Wilkmanite Mineral Data

General Wilkmanite Information

Chemical Formula:

Ni3Se4

Composition:

Molecular Weight = 491.91 gm

Nickel 35.79 % Ni

Selenium 64.21 % Se

______

100.00 %

Empirical Formula:

Ni₃Se₄

Environment:

As a primary phase and as and alteration product of sederholmite, in albite diabase sills that cut a schist formation, associated with low-grade uranium mineralization. Dimorphous w ith trustedtite.

IMA Status:

Approved IMA 1964

Locality:

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

Name Origin:

Named for W. W. Wilkman, geologist.

Name Pronunciation:

Wilkmanite + Pronunciation

Synonym:

ICSD 42558

PDF 18-890

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Wilkmanite Crystallography

Axial Ratios:

a:b:c =1.7134:1:2.898

Cell Dimensions:

a = 6.22, b = 3.63, c = 10.52, Z = 2; beta = 90.53° V = 237.52 Den(Calc)= 6.88

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m

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

By Intensity(I/I_o): 1.8(1), 2.02(1), 2.7(1),

Crystal Structure:

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Hiller J E , Wegener W , Neues Jahrbuch fur Mineralogie, Abhandlungen , 94 (1960) p.1147-1159, Untersuchungen im system nickel-selen

View Additional jPOWD Structure files for Wilkmanite
[1]

Physical Properties of Wilkmanite

Cleavage:

{001} Good

Color:

Grayish yellow.

Diaphaneity:

Opaque

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2.5 - Finger Nail

Luster:

Metallic

Optical Properties of Wilkmanite

RL Anisotrophism:

Strong, pink to yellowish green.

RL Color:

Pale pinkish yellow.

RL Pleochroism:

Distinct, pale yellow to grayish white.

Calculated Properties of Wilkmanite

Electron Density:

Bulk Density (Electron Density)=6.15 gm/cc
note: Specific Gravity of Wilkmanite =6.88 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Wilkmanite= 65.87 barns/electron
U=PE_Wilkmanite x rElectron Density= 405.34 barns/cc.

Radioactivity:

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

Wilkmanite Classification

Dana Class:

02.10.02.01 (02)Sulfides - Including Selenides and Tellurides

(02.10)where Am Bn Xp, with (m+n):p=3:4

(02.10.02)Wilkmanite Group

02.10.02.01 Wilkmanite Ni3Se4 I2/m 2/m

02.10.02.02 Brezinaite Cr3S4 I2/m 2/m

02.10.02.03 Heideite (Fe,Cr)1x(Ti,Fe)2S4 I2/m 2/m

02.10.02.04 Kingstonite! (Rh,Ir,Pt)3S4 C 2/m 2/m

Strunz Class:

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

02.D - Metal Sulfides, M:S = 3:4 and 2:3

02.DA -M:S = 3:4

02.DA.15 Brezinaite Cr3S4 I2/m 2/m

02.DA.15 Heideite (Fe,Cr)1x(Ti,Fe)2S4 I2/m 2/m

02.DA.15 Wilkmanite Ni3Se4 I2/m 2/m

Other Wilkmanite Information

References:

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

See Also:

Links to other databases for Wilkmanite :
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 Wilkmanite Specimen Label here :

Wilkmanite

Ni3Se4
Dana No: 02.10.02.01 Strunz No: 02.DA.15
Locality:

Notes: