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Selenopolybasite

Formula:
[(Ag,Cu)
 
6
(Sb,As)
 
2
(S,Se)
 
7
][Ag
 
9
Cu(S,Se)
 
2
Se
 
2
System:Trigonal
Name:selenium analogue of polybasite
This page provides mineralogical data about Selenopolybasite.

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)

Chemical Properties of Selenopolybasite

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

Relationship of Selenopolybasite to other Species

Related Minerals - Nickel-Strunz Grouping):
2.GB.05Argentotennantite
(Ag,Cu)
 
10
(Zn,Fe)
 
2
(As,Sb)
 
4
S
 
13
2.GB.05Freibergite
(Ag,Cu,Fe)
 
12
(Sb,As)
 
4
S
 
13
2.GB.05Galkhaite
(Cs,Tl)(Hg,Cu,Zn)
 
6
(As,Sb)
 
4
S
 
12
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)
 
16
(As,Sb)
 
2
S
 
11
2.GB.15Polybasite
(Ag,Cu)
 
16
(Sb,As)
 
2
S
 
11
2.GB.15Cupropearceite
[Cu
 
6
As
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
2.GB.15IMA2008-004
[Cu
 
6
Sb
 
2
S
 
7
][Ag
 
9
CuS
 
4
]

Other Names for Selenopolybasite

Synonyms:
IMA2006-053

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

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    (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.
    Mexico
     
    • Guanajuato
      • Mun. de Guanajuato
        • La Luz
    		[var: 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.
    Mineral and/or Locality
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