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Pearceite-T2ac

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About Pearceite-T2acHide

Colour:
Black
Lustre:
Metallic
Hardness:
2 - 3
Specific Gravity:
6.18 - 6.23
Crystal System:
Trigonal
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-T2acHide

5.2.6

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

Physical Properties of Pearceite-T2acHide

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

Crystallography of Pearceite-T2acHide

Crystal System:
Trigonal
Class (H-M):
3 2 - Trapezohedral
Space Group:
P3 2 1
Cell Parameters:
a = 14.9746(17) Å, c = 11.9982(6) Å
Ratio:
a:c = 1 : 0.801
Unit Cell V:
2,330.01 ų (Calculated from Unit Cell)
Z:
4
Comment:
Data from Bindi et al. (2007).

First Recorded Occurrence of Pearceite-T2acHide

Synonyms of Pearceite-T2acHide

Other Language Names for Pearceite-T2acHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Rammelsbergite3 photos of Pearceite-T2ac associated with Rammelsbergite on mindat.org.
Nickelskutterudite3 photos of Pearceite-T2ac associated with Nickelskutterudite on mindat.org.
Proustite3 photos of Pearceite-T2ac associated with Proustite on mindat.org.
Rhodochrosite3 photos of Pearceite-T2ac associated with Rhodochrosite on mindat.org.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

5.2.1SmithiteAgAsS2Mon. 2/m
5.2.2TrechmanniteAgAsS2Trig.
5.2.3ProustiteAg3AsS3Trig. 3m (3 2/m) : R3c
5.2.4XanthoconiteAg3AsS3Mon. 2/m : B2/b
5.2.5Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]Trig. 3m (3 2/m) : P3m1
5.2.7ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13Iso. 4 3m : I4 3m
5.2.8MiargyriteAgSbS2Mon. 2/m : B2/b
5.2.9PyrargyriteAg3SbS3Trig. 3m : R3c
5.2.10PyrostilpniteAg3SbS3Mon. 2/m : P21/b
5.2.11StephaniteAg5SbS4Orth. mm2 : Cmc21
5.2.12Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]Mon. 2/m : B2/m
5.2.13BillingsleyiteAg7AsS6Iso. 2 3 : P21 3
5.2.14Polybasite-TacTrig. 3m (3 2/m) : P3m1
5.2.15FreibergiteAg6[Cu4Fe2]Sb4S13-xIso. 4 3m : I4 3m
5.2.16AramayoiteAg3Sb2(Bi,Sb)S6Tric. 1 : P1
5.2.17MatilditeAgBiS2Trig. 3m (3 2/m) : P3m1
5.2.18SchapbachiteAg0.4Pb0.2Bi0.4SIso.
5.2.19PavoniteAgBi3S5Mon. 2/m : B2/m
5.2.20ArcubisiteAg6CuBiS4
5.2.21BohdanowicziteAgBiSe2Trig. 3m (3 2/m) : P3m1
5.2.22SelenostephaniteAg5Sb(Se,S)4Orth.
5.2.23Benleonardite[Ag6(Sb,As)2S6Te] [Ag9Cu(S,Te)2Te2]Trig. 3m (3 2/m) : P3m1
5.2.24VolynskiteAgBiTe2Orth.

Other InformationHide

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-T2acHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Frondel, C. (1963) Isodimorphism of the polybasite and pearceite series. American Mineralogist: 48: 565-572.
International Mineralogical Association: Commission on New Minerals and Mineral Names (1967) Mineralogical Magazine: 36: 131-136.
Hall, H.T. (1967) The pearceite and polybasite series. American Mineralogist: 52: 1311-1321.
Bindi, L., Evain, M., Menchetti, S. (2006) Temperature dependence of the silver distribution in the crystal structure of natural pearceite, (Ag,Cu)16(As,Sb)2S11. Acta Crystallographica: B62: 212-219.
Evain, M., Bindi L., Menchetti, S. (2006) Structural complexity in minerals: twinning, polytypism and disorder in the crystal structure of polybasite, (Ag,Cu)16(Sb,As)2S11. Acta Crystallographica: B62: 447-456.
Evain, M., Bindi L., Menchetti, S. (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: B62: 768-774.
Bindi, L., Evain, M., Spry, P.G., Menchetti, S. (2007) The pearceite-polybasite group of minerals: Crystal chemistry and new nomenclature rules. American Mineralogist: 92: 918-925.

Internet Links for Pearceite-T2acHide

Localities for Pearceite-T2acHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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
 
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
Jakub Plasil
  • 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
    • Mittelsachsen
      • Freiberg
C. Frondel (1963): Isodimorphism of the polybasite and pearceite series.- American Mineralogist 48, 565-572
Indonesia
 
  • Sumatra (Sumatera)
    • 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
    • Rudny
[World of Stones 12:13]
Peru
 
  • Lima Department
    • Oyon Province
Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.
Russia
 
  • Chukotka 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) Eckel, E. B.
    • Park Co.
Minerals of Colorado (1997) Eckel, 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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