Polybasite-Tac
A structural variant of Polybasite
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About Polybasite-Tac
Formula:
[Ag6Sb2S7][Ag9CuS4]
Colour:
Black
Lustre:
Sub-Metallic
Hardness:
3
Specific Gravity:
6.33 - 6.35
Crystal System:
Trigonal
A polytype of Polybasite
Previously known as "antimonpearceite", which was originally described from Sonora, Mexico. Was renamed during a nomenclature change in 2006 (Bindi et al., 2007).
A Se-bearing variety has been described by Marquez-Zavalia et al. (2008).
Previously known as "antimonpearceite", which was originally described from Sonora, Mexico. Was renamed during a nomenclature change in 2006 (Bindi et al., 2007).
A Se-bearing variety has been described by Marquez-Zavalia et al. (2008).
Unique Identifiers
Mindat ID:
265
Long-form identifier:
mindat:1:1:265:1
IMA Classification of Polybasite-Tac
IMA status notes:
Redefined by the IMA
Approval history:
Renamed by IMA: 2006
Classification of Polybasite-Tac
2.GB.
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
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
5.2.14
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag
5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag
Physical Properties of Polybasite-Tac
Sub-Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Density:
6.33 - 6.35 g/cm3 (Measured) 6.40 g/cm3 (Calculated)
Chemistry of Polybasite-Tac
Mindat Formula:
[Ag6Sb2S7][Ag9CuS4]
Element Weights:
Elements listed:
Common Impurities:
Fe
Crystallography of Polybasite-Tac
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3m1
Cell Parameters:
a = 7.40-7.60 Å, c = 11.86-12.06 Å
Ratio:
a:c = 1 : 1.603
Unit Cell V:
562.44 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Thin tabular hexagonal crystals.
Twinning:
On {110}
Comment:
Bindi et al. (2007) give: a = 7.4805(5), c = 11.8836(13) Å, V 575.89(8). Other unit-cell parameters reported: a = 7.455, c = 11.847 Å. Three Se-bearing samples (Márquez-Zavalía et al., 2008) have the following unit-cell parameters: 7.425(2), 11.853(4) Å, 7.465(1), 11.908(3) Å, 7.521(1), 11.965(3) Å.
Geological Environment
Geological Setting:
Epithermal precious metal deposits
Synonyms of Polybasite-Tac
Other Language Names for Polybasite-Tac
Common Associates
Associated Minerals Based on Photo Data:
| 10 photos of Polybasite-Tac associated with Chalcopyrite | CuFeS2 |
| 4 photos of Polybasite-Tac associated with Arsenopyrite | FeAsS |
| 3 photos of Polybasite-Tac associated with Famatinite | Cu3SbS4 |
| 1 photo of Polybasite-Tac associated with Rhabdophane-(Ce) | Ce(PO4) · 0.6H2O |
| 1 photo of Polybasite-Tac associated with Proustite | Ag3AsS3 |
| 1 photo of Polybasite-Tac associated with Luzonite | Cu3AsS4 |
| 1 photo of Polybasite-Tac associated with Pyrargyrite | Ag3SbS3 |
| 1 photo of Polybasite-Tac associated with Preisingerite | Bi3(AsO4)2O(OH) |
| 1 photo of Polybasite-Tac associated with Tetrahedrite Subgroup | Cu6(Cu4C2+2)Sb4S12S |
