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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:
3 photos of Pearceite-T2ac associated with RammelsbergiteNiAs2
3 photos of Pearceite-T2ac associated with Nickelskutterudite(Ni,Co,Fe)As3
3 photos of Pearceite-T2ac associated with ProustiteAg3AsS3
3 photos of Pearceite-T2ac associated with RhodochrositeMnCO3

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
5.2.7Argentotennantite-(Zn)Ag6(Cu4Zn2)As4S12SIso. 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
5.2.15Freibergite Subgroup([Ag6]4+,(Ag,Cu)6)((Cu,Ag)4$c2+2)Sb4S12S0-1Iso. 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
5.2.22SelenostephaniteAg5SbSe4Orth.
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

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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
    • Chenzhou
      • Guiyang Co.
        • Baoshan ore field (Baoshan Mine)
Mingjun Yang and Gonghua Tan (1991): Mining Geology 12(2), 118-121
    • Hengyang
      • Changning Co.
        • Shuikoushan ore field
Nanshi Zeng, Eiji Izawa, Yoshinobu Motomura, and Lairen Lai (2000): The Canadian Mineralogist 38, 11-22.
  • Jilin
    • Siping
      • Lishu County
Liyan Zhang and Jigang Tang (1996): Geology and Prospecting 32(3), 23-27
Czech Republic
 
  • Karlovy Vary Region
Jakub Plasil
  • Ústí nad Labem Region
    • Chomutov District
No reference listed
Germany
 
  • Baden-Württemberg
    • Freiburg Region
      • Rottweil
        • Schenkenzell
          • Wittichen
            • Böckelsbach valley
Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
            • Burgfelsen
No reference listed
            • Heubach Valley
No reference listed
    • Karlsruhe Region
      • Freudenstadt
        • Alpirsbach
          • Reinerzau mining district
Walenta, K. (1992) Die Mineralien des Schwarzwaldes und ihre Fundstellan. Christian Weise Verlag, München, 336 pages [in German].
  • Hesse
    • Darmstadt
      • Darmstadt-Dieburg
        • Mühltal
          • Nieder-Beerbach
  • Saxony
    • Mittelsachsen
      • Freiberg
C. Frondel (1963): Isodimorphism of the polybasite and pearceite series.- American Mineralogist 48, 565-572
Indonesia
 
  • West Sumatra Province
Econ Geol (1997) 92:468-484
Italy
 
  • Tuscany
    • Lucca Province
      • 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 Region
    • Rudny
[World of Stones 12:13]
Peru
 
  • Lima
    • Oyon Province
Hyrsl, J., Rosales, Z. (2003) Peruvian Minerals: An Update [Peru]. The Mineralogical Record: 34(3): 241-254.
Russia
 
  • Chukotka Autonomous Okrug
    • Anadyrsky District
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
 
  • Grisons
    • Surselva Region
      • Tujetsch
        • 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.
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 Mining District
        • Wenatchee
          • Squillchuck Creek
Lasmanis, R. (1995): Mineral News: A Compendium of Wenatchee District Mineralogy, Chelan County, Washington, p.6-7
 
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