Argentopentlandite Mineral Data

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.

Name Pronunciation:

Argentopentlandite + Pronunciation

Synonym:

ICSD 40051

PDF 25-406

Argentopentlandite Image

Images:

Argentopentlandite Maucherite

Comments: Reflected light image of a polished section containing argentopentlandite (AgP) with galena (G), native silver (Ag), chalcopyrite (Ch) and maucherite (M).
Location: Silver City, Ontonagon Co., Michigan, USA. Scale: Picture Size 900 µm.
© Jeff Weissman / Photographic Guide to Mineral Species

Argentopentlandite Crystallography

Cell Dimensions:

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

Crystal System:

Isometric - Hexoctahedral H-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),

Physical Properties of Argentopentlandite

Cleavage:

{???} Good

Color:

Bronze brown.

Diaphaneity:

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:

Bulk Density (Electron Density)=4.42 gm/cc
note: Specific Gravity of Argentopentlandite =4.66 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

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

Argentopentlandite Classification

Dana Class:

02.07.01.02 (02)Sulfides - Including Selenides and Tellurides

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

(02.07.01)Pentalndite Group (Isometric: Fm3m)

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

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

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

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

02.07.01.05 Manganoshadlunite (Mn,Pb)(Cu,Fe)8S8 F m3m 4/m 3 2/m

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

Strunz Class:

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

02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)

02.BB -With Ni, Fe

02.BB.15a Argentopentlandite Ag(Fe,Ni)8S8 F m3m 4/m 3 2/m

02.BB.15a Cobaltpentlandite Co9S8 F m3m 4/m 3 2/m

02.BB.15a Geffroyite (Ag,Cu,Fe)9(Se,S)8 F m3m 4/m 3 2/m

02.BB.15a Manganoshadlunite (Mn,Pb)(Cu,Fe)8S8 F m3m 4/m 3 2/m

02.BB.15a Pentlandite (Fe,Ni)9S8 F m3m 4/m 3 2/m

02.BB.15a Shadlunite (Pb,Cd)(Fe,Cu)8S8 F 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 - 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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Argentopentlandite

Ag(Fe,Ni)8S8
Dana No: 02.07.01.02 Strunz No: 02.BB.15a
Locality:

Notes:

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