| 1 photo of Polybasite-Tac associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 2.GB. | Kenoargentotetrahedrite-(Zn) | [Ag6]4+(Cu4Zn2)Sb4S12◻ |
| 2.GB. | Argentotetrahedrite-(Hg) | Ag6(Cu4Hg2)Sb4S12S |
| 2.GB. | Annivite-(Zn) | Cu6(Cu4Zn2)Bi4S12S |
| 2.GB. | Pošepnýite | (Cu+3◻3)(Hg2+4Cu+2)Sb4Se12(Se0.5◻0.5) |
| 2.GB. | Tennantite-(Cu) | Cu6(Cu4Cu2)As4S12S |
| 2.GB. | Argentopolybasite | [Ag6Sb2S7][Ag9AgS4] |
| 2.GB. | Tennantite-(Mn) | Cu6(Cu4Mn2)As4S12S |
| 2.GB. | Argentotetrahedrite-(Cd) | Ag6(Cu4Cd2)Sb4S12S |
| 2.GB. | Stibioústalečite | (Cu4Cu2)(Cu4Cu+2)(Sb2Te2)Se12Se |
| 2.GB. | Stibiogoldfieldite | (Cu4Cu2)(Cu4Cu+2)(Sb2Te2)S12S |
| 2.GB. | Argentotetrahedrite-(Zn) | Ag6(Cu4Zn2)Sb4S12S |
| 2.GB. | Tetrahedrite-(Cd) | Cu6(Cu4Cd2)Sb4S12S |
| 2.GB. | Arsenogoldfieldite | (Cu4Cu2)(Cu4Cu+2)(As2Te2)S12S |
| 2.GB. | Arsenoústalečite | (Cu4Cu2)(Cu4Cu+2)(As2Te2)Se12Se |
| 2.GB. | Tennantite-(In) | Cu6(Cu4(In3+Cu+))As4S12S |
| 2.GB. | Zvěstovite-(Fe) | Ag6(Ag4Fe2+2)As4S12S |
| 2.GB. | Hakite-(Fe) | Cu6(Cu4Fe2+2)Sb4Se12Se |
| 2.GB. | Tennantite-(Cd) | Cu6(Cu4Cd2)As4S12S |
| 2.GB.X | Kenorozhdestvenskayaite-(Fe) | [Ag6]4+(Ag4Fe2+2)Sb4S12◻ |
| 2.GB. | Tetrahedrite-(Cu) | Cu6(Cu4Cu2+2)Sb4S12S |
| 2.GB. | Hakite-(Zn) | Cu6(Cu4Zn2)Sb4Se12Se |
| 2.GB. | Zvěstovite-(Zn) | Ag6(Ag4Zn2)As4S12S |
| 2.GB. | Hakite-(Cd) | Cu6(Cu4Cd2)Sb4Se12Se |
| 2.GB. | Kenoargentotennantite-(Fe) | [Ag6]4+(Cu4Fe2)As4S12◻ |
| 2.GB. | Tennantite-(Hg) | Cu6(Cu4Hg2)As4S12S |
| 2.GB. | Tetrahedrite-(Mn) | Cu6(Cu4Mn2)Sb4S12S |
| 2.GB. | Tennantite-(Ni) | Cu6(Cu4Ni2)As4S12S |
| 2.GB. | Tetrahedrite-(Ni) | Cu6(Cu4Ni2)Sb4S12S |
| 2.GB.05 | Hakite-(Hg) | Cu6(Cu4Hg2)Sb4Se12Se |
| 2.GB.05 | Rozhdestvenskayaite-(Zn) | Ag6(Ag4Zn2)Sb4S12S |
| 2.GB.05 | Argentotennantite-(Zn) | Ag6(Cu4Zn2)As4S12S |
| 2.GB.05 | Argentotennantite-(Fe) | Ag6(Cu4Fe2)As4S12S |
| 2.GB.05 | Freibergite Subgroup | (Ag6,[Ag6]4+)(Cu4 C2+2)Sb4S12S0-1 |
| 2.GB.05 | Tennantite Subgroup | Cu6(Cu4C2+2)As4S12S |
| 2.GB.05 | Tennantite-(Zn) | Cu6(Cu4Zn2)As4S12S |
| 2.GB.05 | Tetrahedrite-(Zn) | Cu6(Cu4Zn2)Sb4S12S |
| 2.GB.05 | Tetrahedrite Subgroup | Cu6(Cu4C2+2)Sb4S12S |
| 2.GB.05 | Tennantite-(Fe) | Cu6(Cu4Fe2+2)As4S12S |
| 2.GB.05 | Tetrahedrite-(Fe) | Cu6(Cu4Fe2+2)Sb4S12S |
| 2.GB.05 | Tetrahedrite-(Hg) | Cu6(Cu4Hg2)Sb4S12S |
| 2.GB.05 | Kenoargentotetrahedrite-(Fe) | [Ag6]4+(Cu4Fe2+2)Sb4S12◻ |
| 2.GB.05 | Giraudite-(Zn) | Cu6(Cu4Zn2)As4Se12Se |
| 2.GB.05 | Argentotetrahedrite-(Fe) | Ag6(Cu4Fe2)Sb4S12S |
| 2.GB.05 | Goldfieldite | (Cu4◻2)(Cu4Cu+2)Te4S12S |
| 2.GB.05 | UM1992-21-S:AgFeSb | Ag6(Ag4Fe2+2)Sb4S12S |
| 2.GB.10 | Selenostephanite | Ag5SbSe4 |
| 2.GB.10 | Stephanite | Ag5SbS4 |
| 2.GB.15 | UM2003-14-S:AgBiFeTe | Ag16FeBiTe3S8 |
| 2.GB.15 | UM1979-17-S:BiCuFe | ~Cu18Fe4BiS16 |
| 2.GB.15 | Pearceite | [Ag6As2S7][Ag9CuS4] |
| 2.GB.15 | Argentopearceite | Ag16As2S11 |
| 2.GB.15 | Cupropolybasite | [Cu6Sb2S7][Ag9CuS4] |
