Vote for your favorite mineral in #MinCup26! - Azurite vs. Smithsonite
It's carbonate-vs-carbonate to kick off Mineral Cup 2026 with copper-rich Azurite against zinc-rich Smithsonite.
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Seinäjokite

A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
03235120017271926441034.jpg
Seinäjoki, Finland
Formula:
FeSb2
Originally given as (Fe,Ni)(Sb,As)2.
Colour:
Light gray
Lustre:
Metallic
Hardness:
5
Specific Gravity:
7.938 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for the type locality at Seinäjoki, Vaasa, Länsi-Suomen Lääni, Finland.
This page provides mineralogical data about Seinäjokite.


Hide all sections | Show all sections

Name EncodingHide

ASCII-7:
Seinajokite

Unique IdentifiersHide

Mindat ID:
3608
Long-form identifier:
mindat:1:1:3608:1

IMA Classification of SeinäjokiteHide

Classification of SeinäjokiteHide

Strunz-mindat (2026):
2.EB.15b

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.:
2.12.2.10

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
Hey's CIM Ref.:
3.12.1

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

Physical Properties of SeinäjokiteHide

Lustre:
Metallic
Transparency:
Opaque
Colour:
Light gray
Hardness:
5 on Mohs scale
Hardness:
VHN100=332 - Vickers
Density:
7.938 g/cm3 (Calculated)

Optical Data of SeinäjokiteHide

Type:
Biaxial
Anisotropism:
Distinct, brown to blue.
Reflectivity:
WavelengthR1 (%)
440nm63.8%
460nm62.4%
480nm61.4%
500nm60.8%
520nm60.8%
540nm60.8%
560nm60.8%
580nm61.0%
600nm61.4%
620nm61.9%
640nm62.7%
660nm63.4%
680nm64.3%
700nm65.3%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 65.3%.
Colour in reflected light:
Pale gray with a rose tint.

Chemistry of SeinäjokiteHide

Mindat Formula:
FeSb2

Originally given as (Fe,Ni)(Sb,As)2.
Element Weights:
Element% weight
Sb81.346 %
Fe18.655 %

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

Crystallography of SeinäjokiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 3.190(1) Å, b = 5.81(1) Å, c = 6.490(15) Å
Ratio:
a:b:c = 0.549 : 1 : 1.117
Unit Cell V:
120.29 ų (Calculated from Unit Cell)
Z:
2
Comment:
Orthorhombic or pseudo-orthorhombic.; Point Group: n.d.; Space Group: n.d.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.81 Å(100)
2.59 Å(90)
2.03 Å(80)
1.790 Å(60)
1.212 Å(5)
1.174 Å(30)
1.626 Å(20)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of SeinäjokiteHide

Other Language Names for SeinäjokiteHide

Common AssociatesHide

Associations Based on Photo Data:
1 photo of Seinäjokite associated with Native AntimonySb

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 v'Cayeuxite'
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.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.15aAnduoite(Ru,Os)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.25SulfopadmaitePdBiSIso. 2 3 : P21 3
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 va'Antimony-bearing Gersdorffite'Ni(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.25'Platarsite'Pt(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 SeinäjokiteHide

References for SeinäjokiteHide

Reference List:
Holseth, Hans, Kjekshus, Arne, Andresen, A. F., Pearson, W. B. (1968) Compounds with the Marcasite Type Crystal Structure. I. Compositions of the Binary Pnictides. Acta Chemica Scandinavica, 22. 3273-3283 doi:10.3891/acta.chem.scand.22-3273
Holseth, Hans, Kjekshus, Arne, Harnung, S. E., Lundström, Hans, Borch, Gunner, Craig, J. Cymerman (1969) Compounds with the Marcasite Type Crystal Structure. IV. The Crystal Structure of FeSb2. Acta Chemica Scandinavica, 23. 3043-3050 doi:10.3891/acta.chem.scand.23-3043
Holseth, Hans, Kjekshus, Arne, Andresen, Arne F., Schäfer, Lothar, Shimizu, Akira (1970) Compounds with the Marcasite Type Crystal Structure. VI. Neutron Diffraction Studies of CrSb2 and FeSb2. Acta Chemica Scandinavica, 24. 3309-3316 doi:10.3891/acta.chem.scand.24-3309
Mozgova, N.N., Borodaev, Yu.S., Ozerova, N.A., Paakonen, O.L., Sveshnikova, O.L., Balitskii, V.S., Dorogovin, B.A. (1976) Seinäjokite, (Fe0.8Ni0.2) (Sb1.7As0.8), and antimonian westerveldite from Seinäjoki, Finland. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 105: 617-630.
Fleischer, Michael, Pabst, Adolf, Mandarino, J. A., Chao, George Y. (1977) New mineral names. American Mineralogist, 62 (9-10) 1057-1061
Kjekshus, Arne; Peterzéns, Per G.; Rakke, Trond; Andresen, Arne F.; Hoyer, Eberhard; Spiridonov, V. P.; Strand, T. G. (1979) Compounds with the marcasite type crystal structure. XIII. Structural and magnetic properties of CrtFe1-tAs2, CrtFe1-tSb2, Fe1-tNitAs2 and Fe1-t NitSb2. Acta Chemica Scandinavica, A33. 469-480 doi:10.3891/acta.chem.scand.33a-0469
Borodaev, Yu.S.; Bortnikov, N.S.; Mozgova, N.N.; Ozerova, N.A.; Oivanen, P.; Yletyinen, V. (1983) Associations of ore minerals in the deposits of the Seinäjoki district and the discussion on the ore formation. Bulletin of the Geological Society of Finland, 55 (1). 3-23 doi:10.17741/bgsf/55.1.001 [gives TL as "Routakallio deposit"]
Lutz, H.D.; Müller, B. (1991) Lattice vibration spectra. LXVIII. Single-crystal Raman spectra of marcasite-type iron chalcogenides and pnictides, FeX2 (X=S, Se, Te; P, As, Sb). Physics and Chemistry of Minerals, 18 (4). 265-268 doi:10.1007/bf00202579
(2005) Seinäjokite. Handbook of Mineralogy. Mineralogical Society of America

Localities for SeinäjokiteHide

Showing 6 localities.

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.
Hide all sections | Show all sections

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)
Finland
 
  • South Ostrobothnia
Mozgova et al. (1976)
Williams-Jones et al. (1997)
Borodaev et al. (1983)
Greenland
 
  • Kujalleq
Petersen (2001)
Russia
 
  • Chelyabinsk Oblast
    • Karabash
      • Karabash ophiolite massif
        • Soimon Valley
Pekov (1998) +4 other references
Quick NavTopName EncodingUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 1, 2026 13:38:03 Page updated: April 15, 2026 12:50:43
Go to top of page