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Pearceite-T2ac

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Měděnec (Kupferberg), Klášterec nad Ohří, Krušné Hory Mts (Erzgebirge), Ústí Region, Bohemia (Böhmen; Boehmen), Czech Republic
© Rob Lavinsky

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Colour:BlackHardness: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

Hey's CIM Ref.: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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Type Occurrence of Pearceite-T2ac

Type Locality:Neuer Morgenstern Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany
Year of Discovery:1963

Physical Properties of Pearceite-T2ac

Lustre: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 (measured):6.18 - 6.23 g/cm3

Relationship of Pearceite-T2ac to other Species

Related Minerals - Hey's Index Grouping:

- +
5.2.1Smithite
AgAsS
 
2
5.2.2Trechmannite
AgAsS
 
2
5.2.3Proustite
Ag
 
3
AsS
 
3
5.2.4Xanthoconite
Ag
 
3
AsS
 
3
5.2.5Pearceite
[(Ag,Cu)
 
6
(As,Sb)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
5.2.7Argentotennantite
(Ag,Cu)
 
10
(Zn,Fe)
 
2
(As,Sb)
 
4
S
 
13
5.2.8Miargyrite
AgSbS
 
2
5.2.9Pyrargyrite
Ag
 
3
SbS
 
3
5.2.10Pyrostilpnite
Ag
 
3
SbS
 
3
5.2.11Stephanite
Ag
 
5
SbS
 
4
5.2.12Polybasite
[(Ag,Cu)
 
6
(Sb,As)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
5.2.13Billingsleyite
Ag
 
7
AsS
 
6
5.2.14Polybasite-Tac
5.2.15Freibergite
(Ag
 
4+2x
Cu
 
2-2x
)[(Cu, Ag)
 
4
(Fe, Zn)
 
2
]Sb
 
4
S
 
12
S
 
1-x
 (0 < x < 1)
5.2.16Aramayoite
Ag(Sb,Bi)S
 
2
5.2.17Matildite
AgBiS
 
2
5.2.18Schapbachite
AgBiS
 
2
5.2.19Pavonite
(Ag,Cu)(Bi,Pb)
 
3
S
 
5
5.2.20Arcubisite
Ag
 
6
CuBiS
 
4
5.2.21Bohdanowiczite
AgBiSe
 
2
5.2.22Selenostephanite
Ag
 
5
Sb(Se,S)
 
4
5.2.23Benleonardite
Ag
 
8
(Sb,As)Te
 
2
S
 
3
5.2.24Volynskite
AgBiTe
 
2

Other Names for Pearceite-T2ac

Synonyms:
Arsenopolybasite (of Frondel)
Other Languages:
German:Arsenpolybasit
Russian:Пирсеит-T2ac
Spanish:Arsenpolybasita

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 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

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    • Localities for Pearceite-T2ac

    The 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.
    Hide Locality List
    (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.
    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')
    		[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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    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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