Tsumcorite Mineral Data

General Tsumcorite Information

Chemical Formula:

PbZnFe++(AsO4)2•(H2O)

Composition:

Molecular Weight = 624.29 gm

Zinc 10.47 % Zn 13.04 % ZnO

Iron 8.95 % Fe 11.51 % FeO

Arsenic 24.00 % As 36.82 % As₂O₅

Hydrogen 0.32 % H 2.89 % H₂O

Lead 33.19 % Pb 35.75 % PbO

Oxygen 23.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbZnFe²⁺(AsO₄)₂•(H₂O)

Environment:

In the oxidized zone associated with other lead arsenates and carbonates. Forms a series with helmutwinklerite and thometzekite.

IMA Status:

Approved IMA 1971

Locality:

Tsumeb mine, Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for the TSUMeb CORporation.

Name Pronunciation:

Tsumcorite + Pronunciation

Synonym:

ICSD 34763

PDF 25-399

Tsumcorite Image

Images:

Tsumcorite

Comments: Yellow tsumcorite crystalline rosettes on matrix.
Location: Tsumeb Mine, Tsumeb, Namibia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Tsumcorite Crystallography

Axial Ratios:

a:b:c =1.4434:1:1.1987

Cell Dimensions:

a = 9.131, b = 6.326, c = 7.583, Z = 2; beta = 115.3° V = 396.00 Den(Calc)= 5.24

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.244(1), 2.863(0.9), 4.663(0.9),

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

Tillmanns E , Gebert W , Acta Crystallographica, Section B , 29 (1973) p.2789-2794, The crystal structure of tsumcorite, a new mineral from the Tsumeb Mine, S.W. Africa, Locality: Tsumeb mine, Namibia, Africa

Physical Properties of Tsumcorite

Color:

Yellow brown, Reddish brown, Lemon.

Density:

5.2

Diaphaneity:

Translucent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

4.5 - Between Fluorite and Apatite

Streak:

yellow

Optical Properties of Tsumcorite

Gladstone-Dale:

CI meas= -0.087 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.079 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1718,KPDmeas= 0.1731,KC= 0.1592
Ncalc = 1.83

Optical Data:

Biaxial (?), b=1.9, 2V(Meas)=90.

Pleochroism (x):

yellow.

Pleochroism (y):

greenish yellow.

Calculated Properties of Tsumcorite

Electron Density:

Bulk Density (Electron Density)=4.67 gm/cc
note: Specific Gravity of Tsumcorite =5.24 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Tsumcorite= 598.06 barns/electron
U=PE_Tsumcorite x rElectron Density=2,791.04 barns/cc.

Radioactivity:

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

Tsumcorite Classification

Dana Class:

40.02.09.01 (40)Hydrated Phosphates, etc

(40.02)where A++ (B++)2 (XO4) · x(H2O)

(40.02.09)Helmutwinklerite Subgroup

40.02.09.01 Tsumcorite PbZnFe(AsO4)2•(H2O) C 2/m 2/m

40.02.09.02 Helmutwinklerite PbZn2(AsO4)2•2(H2O) P1 1

40.02.09.03 Thometzekite Pb(Cu,Zn)2(AsO4)2•2(H2O) C 2/m 2/m

40.02.09.04 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.02.09.05 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O) P1 1

40.02.09.06 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.02.09.07 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.02.09.08 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Strunz Class:

08.CG.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CG -With large and medium-sized cations, RO4:H2O = 1:1

08.CG.15 Cobaltlotharmeyerite! Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Ferrilotharmeyerite Ca(Zn,Cu)(Fe,Zn)(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Cabalzarite! Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2 C 2/m 2/m

08.CG.15 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Lotharmeyerite CaZnMn(AsO3OH)4(OH)3 C 2/m,C 2,Cm Mono

08.CG.15 Mounanaite PbFe2(VO4)2(OH)2 P1 1

08.CG.15 Tsumcorite PbZnFe(AsO4)2•(H2O) C 2/m 2/m

08.CG.15 Thometzekite Pb(Cu,Zn)2(AsO4)2•2(H2O) C 2/m 2/m

08.CG.15 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Nickellotharmeyerite! Ca(Ni,Fe,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m

08.CG.15 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Other Tsumcorite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

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

Search for Tsumcorite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Tsumcorite :

A Bijoux Google Search for Tsumcorite
Adam's Minerals Google Search for Tsumcorite
Cape Minerals Google Search for Tsumcorite
Dakota Matrix Minerals Google Search for Tsumcorite
Excalibur Mineral Corp. Google Search for Tsumcorite
Exceptional Minerals Google Search for Tsumcorite
John Betts Fine Minerals Search for Tsumcorite
McDougall Minerals Google Search for Tsumcorite
Mineral News Website Link
Rock and Mineral Shows Google Search for Tsumcorite
Weinrich Minerals, Inc. Google Search for Tsumcorite

Ask about Tsumcorite 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 Tsumcorite Specimen Label here :

Tsumcorite

PbZnFe++(AsO4)2•(H2O)
Dana No: 40.02.09.01 Strunz No: 08.CG.15
Locality:

Notes: