Seinajokite Mineral Data

Seinajokite Mineral Data +

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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.

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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),

Physical Properties of Seinajokite

Color:

Gray.

Diaphaniety:

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:

r_electron=6.60 gm/cc
note: r_Seinajokite=7.64 gm/cc.

Fermion Index

Fermion Index = 0.0038
Boson Index = 0.9962

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Seinajokite is Not Radioactive

Seinajokite Classification

Dana Class:

2.12.2.10 (2)Sulfides - Including Selenides and Tellurides

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

(2.12.2)Marcasite Group (Orthorhombic: Pnnm)

2.12.2.1 Marcasite FeS2 Pnnm 2/m 2/m 2/m

2.12.2.2 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

2.12.2.3 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

2.12.2.4 Hastite CoSe2 Pnnm 2/m 2/m 2/m

2.12.2.5 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

2.12.2.6 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

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

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

2.12.2.9 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

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

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

2.12.2.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

2.12.2.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

Strunz Class:

II/D.23-40 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.23 - Löllingite - Costibite series

II/D.23-10 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

II/D.23-20 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

II/D.23-30 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

II/D.23-40 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m

II/D.23-50 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

II/D.23-60 Costibite CoSbS P mn2₁ mm2

II/D.23-70 Oenite! CoSbAs Unk Ortho

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Seinajokite

(Fe,Ni)(Sb,As)2
Dana No: 2.12.2.10 Strunz No: II/D.23-40
Locality:

Notes: