Polybasite-Tac
A structural variant of Polybasite
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About Polybasite-Tac
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
GUID
(UUID V4):
(UUID V4):
7707ad26-595f-4db0-b9bd-a0df8f7324b8
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)
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:
9 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 |
2 photos of Polybasite-Tac associated with Luzonite | Cu3AsS4 |
1 photo of Polybasite-Tac associated with Rhabdophane-(Ce) | Ce(PO4) · 0.6H2O |
1 photo of Polybasite-Tac associated with Pyrargyrite | Ag3SbS3 |
1 photo of Polybasite-Tac associated with Tetrahedrite Subgroup | Cu6(Cu4C2+2)Sb4S12S |
1 photo of Polybasite-Tac associated with Quartz | SiO2 |
1 photo of Polybasite-Tac associated with Preisingerite | Bi3(AsO4)2O(OH) |
1 photo of Polybasite-Tac associated with Proustite | Ag3AsS3 |
Related Minerals - Strunz-mindat Grouping
2.GB. | Argentotetrahedrite-(Hg) | Ag6(Cu4Hg2)Sb4S12S |
2.GB. | Hakite-(Zn) | Cu6(Cu4Zn2)Sb4Se12Se |
2.GB. | Hakite-(Cd) | Cu6(Cu4Cd2)Sb4Se12Se |
2.GB. | Argentotetrahedrite-(Zn) | Ag6(Cu4Zn2)Sb4S12S |
2.GB. | Pošepnýite | (Cu+3◻3)(Hg2+4Cu+2)Sb4Se12(Se0.5◻0.5) |
2.GB. | Argentopearceite | Ag16As2S11 |
2.GB. | Zvěstovite-(Zn) | Ag6(Ag4Zn2)As4S12S |
2.GB. | Kenoargentotennantite-(Fe) | [Ag6]4+(Cu4Fe2)As4S12◻ |
2.GB. | Tennantite-(Hg) | Cu6(Cu4Hg2)As4S12S |
2.GB. | Kenoargentotetrahedrite-(Zn) | [Ag6]4+(Cu4Zn2)Sb4S12◻ |
2.GB. | Tennantite-(Cu) | Cu6(Cu4Cu2)As4S12S |
2.GB. | Stibiogoldfieldite | (Cu4Cu2)(Cu4Cu+2)(Sb2Te2)S12S |
2.GB. | Tennantite-(Ni) | Cu6(Cu4Ni2)As4S12S |
2.GB. | Tetrahedrite-(Ni) | Cu6(Cu4Ni2)Sb4S12S |
2.GB. | Stibioústalečite | (Cu4Cu2)(Cu4Cu+2)(Sb2Te2)Se12Se |
2.GB. | Arsenogoldfieldite | (Cu4Cu2)(Cu4Cu+2)(As2Te2)S12S |
2.GB. | Tennantite-(In) | Cu6(Cu4(In3+Cu+))As4S12S |
2.GB. | Tennantite-(Cd) | Cu6(Cu4Cd2)As4S12S |
2.GB. | Tetrahedrite-(Mn) | Cu6(Cu4Mn2)Sb4S12S |
2.GB. | Argentopolybasite | [Ag6Sb2S7][Ag9AgS4] |
2.GB.X | Kenorozhdestvenskayaite-(Fe) | [Ag6]4+(Ag4Fe2+2)Sb4S12◻ |
2.GB. | Argentotetrahedrite-(Cd) | Ag6(Cu4Cd2)Sb4S12S |
2.GB. | Tennantite-(Mn) | Cu6(Cu4Mn2)As4S12S |
2.GB. | Zvěstovite-(Fe) | Ag6(Ag4Fe2+2)As4S12S |
2.GB. | Hakite-(Fe) | Cu6(Cu4Fe2+2)Sb4Se12Se |
2.GB. | Tetrahedrite-(Cu) | Cu6(Cu4Cu2+2)Sb4S12S |
2.GB. | Arsenoústalečite | (Cu4Cu2)(Cu4Cu+2)(As2Te2)Se12Se |
2.GB. | Tetrahedrite-(Cd) | Cu6(Cu4Cd2)Sb4S12S |
2.GB.05 | Argentotennantite-(Zn) | Ag6(Cu4Zn2)As4S12S |
2.GB.05 | Freibergite Subgroup | (Ag6,[Ag6]4+)(Cu4 C2+2)Sb4S12S0-1 |
2.GB.05 | Giraudite-(Zn) | Cu6(Cu4Zn2)As4Se12Se |
2.GB.05 | Goldfieldite | (Cu4◻2)(Cu4Cu+2)Te4S12S |
2.GB.05 | Hakite-(Hg) | Cu6(Cu4Hg2)Sb4Se12Se |
2.GB.05 | Tennantite Subgroup | Cu6(Cu4C2+2)As4S12S |
2.GB.05 | Tetrahedrite Subgroup | Cu6(Cu4C2+2)Sb4S12S |
2.GB.05 | Argentotetrahedrite-(Fe) | Ag6(Cu4Fe2)Sb4S12S |
2.GB.05 | Rozhdestvenskayaite-(Zn) | Ag6(Ag4Zn2)Sb4S12S |
2.GB.05 | UM1992-21-S:AgFeSb | Ag6(Ag4Fe2+2)Sb4S12S |
2.GB.05 | Tennantite-(Zn) | Cu6(Cu4Zn2)As4S12S |
2.GB.05 | Tetrahedrite-(Zn) | Cu6(Cu4Zn2)Sb4S12S |
2.GB.05 | Tennantite-(Fe) | Cu6(Cu4Fe2+2)As4S12S |
2.GB.05 | Tetrahedrite-(Fe) | Cu6(Cu4Fe2+2)Sb4S12S |
2.GB.05 | Kenoargentotetrahedrite-(Fe) | [Ag6]4+(Cu4Fe2+2)Sb4S12◻ |
2.GB.05 | Tetrahedrite-(Hg) | Cu6(Cu4Hg2)Sb4S12S |
2.GB.10 | Selenostephanite | Ag5SbSe4 |
2.GB.10 | Stephanite | Ag5SbS4 |
2.GB.15 | Pearceite | [Ag6As2S7][Ag9CuS4] |
2.GB.15 | Polybasite | [Ag6Sb2S7][Ag9CuS4] |
2.GB.15 | UM2003-14-S:AgBiFeTe | Ag16FeBiTe3S8 |
2.GB.15 | Selenopolybasite | [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] |
2.GB.15 | Cupropearceite | [Cu6As2S7][Ag9CuS4] |
2.GB.15 | Cupropolybasite | [Cu6Sb2S7][Ag9CuS4] |
2.GB.15 | UM1979-17-S:BiCuFe | ~Cu18Fe4BiS16 |
2.GB.20 | Galkhaite | (Hg5Cu)CsAs4S12 |
2.GB.20 | Vorontsovite | (Hg5Cu)Σ6TlAs4S12 |
2.GB.20 | Ferrovorontsovite | (Fe5Cu)Σ6TlAs4S12 |
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
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
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 |
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 |
| AA. VV. |
Japan | |
| Tharalson +5 other references |
| Yamada (2004) |
Mexico | |
| Amer.Min. (1963) |
Amer.Min. (1963) | |
| Amer.Min. (1963) |
| Part I et al. (8) +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