| 2.GB.15 | Fengruiite | [Ag6Sb2S7][Ag9CuS2Te2] |
| 2.GB.15 | Auropearceite | [Ag9AuS4][Ag6As2S7] |
| 2.GB.15 | Selenopolybasite | [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] |
| 2.GB.15 | Polybasite | [Ag6Sb2S7][Ag9CuS4] |
| 2.GB.15 | Auropolybasite | [Ag9AuS4][Ag6Sb2S7] |
| 2.GB.15 | Cupropearceite | [Cu6As2S7][Ag9CuS4] |
| 2.GB.20 | Vorontsovite | (Hg5Cu)Σ6TlAs4S12 |
| 2.GB.20 | Ferrovorontsovite | (Fe5Cu)Σ6TlAs4S12 |
| 2.GB.20 | Galkhaite | (Hg5Cu)CsAs4S12 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Polybasite-Tac
mindat.org URL:
https://www.mindat.org/min-265.html
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References for Polybasite-Tac
Reference List:
Frondel, Clifford (1963) Isodimorphism and the polybasite and pearceite series. American Mineralogist, 48 (5-6) 565-572
Bindi, Luca, Evain, Michel, Menchetti, Silvio (2006) Temperature dependence of the silver distribution in the crystal structure of natural pearceite, (Ag,Cu)16(As,Sb)2S11. Acta Crystallographica Section B Structural Science, 62 (2) 212-219 doi:10.1107/s010876810600108x
Evain, Michel, Bindi, Luca, Menchetti, Silvio (2006) Structural complexity in minerals: twinning, polytypism and disorder in the crystal structure of polybasite, (Ag,Cu)16(Sb,As)2S11. Acta Crystallographica Section B Structural Science, 62 (3) 447-456 doi:10.1107/s010876810600975x
Evain, Michel, Bindi, Luca, Menchetti, Silvio (2006) Structure and phase transition of the Se-rich variety of antimonpearceite, [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]. Acta Crystallographica Section B Structural Science, 62 (5) 768-774 doi:10.1107/s0108768106022798
Bindi, Luca, Evain, Michel, Spry, Paul G., Menchetti, Silvio (2007) The pearceite-polybasite group of minerals: Crystal chemistry and new nomenclature rules. American Mineralogist, 92 (5) 918-925 doi:10.2138/am.2007.2440
Localities for Polybasite-Tac
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Argentina | |
| FERNANDEZ +2 other references |
Bulgaria | |
| Tarkian +1 other reference |
| Petrova et al. (2007) +1 other reference |
China | |
| Song et al. (2025) |
Germany | |
| Walenta (1992) +2 other references |
| Walenta (1992) |
| Walenta (1992) |
| Schnorrer-Köhler (1991) |
Indonesia | |
| Syafrizal +3 other references |
Italy | |
| Digennaro et al. (1974) +1 other reference |
| - (n.d.) |
Japan | |
| SUGAKI et al. (1986) |
| Tharalson +5 other references |
| Yamada (2004) |
Mexico | |
| Amer.Min. (1963) |
| Amer.Min. (1963) | |
| Amer.Min. (1963) |
| Gemmell et al. (1988) +1 other reference |
Morocco | |
| Burniaux et al. (2006) |
Russia | |
| Tolstykh et al. (2022) |
Slovakia | |
| Duda et. all. |
Spain | |
| Revista de minerales (Mars) |
| Pascua et al. (1997) | |
UK | |
| |
USA | |
| Taylor |
| Eckel et al. (1997) |
| Hagni (1984) +2 other references |
| Lasmanis (1995) |
Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany