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Pearceite-Tac (Pearceit)

Pictures (17 Images total)

Pearceit-Tac
Views (File:
1285405027
): 3260
Pearceit-Tac
Bildbreite: 3 mm; Fundort: Sarbai Mine, Rudny, Qostaney Oblast, Kasachstan
Copyright: Dominik Schläfli; Contribution: Philip Blümner
Location: Kasachstan/Qostanay oblysy (Qostanai; Kustany)/Sokolov-Sarbai/Rudny/Sarbai Mine
Mineral: Pearceite-Tac
Image: 1285405027
Rating: 7.33 (votes: 3)
License: Usage for Mineralienatlas project only
Pearceit-Tac

Bildbreite: 3 mm; Fundort: Sarbai Mine, Rudny, Qostaney Oblast, Kasachstan
Copyright: Dominik Schläfli
Contribution: Philip Blümner 2010-09-25
Locality: Sarbai Mine / Rudny / Sokolov-Sarbai / Qostanay oblysy (Qostanai; Kustany) / Kasachstan
Pearceit-Tac
Views (File:
1219772050
): 2308
Pearceit-Tac
Mollie Gibson Mine, Aspen, Pitkin Co., Colorado, USA. Typlokalität. Gestreifte xx bis 6 mm
Copyright: Peter Haas; Contribution: Collector
Collection: Peter Haas
Location: USA/Colorado/Pitkin County/Aspen District/Mollie Gibson Mine
Mineral: Pearceite-Tac
Image: 1219772050
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Pearceit-Tac

Mollie Gibson Mine, Aspen, Pitkin Co., Colorado, USA. Typlokalität. Gestreifte xx bis 6 mm
Collection: Peter Haas
Copyright: Peter Haas
Contribution: Collector 2008-08-26
Locality: Mollie Gibson Mine / Aspen District / Pitkin County / Colorado / USA
Pearceit-Tac
Views (File:
1259941135
): 2060
Pearceit-Tac
Größe: 4,5 x 3,6 x 2,2 cm, Fundort: Guanajuato, Mexiko.
Copyright: Rob Lavinsky; Contribution: thdun5
Location: Mexiko/Guanajuato/Guanajuato, Municipio/Guanajuato
Mineral: Pearceite-Tac
Image: 1259941135
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Pearceit-Tac

Größe: 4,5 x 3,6 x 2,2 cm, Fundort: Guanajuato, Mexiko.
Copyright: Rob Lavinsky
Contribution: thdun5 2009-12-04
Locality: Guanajuato / Guanajuato, Municipio / Guanajuato / Mexiko
Pearceit-Tac
Views (File:
1258287329
): 1282
Pearceit-Tac
Größe: 2,5 x 2 x 1,3 cm, Fundort: Guanajuato, Mexiko.
Copyright: Rob Lavinsky; Contribution: thdun5
Location: Mexiko/Guanajuato/Guanajuato, Municipio/Guanajuato
Mineral: Pearceite-Tac
Image: 1258287329
License: Usage for Mineralienatlas project only
Pearceit-Tac

Größe: 2,5 x 2 x 1,3 cm, Fundort: Guanajuato, Mexiko.
Copyright: Rob Lavinsky
Contribution: thdun5 2009-11-15
Locality: Guanajuato / Guanajuato, Municipio / Guanajuato / Mexiko
Pearceit-Tac
Views (File:
1259941727
): 800
Pearceit-Tac
Größe: 3,6 x 1,2 x 1,2 cm, Fundort: Neihart, Cascade Co., Montana, USA.
Copyright: Rob Lavinsky; Contribution: thdun5
Location: USA/Montana/Cascade County/Neihart District (Montana District)/Neihart
Mineral: Pearceite-Tac
Image: 1259941727
License: Usage for Mineralienatlas project only
Pearceit-Tac

Größe: 3,6 x 1,2 x 1,2 cm, Fundort: Neihart, Cascade Co., Montana, USA.
Copyright: Rob Lavinsky
Contribution: thdun5 2009-12-04
Locality: Neihart / Neihart District (Montana District) / Cascade County / Montana / USA

You find additional specimen at the Geolitho Museum

Collectors Summary

Color schwarz
Streak color rötlich schwarz
Lustre Metallglanz
Solubility +++ HNO3
Crystal System trigonal, P3m1

Additional information / Summary

Es sind mehrere Polytypen bekannt

Chemism

Chemical formula

[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]

Additional chem. information

As > Sb – Zelleinheiten Typ 111 – alter Name: Pearceit

Chemical composition

Antimon, Arsen, Kupfer, Silber, Schwefel

Unit weight: 2141.069673 u; Number of atoms in the formula: 29

Info

Empirical formula:

[Ag9CuS4][(Ag0.75Cu0.25)6(As0.75Sb0.25)2S7]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Sulfur

S

16.47

11

37.93

32.0655000

352.7205000
Copper

Cu

7.42

2.5

8.62

63.5463000

158.8657500
Arsenic

As

5.25

1.5

5.17

74.9216020

112.3824030
Silver

Ag

68.01

13.5

46.55

107.8682200

1,456.2209700
Antimony

Sb

2.84

0.5

1.72

121.7601000

60.8800500

Analysis wt%

Ag : 56.90, Cu : 14.85, As : 7.01, S : 18.13, Zn : 2.81 (Ref: Dana, 7th ed. 1)

Strunz 9th edition incl. updates

2.GB.15

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfoarsenide, Sulfoantimonide, Sulfobismuthide)
G: Sulfoarsenide, Sulfoantimonide, Sulfobismuthide
B: Insel(Neso)-Sulfarsenide, usw., mit zusätzlichen Schwefel (S)
15:Pearceit-Polybasit-Gruppe

Lapis Classification

II/E.05-020

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
E: Sulfosalze (S : As,Sb,Bi = x)
5: Sulfosalze mit Silber vorherrschend (x=6,0 - 1,6)

Classification by Hölzel

2.GA.300

2: SULFIDES
G: SnS Archetype
A: With Cu,Ag,Fe (without Pb)
3: Pearceite-Polybasite-Group

Dana 8th edition

03.01.08.01

03: Sulfides - Sulfosalts
01: Sulfides - Sulfosalts where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
08: Pearceite group

IMA status

erst pre IMA vor 1959, jetzt anerkannt und umbenannt von "Pearceit" in Pearceit-Tac 09/2006

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Pearceite-Polybasite group

Optical Properties

Color

schwarz

Streak color

rötlich schwarz

Change in color

in reflektiertem Licht weiß, mit sehr dunkelrot internen Reflektionen

Diaphaneity (Transparency)

opak bis teilweise durchscheinend

Lustre

Metallglanz

Pleochroism

sehr schwach

Anisotropism

mäßig

Reflectivity: (Lambda nm) ↓, ↑, Ø

(470) 32.0, 33.60, 32.8
(546) 29.1, 32.20, 30.7
(589) 29.0, 31.40, 30.2
(650) 28.8, 29.95, 29.4
Reflection chart Pearceite-Tac

Reflectivity Ø

30.76

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

164

Space Group

P3m1

Cell parameters a (Å)

7.388

Cell parameters b (Å)

-

Cell parameters c (Å)

11.888

Cell parameters a/b or c/a

1.609

Cell parameters c/b

-

Z

1

Volume (ų)

561.944

X-Ray Powder Diffraction

Polytypes

Pearceite-M2a2b2c

[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]

monoklin

C2/c

2/m

Pearceite-T2ac

[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]

trigonal

P321

32

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

VHN (Hardness Vickers)

137 (100g)

Density (g/cm³)

6.15 (gemessen) 6.2 (berechnet)

6.326 ( ρ calc. Mineralienatlas )

Instability

+++ HNO3

(Co-)Type locality

(Co-)Type locality

USA/Colorado/Pitkin County/Aspen District/Mollie Gibson Mine

Preface

Author (Name, Year)

Penfield (1896)

References

Luca Bindi, Michel Evain, Paul G. Spry, and Silvio Menchetti - The pearceite-polybasite group of minerals: Crystal chemistry and new nomenclature rules. American Mineralogist 92 (2007), 918-925.

American Mineralogist 52 (1967), 1311

American Mineralogist 48 (1963), 565

Mineralogical Magazine 28 (1947), 1

Rose Ann. Phys. 28 (1833), 158

Pearce and Penfield - American Journal of Science 44 (1892), 17

Penfield - American Journal of Science 2 (1896) 17

Palache, Charles, Harry Berman & Clifford Frondel - The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged (1944), 353-355.

Harlov, D.E. - Thermochemistry of Ag-Cu exchange equilibria between proustite, sinnerite, and pearceite; constraints on Ag-Cu and As-Sb mixing in pyrargyrite-proustite. European Journal of Mineralogy 11 (1999), 709-719

Welberry, T. R. & Pasciak, M. - Monte Carlo and molecular dynamics simulation of disorder in the Ag+ fast ion conductors pearceite and polybasite. Metallurgical and Materials Transactions A42 (2011), 6-13

IMA group assignments

 
Pearceite-Polybasite group
 
 
 

 
 
Argentopearceite
Ag16As2S11
trigonal
P321

 
 
Argentopolybasite-T2ac
Ag16Sb2S11
trigonal
P321

 
 
Auropearceite
[Ag9AuS4][Ag6As2S7]
trigonal
P321

 
 
Auropolybasite
[Ag9AuS4][Ag6Sb2S7]
trigonal
P321

 
 
Benleonardite
Ag15Cu(Sb,As)2S7Te4
tetragonal
 

 
 
Cupropearceite
[Cu6As2S7][Ag9CuS4]
trigonal
P3m1

 
 
Cupropolybasite
[Cu6Sb2S7][Ag9CuS4]
trigonal
P3m1

 
 
Pearceite-Tac
[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
trigonal
P3m1

 
 
Pearceite-T2ac
[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
trigonal
P321

 
 
Polybasite
(Ag,Cu)16Sb2S11
 
 

 
 
Polybasite-Tac
[Ag9CuS4][(Ag,Cu)6(Sb,As)2S7]
trigonal
P3m1

 
 
Polybasite-T2ac
[Ag9CuS4][(Ag,Cu)6(Sb,As)2S7]
trigonal
P321

 
 
Selenopolybasite
[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]
trigonal
P3m1

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Actuality: 07. May 2025 - 06:34:09

Other languages

German

Pearceit-Tac

English

Pearceite-Tac

French

Pearceite-Tac

Spanish

Pearceíta-Tac

Russian

Пирсеит

Russian

Пирсеит-Tac

Simplified Chinese

砷硫铜银矿

Simplified Chinese

硫砷铜银矿

Japanese

ﾋﾟｱｽ鉱

old name

German

Pearceit

umbenannt in Pearceit-Tac

IMA 09/2006, Antrag 06-A

English

Pearceite

Renamed to Pearceit-Tac

IMA 09/2006, Draft 06-A

Alternative Name

Spanish

Pearceita

Pirseite

Simplified Chinese

砷硫银矿

CNMNC symbol

Symbol

Pea

Locations with GPS information

IDs

GUSID (Global unique identifier short form) IwYTd6Zin02U62CEc7rrRg
GUID (Global unique identifier) 77130623-62A6-4D9F-94EB-608473BAEB46
Database ID 2973