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Argentopentlandite

Big Photo

Silver City, Ontonagon Co., Michigan, USA
© 2008, JGW

Formula:
Ag(Fe,Ni)
 
8
S
 
8
System:IsometricColour:Bronze brown
Hardness:3½
Name:For its silver content and relation to pentlandite.


Pentlandite Group.

Classification of Argentopentlandite

IMA status:Approved
Strunz 8th edition ID:2/B.16-30
Nickel-Strunz 10th (pending) edition ID:2.BB.15

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
B : With Ni
Dana 8th edition ID:2.7.1.2

2 : SULFIDES
7 : AmBnXp, with (m+n):p = 9:8
Hey's CIM Ref.:3.2.19

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
2 : Sulphides etc. of Ag
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Type Occurrence of Argentopentlandite

Co-type Localities:Taimyr (Oktyabr'skoye; Oktyabr'sky) Cu-Ni deposit, Noril'sk, Putoran Plateau, Taimyr Peninsula, Taymyrskiy Autonomous Okrug, Eastern-Siberian Region, Russia
Khovu-Aksy Ni-Co Deposit (Khovu-Asky), Tuva Republic, Eastern-Siberian Region, Russia
Year of Discovery:1977

Occurrences of Argentopentlandite

Geological Setting:Pyrite and cubanite hydrothermal veins, skarn deposits.

Physical Properties of Argentopentlandite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Bronze brown
Hardness (Mohs):3½
Hardness (Vickers):VHN50=132 - 154 kg/mm2
Cleavage:Very Good
Well developed on {111}
Density (calculated):4.66 g/cm3

Crystallography of Argentopentlandite

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fm3m {F4/m 3 2/m}
Space Group Setting:Fm3m
Cell Parameters:a = 10.521(3) Å
Unit Cell Volume:V 1,164.58 ų (Calculated from Unit Cell)
Z:4
Morphology:Octahedral crystals, massive.

Optical Data of Argentopentlandite

Type:Isotropic
Colour in reflected light:Cinnamon-brown

Chemical Properties of Argentopentlandite

Formula:
Ag(Fe,Ni)
 
8
S
 
8
Essential elements:Ag, Fe, S
All elements listed in formula:Ag, Fe, Ni, S
Common Impurities:Cu

Relationship of Argentopentlandite to other Species

Common Associates:
PyritePyrrhotiteMackinawiteCubaniteChalcopyrite
StanniteStanniteSphaleriteQuartzCalcite
Related Minerals - Nickel-Strunz Grouping):

- +
2.BB.Horomanite
Fe
 
6
Ni
 
3
S
 
8
2.BB.Samaniite
Cu
 
2
Fe
 
5
Ni
 
2
S
 
8
2.BB.05Heazlewoodite
Ni
 
3
S
 
2
2.BB.05Oregonite
Ni
 
2
FeAs
 
2
2.BB.05Vozhminite
(Ni,Co)
 
4
(As,Sb)S
 
2
2.BB.10Arsenohauchecornite
Ni
 
18
Bi
 
3
AsS
 
16
2.BB.10Bismutohauchecornite
Ni
 
9
Bi
 
2
S
 
8
2.BB.10Hauchecornite
Ni
 
9
Bi(Sb,Bi)S
 
8
2.BB.10Tellurohauchecornite
Ni
 
9
Bi(Te,Bi)S
 
8
2.BB.10Tučekite
Ni
 
9
Sb
 
2
S
 
8
2.BB.15Cobaltpentlandite
(Co,Ni,Fe)
 
9
S
 
8
2.BB.15Geffroyite
(Cu,Fe,Ag)
 
9
(Se,S)
 
8
2.BB.15Godlevskite
(Ni,Fe)
 
9
S
 
8
2.BB.15Kharaelakhite
(Pt,Cu,Pb,Fe,Ni)
 
9
S
 
8
2.BB.15Manganoshadlunite
(Mn,Pb,Cd)(Cu,Fe)
 
8
S
 
8
2.BB.15Pentlandite
(Fe,Ni)
 
9
S
 
8
2.BB.15Shadlunite
(Pb,Cd)(Fe,Cu)
 
8
S
 
8
2.BB.15Sugakiite
Cu(Fe,Ni)
 
8
S
 
8
Related Minerals - Hey's Index Grouping:

- +
3.2.1Acanthite
Ag
 
2
S
3.2.3Naumannite
Ag
 
2
Se
3.2.4Aguilarite
Ag
 
4
SeS
3.2.5Hessite
Ag
 
2
Te
3.2.6Empressite
AgTe
3.2.7Stützite
Ag
 
5-x
Te
 
3
, x = 0.24-0.36
3.2.8Cervelleite
Ag
 
4
TeS
3.2.9Dervillite
Ag
 
2
AsS
 
2
3.2.10Stromeyerite
AgCuS
3.2.11Mckinstryite
(Ag,Cu)
 
2
S
3.2.12Jalpaite
Ag
 
3
CuS
 
2
3.2.13Eucairite
AgCuSe
3.2.14Cameronite
AgCu
 
7
Te
 
10
3.2.15Henryite
Ag
 
3
Cu
 
4
Te
 
4
3.2.16Sternbergite
AgFe
 
2
S
 
3
3.2.17Argentopyrite
AgFe
 
2
S
 
3
3.2.18Geffroyite
(Cu,Fe,Ag)
 
9
(Se,S)
 
8

Other Names for Argentopentlandite

Synonyms:
IMA1970-047
Other Languages:
German:Argentopentlandit
Spanish:Argentopentlandita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:Minor silver ore

References for Argentopentlandite

Reference List:Mineralogical Abstracts: 30: 71.

Internet Links for Argentopentlandite

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    Localities for Argentopentlandite

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