Thometzekite Mineral Data

General Thometzekite Information

Chemical Formula:

Pb(Cu,Zn)2(AsO4)2•2(H2O)

Composition:

Molecular Weight = 649.08 gm

Zinc 5.04 % Zn 6.27 % ZnO

Copper 14.69 % Cu 18.38 % CuO

Arsenic 23.09 % As 35.41 % As₂O₅

Hydrogen 0.62 % H 5.55 % H₂O

Lead 31.92 % Pb 34.39 % PbO

Oxygen 24.65 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbCu_1.5Zn_0.5(AsO₄)₂•2(H₂O)

Environment:

Rare secondary mineral from an oxidized zone in a dolostone-hosted hydrothermal polymetallic ore deposit

IMA Status:

Approved IMA 1985

Locality:

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

Name Origin:

Named for Wilhelm Thometzek, former General Manager of the Tsumeb mining company.

Name Pronunciation:

Thometzekite + Pronunciation

Thometzekite Image

Images:

Thometzekite

Comments: Pale olive-green colored thometzekite crusts on quartz.
Location: Moldovo. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Thometzekite Crystallography

Axial Ratios:

a:b:c =1.4392:1:1.211

Cell Dimensions:

a = 9.112, b = 6.331, c = 7.667, Z = 2; beta = 116.74° V = 394.99 Den(Calc)= 5.46

Crystal System:

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

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

By Intensity(I/I_o): 4.688(1), 3.273(0.88), 2.865(0.7),

Physical Properties of Thometzekite

Color:

Bluish green, Green.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Thometzekite

Gladstone-Dale:

CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1612,KC= 0.1631
Ncalc = 1.89

Optical Data:

Biaxial (+), a=1.85, b=1.87, g=1.92, bire=0.0700, 2V(Calc)=68, 2V(Meas)=70.

Calculated Properties of Thometzekite

Electron Density:

Bulk Density (Electron Density)=4.89 gm/cc
note: Specific Gravity of Thometzekite =5.46 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Thometzekite= 573.77 barns/electron
U=PE_Thometzekite x rElectron Density=2,804.16 barns/cc.

Radioactivity:

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

Thometzekite Classification

Dana Class:

40.02.09.03 (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 Thometzekite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Thometzekite

Pb(Cu,Zn)2(AsO4)2•2(H2O)
Dana No: 40.02.09.03 Strunz No: 08.CG.15
Locality:

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