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Pearceite-T2ac

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Bohemia (Böhmen; Boehmen), Czech Republic
© Rob Lavinsky

Show Pearceite-T2ac Photos (7)
Formula:
(Ag,Cu)
 
16
(As,Sb)
 
2
S
 
11
System:TrigonalHardness:3


Pearceite-Polybasite series

The old species "Arsenpolybasite" is now classified as the polytypes Pearceite-T2ac or Pearceite-M2a2b2c (redefinition in 2007).

Classification of Pearceite-T2ac

Strunz 8th edition ID:2/E.05-40

2 : Sulphides
E : Sulphosalts (S : As,Sb,Bi = x), Sulphosalts with predominant Fe and Cu and x = 2.0
05 : Billingsleyite - Polybasite series
Strunz 9th edition ID: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
Dana 8th edition ID:3.1.7.1

3 : SULFOSALTS
1 : ø > 4
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
Hardness (Mohs):3

Crystallography of Pearceite-T2ac

Crystal System:Trigonal
Class (H-M):3 2 - Trapezohedral
Space Group:P3 2 1

Chemical Properties of Pearceite-T2ac

Formula:
(Ag,Cu)
 
16
(As,Sb)
 
2
S
 
11
Essential elements:Ag, As, S
All elements listed in formula:Ag, As, Cu, S, Sb
Common Impurities:Fe

Relationship of Pearceite-T2ac to other Species

Related Minerals - Strunz Grouping):
2/E.05-10Billingsleyite
Ag
 
7
AsS
 
6
2/E.05-20Pearceite
(Ag,Cu)
 
16
(As,Sb)
 
2
S
 
11
2/E.05-30Polybasite-Tac
(Ag,Cu)
 
16
(Sb,As)
 
2
S
 
11
2/E.05-50Polybasite
(Ag,Cu)
 
16
(Sb,As)
 
2
S
 
11
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)
 
16
(As,Sb)
 
2
S
 
11
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)
 
16
(Sb,As)
 
2
S
 
11
5.2.13Billingsleyite
Ag
 
7
AsS
 
6
5.2.14Polybasite-Tac
(Ag,Cu)
 
16
(Sb,As)
 
2
S
 
11
5.2.15Freibergite
(Ag,Cu,Fe)
 
12
(Sb,As)
 
4
S
 
13
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)Arsenpolybasite
German names:
Arsenpolybasit
Russian names:
Пирсеит-T2ac
Spanish names:
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

    Hide Locality List
    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.
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    (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
      • Hengyang Prefecture
        • Changning Co.
          • Shuikoushan ore field
    		Nanshi Zeng, Eiji Izawa, Yoshinobu Motomura, and Lairen Lai (2000): The Canadian Mineralogist 38, 11-22.
    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
        • Nieder-Ramstadt
          • Nieder-Beerbach
    • Saxony
      • Erzgebirge
        • Freiberg District
          • Freiberg
    		C. Frondel (1963): Isodimorphism of the polybasite and pearceite series.- American Mineralogist 48, 565-572
    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
     
    • Qostaney Oblysy (Kostanai [Kustany] Oblast')
      • Rudnyi Altai
    		[World of Stones 12:13]
    Peru
     
    • Lima Department
      • Oyon Province
    		Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.
    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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