Cobaltpentlandite Mineral Data

Cobaltpentlandite Mineral Data

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General Cobaltpentlandite Information

Chemical Formula:

Co9S8

Composition:

Molecular Weight = 786.93 gm

Cobalt 67.40 % Co

Sulfur 32.60 % S

______

100.00 %

Empirical Formula:

Co₉S₈

Environment:

With other sulfides and arsenides in hydrothermal veins.

IMA Status:

Approved IMA 1959

Locality:

At the Langis mine, Casey Township, Cobalt-Gowganda area, Ontario, and the Vauze mine, north of Noranda, Quebec Canada. Link to MinDat.org Location Data.

Name Origin:

For the cobalt content and the relationship with pentlandite.

Synonym:

ICSD 40046

PDF 19-364

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Cobaltpentlandite Crystallography

Cell Dimensions:

a = 9.973, Z = 4; V = 991.92 Den(Calc)= 5.27

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 1.763(1), 3.008(1), 1.918(0.8),

Physical Properties of Cobaltpentlandite

Color:

Yellow.

Diaphaniety:

Opaque

Hardness:

4-5 - Fluorite-Apatite

Luster:

Metallic

Optical Properties of Cobaltpentlandite

RL Color:

Slightly lighter bronze yellow than pentlandite.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Cobaltpentlandite in Air**
λ	R	∑ R(λ)
400 nm	36.90
420 nm	41.90
440 nm	45.90
460 nm	49.20
480 nm	51.70
500 nm	53.80
520 nm	55.60
540 nm	57.00
560 nm	58.20
580 nm	59.20
600 nm	60.00
620 nm	60.50
640 nm	61.00
660 nm	61.20
680 nm	61.40
700 nm	61.50

**Calculated Relative Intensity Colors of Cobaltpentlandite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R

Calculated Properties of Cobaltpentlandite

Electron Density:

r_electron=4.97 gm/cc
note: r_{Cobaltpentlandite}=5.27 gm/cc.

Fermion Index

Fermion Index = 0.00244
Boson Index = 0.99756

Photoelectric:

PE_{Cobaltpentlandite}= 25.15 barns/electron
U=PE_{Cobaltpentlandite} x r_electron= 124.97 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cobaltpentlandite is Not Radioactive

Cobaltpentlandite Classification

Dana Class:

2.7.1.3 (2)Sulfides - Including Selenides and Tellurides

(2.7)where Am Bn Xp, with (m+n):p=9:8

(2.7.1)Pentalndite Group (Isometric: Fm3m)

2.7.1.1 Pentlandite (Fe,Ni)9S8 F m3m 4/m 3 2/m

2.7.1.2 Argentopentlandite Ag(Fe,Ni)8S8 F m3m 4/m 3 2/m

2.7.1.3 Cobaltpentlandite Co9S8 F m3m 4/m 3 2/m

2.7.1.4 Shadlunite (Pb,Cd)(Fe,Cu)8S8 F m3m 4/m 3 2/m

2.7.1.5 Manganese-shadlunite (Mn,Pb)(Cu,Fe)8S8 F m3m 4/m 3 2/m

2.7.1.6 Geffroyite (Ag,Cu,Fe)9(Se,S)8 F m3m 4/m 3 2/m

Strunz Class:

II/B.16-20 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides with predominant Nickel, Cobalt, Rhodium and Palladium

II/B.16 - Pentlandite group

II/B.16-10 Pentlandite (Fe,Ni)9S8 F m3m 4/m 3 2/m

II/B.16-20 Cobaltpentlandite Co9S8 F m3m 4/m 3 2/m

II/B.16-30 Argentopentlandite Ag(Fe,Ni)8S8 F m3m 4/m 3 2/m

II/B.16-40 Geffroyite (Ag,Cu,Fe)9(Se,S)8 F m3m 4/m 3 2/m

II/B.16-50 Manganese-shadlunite (Mn,Pb)(Cu,Fe)8S8 F m3m 4/m 3 2/m

II/B.16-60 Shadlunite (Pb,Cd)(Fe,Cu)8S8 F m3m 4/m 3 2/m

II/B.16-70 Palladseite Pd17Se15 P m3m 4/m 3 2/m

II/B.16-80 Miassite! Rh17S15 P m3m 4/m 3 2/m

II/B.16-80* Prassoite! Rh17S15(?) P m3m 4/m 3 2/m

Other Cobaltpentlandite Information

References:

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

See Also:

Links to other databases for Cobaltpentlandite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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

Cobaltpentlandite

Co9S8
Dana No: 2.7.1.3 Strunz No: II/B.16-20
Locality:

Notes: