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Polybasite-Tac

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System:
Monoclinic
Colour:
Black
Hardness:
3
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).

Classification of Polybasite-Tac

Redefined Approved 2006
5.2.14

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag
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Occurrences of Polybasite-Tac

Geological Setting:
Epithermal precious metal deposits

Physical Properties of Polybasite-Tac

Sub-Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Black
Streak:
Black
Hardness (Mohs):
3
Tenacity:
Brittle
Density:
6.33 - 6.35 g/cm3 (Measured)    6.40 g/cm3 (Calculated)

Crystallography of Polybasite-Tac

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Space Group Setting:
C2/m
Morphology:
Thin tabular pseudohexagonal
Twinning:
On {110}

Relationship of Polybasite-Tac to other Species

5.2.1SmithiteAgAsS2
5.2.2TrechmanniteAgAsS2
5.2.3ProustiteAg3AsS3
5.2.4XanthoconiteAg3AsS3
5.2.5Pearceite[(Ag,Cu)6(As,Sb)2S7][Ag9CuS4]
5.2.6Pearceite-T2ac
5.2.7ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13
5.2.8MiargyriteAgSbS2
5.2.9PyrargyriteAg3SbS3
5.2.10PyrostilpniteAg3SbS3
5.2.11StephaniteAg5SbS4
5.2.12Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
5.2.13BillingsleyiteAg7AsS6
5.2.15FreibergiteAg6[Cu4Fe2]Sb4S13-x
5.2.16AramayoiteAg(Sb,Bi)S2
5.2.17MatilditeAgBiS2
5.2.18SchapbachiteAg0.4Pb0.2Bi0.4S
5.2.19Pavonite(Ag,Cu)(Bi,Pb)3S5
5.2.20ArcubisiteAg6CuBiS4
5.2.21BohdanowicziteAgBiSe2
5.2.22SelenostephaniteAg5Sb(Se,S)4
5.2.23BenleonarditeAg8(Sb,As)Te2S3
5.2.24VolynskiteAgBiTe2

Other Names for Polybasite-Tac

Name in Other Languages:

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.

References for Polybasite-Tac

Reference List:
American Mineralogist: 48: 565-572.

American Mineralogist: 50: 1507.

M. Evain, L. Bindi and S. Menchetti (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 Cryst. B62, 768-774.

Bindi et al., Acta Cryst. B62, 212-219 (2006), "Temperature dependence of the silver distribution in the crystal structure of natural pearceite"

Evain et al., Acta Cryst. B62, 447-456 (2006), "Structural complexity in minerals: twinning, polytypism and disorder in the crystal structure of polybasite"

Bindi, Luca, Michel Evain, Paul G. Spry, and Silvio Menchett (2007) The pearceite-polybasite group of minerals: Crystal chemistry and new nomenclature rules. American Mineralogist, 92, 918-925.

Marquez-Zavalia, M.F. et al. (2008): Mineral. Petrol. 94, 145-150.

Internet Links for Polybasite-Tac

Localities for Polybasite-Tac

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Argentina
 
  • Santa Cruz
    • Macizo del Deseado
Marquez-Zavalia, M.F. et al. (2008): Mineral. Petrol. 94, 145-150.; FERNANDEZ, Raúl R. et al. Gold and silver deposits related to Jurassic Patagonian volcanism: review and perspectives for exploration. Rev. Asoc. Geol. Argent. [online]. 2008, vol.63, n.4, pp. 665-681.
Bulgaria
 
  • Montana Oblast
    • Chiprovtsi Obshtina
Petrova, M., & Ilieev, T. (2007). Compositional variations in the tetrahedrite-tennantite fahlores and polybasite-pearceite series from the Chiprovtsi Ag-Pb deposit, northwestern Bulgaria. Au-Ag telluride-selenide deposits, 26, 39.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • St Blasien
        • Urberg
Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
      • Wolfach
        • Oberwolfach
          • Frohnbach valley
K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
          • Rankach valley
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German); KOLITSCH, U., GRÖBNER, J. & BAYERL, R. (1995): Die Mineralien der Silber-Antimon-Vererzungen der Grube Clara im Zeitraum 1993 bis 1995. - Erzgräber 9 (2), 61-77. ; Wendel, G. (2006): Antimonpearceite aus der Grube Clara, Oberwolfach. LAPIS 31 (2), 36-37
  • Rhineland-Palatinate
    • Siegerland
      • Niederfischbach
Schnorrer-Köhler, G. (1991): Mineralogische Notizen V, Der Aufschluss, Vol. 42, 155-171
Indonesia
 
  • Jawa Island (Java Island)
    • Jawa Barat Province (West Java Province)
      • Bogor District
Syafrizal; Imai, A.; Motomura, Y.; Watanabe, K. (2005): Characteristics of gold mineralization at the Ciurug vein, Pongkor gold-silver deposit, West Java, Indonesia. Resource Geology 55, 225-238.
Italy
 
  • Sardinia
    • Cagliari Province
      • Burcei
Stara, P., Rizzo, R., Brizzi G., (1993): Sarrabus Miniere e Minerali. Edito a cura dell'EMSA e "varie associazioni mineralogiche", 208 pp.
      • San Vito
AA. VV., 1996. Collezionare minerali. Hobby & Work.
Japan
 
  • Honshu Island
    • Chubu Region
      • Shizuoka Prefecture
        • Toi-cho
Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
Mexico
 
  • Guanajuato
Amer.Min.(1963) 48, 565-572
Amer.Min.(1963) 48, 565-572
    • Mun. de Arizpe
      • Arizpe
Amer.Min.(1963) 48, 565-572
Morocco
 
  • Souss-Massa-Draâ Region
    • Ouarzazate Province
      • Djebel Saghro (Jbel Saghro)
        • Imiter District
Burniaux, P. and Williams-Jones, A.E., (2006) Controls Of Silver-Mercury Mineralization At Imiter, Morocco. in Geological Association of Canada, Program with Abstracts Volume 3
Slovakia
 
  • Prešov Region
    • Prešov Co.
Duda et. all.,1981:Minerály severnej časti Slanských vrchov. Min.Slovca,Monografia 2,Bratislava, 98 p
Spain
 
  • Castile and Leon
    • Salamanca
Revista de minerales, 2000 (Mars), 260-263.
UK
 
  • England
    • Cornwall
      • Wadebridge District
        • St Minver
No reference listed
USA
 
  • Alaska
    • Juneau Borough
      • Admiralty District
Taylor, C.D., and Johnson, C.A., editors, 2010, Geology, geochemistry, and genesis of the Greens Creek massive sulfide deposit, Admiralty Island, southeastern Alaska: U.S. Geological Survey Professional Paper 1763, 429 p., 7 plates on CD.
  • Colorado
    • Clear Creek Co.
Minerals of Colorado (1997) Eckels, E. B.
  • Missouri
    • Madison Co.
      • Fredericktown District
R&M 73:2 pp 98-117
  • Washington
    • Chelan Co.
      • Wenatchee District
        • Wenatchee
          • Squillchuck Creek
Lasmanis, R. (1995): Mineral News: A Compendium of Wenatchee District Mineralogy, Chelan County, Washington, p.6-7
Mineral and/or Locality  
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