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Pekoite (Pekoit)

Pictures (2 Images total)

Pekoit
Views (File:
1222701329
): 1205
Pekoit
Fo.: Comstock Mine, Cochise Co., Arizona, USA, blockige, messinggelber Kristall, BB 1,0mm
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A012678, Donator: Melanie Albert
Location: USA/Arizona/Cochise Co./Dos Cabezas Mts./Comstock Mine
Mineral: Pekoite
Image: 1222701329
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Pekoit (SNr: A012678)

Fo.: Comstock Mine, Cochise Co., Arizona, USA, blockige, messinggelber Kristall, BB 1,0mm
Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2008-09-29
Locality: Comstock Mine / Dos Cabezas Mts. / Cochise Co. / Arizona / USA
Pekoit
Views (File:
1184057013
): 1452
Pekoit
bleigrau in Matrix, Bildmitte; Fundort: Falungruva, Darlana, Schweden; Größe bzw. Bildausschnitt: etwa 4 mm
Copyright: rtbstone; Contribution: rtbstone
Collection: rtbstone
Location: Schweden/Dalarna, Provinz/Falun/Falu Gruva
Mineral: Pekoite
Image: 1184057013
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Pekoit

bleigrau in Matrix, Bildmitte; Fundort: Falungruva, Darlana, Schweden; Größe bzw. Bildausschnitt: etwa 4 mm
Collection: rtbstone
Copyright: rtbstone
Contribution: rtbstone 2007-07-10
Locality: Falu Gruva / Falun / Dalarna, Provinz / Schweden

You find additional Pekoit specimen at the Geolitho Museum

Collectors Summary

Color bleigrau-met.
Streak color bleigrau
Hardness (Mohs) 2.5
Solubility +++ HNO3
Crystal System orthorhombisch, P21am

Chemism

Chemical formula

PbCuBi11(S,Se)18

Chemical composition

Bismut, Blei, Kupfer, Selen, Schwefel

Unit weight: 3357.758252 u; Number of atoms in the formula: 31

Info

Empirical formula:

PbCuBi11(S0.75Se0.25)18

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Sulfur

S

12.89

13.5

43.55

32.0655000

432.8842500
Copper

Cu

1.89

1

3.23

63.5463000

63.5463000
Selenium

Se

10.58

4.5

14.52

78.9630000

355.3335000
Lead

Pb

6.17

1

3.23

207.2100000

207.2100000
Bismuth

Bi

68.46

11

35.48

208.9803820

2,298.7842020

Analysis wt%

Bi : 73.60, Pb : 5.10, Cu : 1.30, S : 14.30, Se : 7.40 (Ref: Canadian Mineralogist 76)

Strunz 9th edition incl. updates

2.HB.05

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
H: Sulfosalze mit SnS als Vorbild
B: Mit Cu, Ag, Fe, Sn und Pb
05:Meneghinit-Serie

Lapis Classification

II/E.30-070

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
E: Sulfosalze (S : As,Sb,Bi = x)
30: Blei-Sulfosalze mit Wismut (x= 6,0 - 1,6); Aikinit-Reihe

Classification by Hölzel

2.GB.125

2: SULFIDES
G: SnS Archetype
B: With Cu,Ag,Fe and Pb
1: Meneghinite Series

Dana 8th edition

03.04.05.06

03: Sulfides - Sulfosalts
04: Sulfides - Sulfosalts where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
05: Aikinite Group (Orthorhombic containing Pb, Cu, Bi, & S)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

bleigrau-met.

Streak color

bleigrau

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mm2

Space Group number

26

Space Group

P21am

Cell parameters a (Å)

33.744

Cell parameters b (Å)

11.472

Cell parameters c (Å)

4.016

Cell parameters a/b or c/a

2.941

Cell parameters c/b

0.350

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volumne (ų)

1554.638

X-Ray Powder Diffraction

3.622(30),
3.593(20),
3.564(20),
3.140(100),
3.025(40),
2.333(20),
2.137(20),
1.971(30)
XRD chart Pekoite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

2.5

VHN (Hardness Vickers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

7.12 (berechnet)

7.173 ( ρ calc. Mineralienatlas )

Instability

+++ HNO3

(Co-)Type locality

(Co-)Type locality

Australien/Northern Territory/Barkly Region, LGA/Tennant Creek/Juno Mine

Preface

Author (Name, Year)

Mumme & Watts, 1976

References

Canadian Mineralogist 14 (1976), 322

Other languages

German

Pekoit

English

Pekoite

French

Pekoite

Spanish

Pekoíta

Russian

Пекоит

Simplified Chinese

硒铋铜铅矿

CNMNC (IMA)-Number

IMA 1975-014

CNMNC symbol

Symbol

Pek

Locations with GPS information