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Selenopolybasite

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Formula:
[(Ag,Cu)
 
6
(Sb,As)
 
2
(S,Se)
 
7
][Ag
 
9
Cu(S,Se)
 
2
Se
 
2
]
System:Trigonal
Member of:Pearceite Group
Name:Selenium analogue of polybasite.


Pearceite Group.

The Se analogue of polybasite.

Classification of Selenopolybasite

IMA status:Approved 2006
Nickel-Strunz 10th (pending) edition ID:2.GB.15

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
B : Neso-sulfarsenites, etc. with additional S
Dana 8th edition ID:3.1.7.2

3 : SULFOSALTS
1 : ø > 4
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Type Occurrence of Selenopolybasite

Type Locality:De Lamar Mine (Wahl; Sommercamp; Voschay), De Lamar District, Owyhee Co., Idaho, USA

Crystallography of Selenopolybasite

Crystal System:Trigonal
Class (H-M):3m - Ditrigonal Pyramidal
Space Group:P3 1m
Cell Parameters:a = 7.595Å, c = 12.0731Å
Ratio:a:c = 1 : 1.59
Unit Cell Volume:V 603.12 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
3.1731 (48)
3.0183 (84)
2.8880 (100)
2.5466 (23)
2.3629 (34)
2.2237 (28)
1.8987 (31)

Chemical Properties of Selenopolybasite

Formula:
[(Ag,Cu)
 
6
(Sb,As)
 
2
(S,Se)
 
7
][Ag
 
9
Cu(S,Se)
 
2
Se
 
2
]
Essential elements:Ag, Cu, S, Sb, Se
All elements listed in formula:Ag, As, Cu, S, Sb, Se

Relationship of Selenopolybasite to other Species

Member of:Pearceite Group
Other Members of Group:

- +
Cupropolybasite
[Cu
 
6
Sb
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
Pearceite
[(Ag,Cu)
 
6
(As,Sb)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
Polybasite
[(Ag,Cu)
 
6
(Sb,As)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
Related Minerals - Nickel-Strunz Grouping):

- +
2.GB.05Argentotennantite
(Ag,Cu)
 
10
(Zn,Fe)
 
2
(As,Sb)
 
4
S
 
13
2.GB.05Freibergite
(Ag
 
4+2x
Cu
 
2-2x
)[(Cu, Ag)
 
4
(Fe, Zn)
 
2
]Sb
 
4
S
 
12
S
 
1-x
 (0 < x < 1)
2.GB.05Giraudite
(Cu,Zn,Ag)
 
12
(As,Sb)
 
4
(Se,S)
 
13
2.GB.05Goldfieldite
Cu
 
12
(Te,Sb,As)
 
4
S
 
13
2.GB.05Hakite
(Cu,Hg,Ag)
 
12
Sb
 
4
(Se,S)
 
13
2.GB.05Tennantite
(Cu,Ag,Fe,Zn)
 
12
As
 
4
S
 
13
2.GB.05Tetrahedrite
(Cu,Fe,Ag,Zn)
 
12
Sb
 
4
S
 
13
2.GB.10Selenostephanite
Ag
 
5
Sb(Se,S)
 
4
2.GB.10Stephanite
Ag
 
5
SbS
 
4
2.GB.15Pearceite
[(Ag,Cu)
 
6
(As,Sb)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
2.GB.15Polybasite
[(Ag,Cu)
 
6
(Sb,As)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
2.GB.15UM2003-14-S:AgBiFeTe
Ag
 
16
FeBiTe
 
3
S
 
8
2.GB.15Cupropearceite
[Cu
 
6
As
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
2.GB.15Cupropolybasite
[Cu
 
6
Sb
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
2.GB.15UM1979-17-S:BiCuFe
Cu
 
18
Fe
 
4
BiS
 
16
2.GB.20Galkhaite
(Cs,Tl)(Hg,Cu,Zn)
 
6
(As,Sb)
 
4
S
 
12

Other Names for Selenopolybasite

Synonyms:
IMA2006-053
Other Languages:

Polytypes for Selenopolybasite

Polytypes:
Selenopolybasite-Tac

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.

References for Selenopolybasite

Reference List:

- +
Bindi, L., Evain, M., Spry, P.G., Menchetti, S. (2007): The pearceite-polybasite group of minerals: Crystal chemistry and new nomenclature rules. American Mineralogist, 92, 918-925.

Bindi, L., Evain, M., Menchetti, S. (2007): Selenopolybasite, [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2], a new member of the pearceite–polybasite group from the De Lamar mine, Owyhee County, Idaho, USA. Canadian Mineralogist, 45, 1525-1528.

Internet Links for Selenopolybasite

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    • Localities for Selenopolybasite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    China
     
    • Zhejiang Province
      • Lishui Prefecture
        • Suichang Co.
    		Zhenkuan Luo, Guiming Hu, and Kang Guan (1985): Mineral Deposits 4(4)
    Mexico
     
    • Guanajuato
      • Mun. de Guanajuato
        • La Luz
    		[Selenopolybasite-Tac] Am Min 92:918-925
    USA
     
    • Idaho
      • Owyhee Co.
        • De Lamar District
    		Bindi, L., Evain, M., Menchetti, S. (2007): Selenopolybasite, [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2], a new member of the pearceite–polybasite group from the De Lamar mine, Owyhee County, Idaho, USA. Canadian Mineralogist, 45, 1525-1528.
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