Argentopentlandite Mineral Data

Argentopentlandite Mineral Data +

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General Argentopentlandite Information

Chemical Formula:

Ag(Fe,Ni)8S8

Composition:

Molecular Weight = 816.86 gm

Iron 41.02 % Fe

Nickel 14.37 % Ni

Silver 13.21 % Ag

Sulfur 31.40 % S

______

100.00 %

Empirical Formula:

AgFe²⁺₆Ni₂S₈

Environment:

In pyrite and cubanite-chalcopyrite hydrothermal veins, and in disseminated sulfide deposits in skarn.

IMA Status:

Approved IMA 1977

Locality:

In the USSR, in the Oktyabr mine, Talnakh area, Noril'sk region, western Siberia, and the Khovuaksinsk Co-Ni deposit. In the Vuonos, Miihkali, Hietajarvi, and Outokumpu deposits, Finla Link to MinDat.org Location Data.

Name Origin:

For the similarity in composition to pentlandite.

Synonym:

ICSD 40051

PDF 25-406

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Argentopentlandite Crystallography

Cell Dimensions:

a = 10.521, Z = 4; V = 1,164.59 Den(Calc)= 4.66

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): 1.858(1), 3.17(1), 2.018(0.4),

Crystal Structure:

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Hall S R , Stewart J M , The Canadian Mineralogist , 12 (1973) p.169-177, The crystal structure of argentian pentlandite (Fe,Ni)8AgS8, compared with, the refined structure of pentlandite (Fe,Ni)9S8

Physical Properties of Argentopentlandite

Cleavage:

[???] Good

Color:

Bronze brown.

Diaphaniety:

Opaque

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Streak:

reddish brown

Optical Properties of Argentopentlandite

RL Color:

Cinnamon-brown.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Argentopentlandite in Air**
λ	R	∑ R(λ)
400 nm	20.40
420 nm	21.00
440 nm	21.90
460 nm	22.90
480 nm	24.20
500 nm	25.60
520 nm	27.20
540 nm	28.80
560 nm	30.40
580 nm	31.90
600 nm	33.30
620 nm	34.60
640 nm	35.80
660 nm	36.80
680 nm	37.80
700 nm	38.60

**Calculated Relative Intensity Colors of Argentopentlandite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%	390%
R

Calculated Properties of Argentopentlandite

Electron Density:

r_electron=4.42 gm/cc
note: r_{Argentopentlandite}=4.66 gm/cc.

Fermion Index

Fermion Index = 0.01267
Boson Index = 0.98733

Photoelectric:

PE_{Argentopentlandite}= 51.92 barns/electron
U=PE_{Argentopentlandite} x r_electron= 229.26 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Argentopentlandite is Not Radioactive

Argentopentlandite Classification

Dana Class:

2.7.1.2 (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.16-30 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 Argentopentlandite Information

References:

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

See Also:

Links to other databases for Argentopentlandite :
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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Argentopentlandite

Ag(Fe,Ni)8S8
Dana No: 2.7.1.2 Strunz No: II/B.16-30
Locality:

Notes: