Sederholmite Mineral Data

Sederholmite Mineral Data +

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General Sederholmite Information

Chemical Formula:

NiSe

Composition:

Molecular Weight = 137.65 gm

Nickel 42.64 % Ni

Selenium 57.36 % Se

______

100.00 %

Empirical Formula:

NiSe

Environment:

In calcite veins, in sills of albitite diabase in schist, associated with low-grade uranium mineralization. As grains in clausthalite.

IMA Status:

Approved IMA 1964

Locality:

Kuusamo, northeastern Finland Link to MinDat.org Location Data.

Name Origin:

Named for J. J. Sederholm, former Director of the Gological Survey of Finland.

Synonym:

ICSD 29310

Nickel Selenide

PDF 18-188

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Sederholmite Crystallography

Axial Ratios:

a:c = 1:1.46301

Cell Dimensions:

a = 3.65, c = 5.34, Z = 2; V = 61.61 Den(Calc)= 7.42

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 2.7(1), 2.015(0.8), 1.806(0.6),

Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, Note: ideal nickel arsenide structure

View Additional jPOWD Structure files for Sederholmite
[1] [2] [3] [4]

Physical Properties of Sederholmite

Cleavage:

None

Color:

Yellow, Orange yellow.

Diaphaniety:

Opaque

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic

Optical Properties of Sederholmite

RL Anisotrophism:

Strong to distinct, in pinkish to greenish colors.

RL Color:

Yellow to orange yellow.

RL Pleochroism:

Distinct in shades of yellow.

Calculated Properties of Sederholmite

Electron Density:

r_electron=6.68 gm/cc
note: r_Sederholmite=7.42 gm/cc.

Fermion Index

Fermion Index = 0.04841
Boson Index = 0.95159

Photoelectric:

PE_Sederholmite= 63.01 barns/electron
U=PE_Sederholmite x r_electron= 421.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sederholmite is Not Radioactive

Sederholmite Classification

Dana Class:

2.8.11.3 (2)Sulfides - Including Selenides and Tellurides

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

(2.8.11)Nickeline Group (Hexagonal: P63/mmc)

2.8.11.1 Nickeline NiAs P 6₃/mmc 6/m 2/m 2/m

2.8.11.2 Breithauptite NiSb P 6₃/mmc 6/m 2/m 2/m

2.8.11.3 Sederholmite NiSe P 6₃/mmc 6/m 2/m 2/m

2.8.11.4 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 6₃/mmc 6/m 2/m 2/m

2.8.11.5 Sudburyite (Pd,Ni)Sb P 6₃/mmc 6/m 2/m 2/m

2.8.11.6 Kotulskite Pd(Te,Bi) P 6₃/mmc 6/m 2/m 2/m

2.8.11.7 Sobolevskite PdBi P 6₃/mmc 6/m 2/m 2/m

2.8.11.8 Stumpflite Pt(Sb,Bi) P 6₃/mmc 6/m 2/m 2/m

2.8.11.9 Langisite (Co,Ni)As P 6₃/mmc 6/m 2/m 2/m

2.8.11.10 Freboldite CoSe P 6₃/mmc 6/m 2/m 2/m

2.8.11.11 Sorosite! Cu(Sn,Sb) P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

II/C.20-50 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.20 - Nickeline group and related compounds, Polarite - Cherepanovite series

II/C.20-05 Sorosite! Cu(Sn,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-10 Langisite (Co,Ni)As P 6₃/mmc 6/m 2/m 2/m

II/C.20-20 Nickeline NiAs P 6₃/mmc 6/m 2/m 2/m

II/C.20-30 Breithauptite NiSb P 6₃/mmc 6/m 2/m 2/m

II/C.20-40 Freboldite CoSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-50 Sederholmite NiSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-70 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-75 Yuanjiangite AuSn P 6₃/mmc 6/m 2/m 2/m

II/C.20-80 Kotulskite Pd(Te,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-90 Sudburyite (Pd,Ni)Sb P 6₃/mmc 6/m 2/m 2/m

II/C.20-95 Stumpflite Pt(Sb,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-100 Polarite Pd(Bi,Pb) Ccm21 mm2

II/C.20-110 Sobolevskite PdBi P 6₃/mmc 6/m 2/m 2/m

II/C.20-120 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m

II/C.20-130 Cherepanovite RhAs P nma 2/m 2/m 2/m

Other Sederholmite Information

References:

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

See Also:

Links to other databases for Sederholmite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Sederholmite

NiSe
Dana No: 2.8.11.3 Strunz No: II/C.20-50
Locality:

Notes: