Seinajokite Mineral Data

General Seinajokite Information

Chemical Formula:

(Fe,Ni)(Sb,As)2

Composition:

Molecular Weight = 276.64 gm

Iron 15.14 % Fe

Nickel 5.30 % Ni

Antimony 66.01 % Sb

Arsenic 13.54 % As

______

100.00 %

Empirical Formula:

Fe²⁺_0.75Ni_0.25Sb_1.5As_0.5

Environment:

In an antimony deposit, replacing antimony.

IMA Status:

Approved IMA 1976

Locality:

In the Seinäjoki deposit, Vaasa, Finland Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Seinajokite + Pronunciation

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Seinajokite Crystallography

Axial Ratios:

a:b:c =0.549:1:1.117

Cell Dimensions:

a = 3.19, b = 5.81, c = 6.49, Z = 2; V = 120.29 Den(Calc)= 7.64

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.81(1), 2.59(0.9), 2.03(0.8),

Crystal Structure:

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Kjekshus A , Peterzens P G , Rakke T , Andresen A F , Acta Chemica Scandinavica , A33 (1979) p.469-480, Compounds with the marcasite type crystal structure. XIII. Structural and, magnetic properties of CrtFe1-tAs2, CrtFe1-tSb2, Fe1-tNitAs2 and Fe1-tNitSb2, Locality: synthetic, Sample: Fe.5Ni.5Sb2

Physical Properties of Seinajokite

Color:

Gray.

Diaphaneity:

Opaque

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5 - Apatite

Luster:

Metallic

Optical Properties of Seinajokite

RL Anisotrophism:

Distinct, brown to blue.

RL Color:

Light gray with a rose tint.

Calculated Properties of Seinajokite

Electron Density:

Bulk Density (Electron Density)=6.60 gm/cc
note: Specific Gravity of Seinajokite =7.64 gm/cc.

Fermion Index:

Fermion Index = 0.003809113
Boson Index = 0.996190887

Photoelectric:

PE_Seinajokite= 242.19 barns/electron
U=PE_Seinajokite x rElectron Density=1,598.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Seinajokite is Not Radioactive

Seinajokite Classification

Dana Class:

02.12.02.10 (02)Sulfides - Including Selenides and Tellurides

(02.12)where Am Bn Xp, with (m+n):p=1:2

(02.12.02)Marcasite Group (Orthorhombic: Pnnm)

02.12.02.01 Marcasite FeS2 Pnnm 2/m 2/m 2/m

02.12.02.02 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

02.12.02.03 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

02.12.02.04 Hastite? CoSe2 Pnnm 2/m 2/m 2/m

02.12.02.05 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

02.12.02.06 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

02.12.02.07 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

02.12.02.08 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

02.12.02.09 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

02.12.02.10 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m

02.12.02.11 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

02.12.02.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

02.12.02.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

Strunz Class:

02.EB.15b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.E - Metal Sulfides, M:S £ 1:2

02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.

02.EB.15b Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m

Other Seinajokite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Seinajokite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Seinajokite Specimen Label here :

Seinajokite

(Fe,Ni)(Sb,As)2
Dana No: 02.12.02.10 Strunz No: 02.EB.15b
Locality:

Notes: