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Pearceite-T2ac

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System:
Monoclinic
Colour:
Black
Hardness:
2 - 3
Name:
For Richard Pearce (1837-1927), US chemist
A polytype of Pearceite

Pearceite-Polybasite series

The old species "arsenpolybasite" is now classified as the polytypes Pearceite-T2ac or Pearceite-M2a2b2c (redefinition; see Bindi et al., 2007).

Classification of Pearceite-T2ac

5.2.6

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag
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First Recorded Occurrence of Pearceite-T2ac

Year of Discovery:
1963

Physical Properties of Pearceite-T2ac

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Black
Comment:
Dark red in transmitted light
Hardness (Mohs):
2 - 3
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Imperfect od {001}
Fracture:
Irregular/Uneven
Density:
6.18 - 6.23 g/cm3 (Measured)    

Crystallography of Pearceite-T2ac

Crystal System:
Monoclinic

Relationship of Pearceite-T2ac 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]
5.2.7ArgentotennantiteAg6[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
5.2.14Polybasite-Tac
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 Pearceite-T2ac

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 Pearceite-T2ac

Reference List:
Frondel, Clifford (1963): Isodimorphism of the polybasite and pearceite series.- American Mineralogist 48, 565-572.

Mineralogical Magazine (1967): 36: 131.

American Mineralogist (1967): 52: 1311-1321.

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"

Evain, et al., Acta Cryst. B62,768-774(2006), "Structure and phase transition of the Se-rich variety of antimonpearceite".

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, Volume 92, pages 918-925.

Internet Links for Pearceite-T2ac

Localities for Pearceite-T2ac

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.
China
 
  • Hunan Province
    • Chenzhou Prefecture
      • Guiyang Co.
        • Baoshan ore field (Baoshan Mine)
Mingjun Yang and Gonghua Tan (1991): Mining Geology 12(2), 118-121
    • Hengyang Prefecture
      • Changning Co.
        • Shuikoushan ore field
Nanshi Zeng, Eiji Izawa, Yoshinobu Motomura, and Lairen Lai (2000): The Canadian Mineralogist 38, 11-22.
  • Jilin Province (Manchuria; Dongbei Region)
    • Siping Prefecture
      • Lishu Co.
Liyan Zhang and Jigang Tang (1996): Geology and Prospecting 32(3), 23-27
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Ústí Region
      • Krušné Hory Mts (Erzgebirge)
        • Klášterec nad Ohří
No reference listed
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Alpirsbach
        • Reinerzau District
K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
      • Schenkenzell
        • Wittichen
          • Böckelsbach valley
Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
          • Burgfelsen
No reference listed
          • Heubach Valley
No reference listed
  • Hesse
    • Odenwald
      • Mühltal
        • Nieder-Beerbach
  • Saxony
    • Erzgebirge
      • Freiberg District
        • Freiberg
C. Frondel (1963): Isodimorphism of the polybasite and pearceite series.- American Mineralogist 48, 565-572
Indonesia
 
  • Sumatera Island (Sumatra Island)
    • Sumatera Barat Province (West Sumatra Province)
Econ Geol (1997) 92:468-484
Italy
 
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Stazzema
          • Sant'Anna di Stazzema
Menchetti S., 1970. Sulla arsenpolibasite del Canale dell’Angina (Alpi Apuane). Atti Soc. Tosc. Sci. Nat., Mem., 77: 111-122.
Kazakhstan
 
  • Kostanay Province (Qostanay Oblysy; Kostanai Oblast')
    • Rudny
[World of Stones 12:13]
Peru
 
  • Lima Department
    • Oyon Province
Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.
Russia
 
  • Far-Eastern Region
    • Chukotskii Autonomous Okrug
      • Chukchi Peninsula (Chukotka Peninsula; Chukotski Peninsula)
K. A. Novoselov, V. A. Kotlyarov und E. V. Belogub (2010): Silver sulfoselenide from ore of the Valunisty Au-Ag deposit, Chukchi Peninsula. Geology of Ore Deposits 52, 811-814.
Switzerland
 
  • Grischun (Grisons; Graubünden)
    • Vorderrhein Valley
      • Tujetsch (Tavetsch)
        • Curnera Valley
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 52
USA
 
  • Colorado
    • Lake Co.
      • Leadville District
Minerals of Colorado (1997) Eckels, E. B.
    • Park Co.
Minerals of Colorado (1997) Eckels, E. B.
    • Summit Co.
      • Montezuma Area
Minerals of Colorado (1997) Eckel, E. B.
  • 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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