindat.org/min-2990.html
Please feel free to link to this page.

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for OmeiiteHide

Reference List:

Holseth, H., Kjekshus, A. (1968) Compounds with the marcasite type crystal structure. I. Compositions of the binary pnictides. Acta Chemica Scandinavica: 22: 3273-3283.

Kjekshus, A., Rakke, T., Andresen, A.F. (1977) Compounds with the marcasite type crystal structure. XII. Structural data for RuP2, RuAs2, RuSb2, OsP2, OsAs2, OsSb2. Acta Chemica Scandinavica: A31: 253-259.

Ren, Y., Hu, Q., Xu, J. (1978) A preliminary study of the new mineral of platinum group - Omeiite OsAs2. Acta Geologica Sinica: 52(2): 163-167. [in Chinese with English abstract]

Ren, Y., Hu, Q., Xu, J. (1978) A preliminary study of the new mineral of platinum group - Omeiite OsAs2. Acta Geologica Sinica: 52(2): 163-167

Chao, G.Y. (1979) New mineral names. American Mineralogist: 64: 464.

(2023) Omeiite. Handbook of Mineralogy. Mineralogical Society of America

Localities for OmeiiteHide

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.


Brazil
Minas Gerais ⓘ Fortaleza de Minas	Almeida et al. (2007)
ⓘ O'Toole deposit	Marchetto (1990)

Chile
Araucanía Cautín Province ⓘ La Cabaña	González-Jiménez et al. (2016)
ⓘ La Cabaña serpentinites	Galdames et al. (2010) +1 other reference

China (TL)
Sichuan Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture) Danba Co. Yangliuping Cu-Ni-PGE ore field ⓘ Yangliuping Cu-Ni-PGE deposit (TL)	Ren Yingxin et al. (1978) +3 other references

Greece
Thessaly Trikala Meteora ⓘ Pefki	Argirios Kapsiotis et al. (2011)

India
Odisha Jajapur (Jajpur) District Sukinda ultramafic complex Sukinda Valley Sukinda Mines ⓘ Katpal chromite mine	Raju et al. (2007)

Kazakhstan
Aktobe Region Kargaly District ⓘ Kempirsai Cr deposit	doi.org (n.d.) +1 other reference

Russia
Irkutsk Oblast ⓘ Tokty-Oi intrusion	Kolotilina et al. (2019)
Uda–Biryusa district ⓘ Ognit complex	Shvedov et al. (2017)
ⓘ Tartai Massif	Podlipsky et al. (2015)
ⓘ Zhelos intrusion	Kolotilina et al. (2019)
Tuva Kaa-Khemsky District Kaakhem ophiolite belt ⓘ Kundus placer	Oidup et al. (2012)

Ukraine
Cherkasy Oblast Zvenyhorodka Raion ⓘ Kapitanov Cr deposit	Gornostayev et al. (2002)

USA
Pennsylvania Chester County ⓘ West Nottingham Township	Smith and Barnes (2011)

Omeiite