Pekoite Mineral Data

[Newest Minerals] [Minerals for Sale] [Educational Articles] [About Us] [Image Gallery]
John Betts - Fine Minerals
Classic minerals, out-of-print books & magazines, plus informative articles for collectors

General Pekoite Information

Chemical Formula:

PbCuBi11(S,Se)18

Composition:

Molecular Weight = 3,240.51 gm

Copper 1.96 % Cu

Bismuth 70.94 % Bi

Lead 6.39 % Pb

Selenium 4.87 % Se

Sulfur 15.83 % S

______

100.00 %

Empirical Formula:

PbCuBi₁₁S₁₆Se₂

Environment:

In magnetite pipes that cut felsic sediments and pyroclastics.

IMA Status:

Approved IMA 1976

Locality:

Peko mine, Tennant Creek, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for its locality.

Name Pronunciation:

Pekoite

Synonym:

ICSD 60151

PDF 30-488

Pekoite Image

Images:

Pekoite

Comments: Gray-metallic pekoite disseminated in quartz with chalcopyrite.
Location: Falungruva, Dalarna, Sweden. Scale: Not given.
© Diederik Visser

Pekoite Crystallography

Axial Ratios:

a:b:c =0.3399:1:0.119

Cell Dimensions:

a = 11.472, b = 33.744, c = 4.016, Z = 2; V = 1,554.64 Den(Calc)= 6.92

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P 2₁am

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.14(1), 3.025(0.4), 3.622(0.3),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Mumme W G , Watts J A , The Canadian Mineralogist , 14 (1976) p.322-333, Pekoite, CuPbBi11S18, a new member of the bismuthinite-alkinite mineral series:, its crystal structure and relationship with naturally- and synthetically-formed members, Note: x-coordinate of S18 changed in order to generate reported bond lengths.

Physical Properties of Pekoite

Cleavage:

{010} Good

Color:

Lead gray.

Diaphaneity:

Opaque

Hardness:

2-3 - Gypsum-Calcite

Luster:

Metallic

Streak:

lead gray

Optical Properties of Pekoite

Optical Data:

NCalc= 1.94 - from Gladstone-Dale relationship (KC = 0.1353) where Ncalc=Dcalc*KC+1

RL Color:

White to cream.

Calculated Properties of Pekoite

Electron Density:

Bulk Density (Electron Density)=5.76 gm/cc
note: Specific Gravity of Pekoite =6.92 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Pekoite=1,496.26 barns/electron
U=PE_Pekoite x rElectron Density=8,614.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pekoite is Not Radioactive

Pekoite Classification

Dana Class:

03.04.05.06 (03)Sulfides - Sulfosalts

(03.04)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.04.05)Aikinite Group (Orthorhombic containing Pb, Cu, Bi, & S)

03.04.05.01 Aikinite PbCuBiS3 Pbnm 2/m 2/m 2/m

03.04.05.02 Krupkaite PbCuBi3S6 P mc2₁ mm2

03.04.05.03 Gladite PbCuBi5S9 P nma 2/m 2/m 2/m

03.04.05.04 Hammarite Pb2Cu2Bi4S9(?) Pbnm 2/m 2/m 2/m

03.04.05.05 Friedrichite Pb5Cu5Bi7S18 Pb21m mm2

03.04.05.06 Pekoite PbCuBi11(S,Se)18 P 2₁am mm2

03.04.05.07 Lindstromite Pb3Cu3Bi7S15 Pbnm 2/m 2/m 2/m

03.04.05.08 Salzburgite! Cu1.6Pb1.6Bi6.4S12 P mc2₁ mm2

Strunz Class:

02.HB.05a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HB -With Cu, Ag, Hg, Fe, Sn and Pb

02.HB.05a Aikinite PbCuBiS3 Pbnm 2/m 2/m 2/m

02.HB.05a Hammarite Pb2Cu2Bi4S9(?) Pbnm 2/m 2/m 2/m

02.HB.05a Gladite PbCuBi5S9 P nma 2/m 2/m 2/m

02.HB.05a Friedrichite Pb5Cu5Bi7S18 Pb21m mm2

02.HB.05a Lindstromite Pb3Cu3Bi7S15 Pbnm 2/m 2/m 2/m

02.HB.05a Krupkaite PbCuBi3S6 P mc2₁ mm2

02.HB.05a Pekoite PbCuBi11(S,Se)18 P 2₁am mm2

02.HB.05a Paarite! Cu1.7Pb1.7Bi6.3S12 Pmcn 2/m 2/m 2/m

02.HB.05a Emilite! Cu2.68Pb2.68Bi5.32S12 P mc2₁ mm2

02.HB.05a Salzburgite! Cu1.6Pb1.6Bi6.4S12 P mc2₁ mm2

Other Pekoite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Pekoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Pekoite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Pekoite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Pekoite Mineral Data :

Ask about Pekoite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Pekoite Specimen Label here :

Pekoite

PbCuBi11(S,Se)18
Dana No: 03.04.05.06 Strunz No: 02.HB.05a
Locality:

Notes: