Tsumcorite Mineral Data

Tsumcorite Mineral Data +

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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.

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:

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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

Diaphaniety:

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

Optical Data:

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

Pleochroism (x):

yellow.

Pleochroism (y):

greenish yellow.

Calculated Properties of Tsumcorite

Electron Density:

r_electron=4.67 gm/cc
note: r_Tsumcorite=5.24 gm/cc.

Fermion Index

Fermion Index = 0.07965
Boson Index = 0.92035

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tsumcorite is Not Radioactive

Tsumcorite Classification

Dana Class:

40.2.9.1 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.9)Helmutwinklerite Subgroup

40.2.9.1 Tsumcorite PbZnFe(AsO4)2·(H2O) C 2/m 2/m

40.2.9.2 Helmutwinklerite PbZn2(AsO4)2·2(H2O) P1 1

40.2.9.3 Thometzekite Pb(Cu,Zn)2(AsO4)2·2(H2O) C 2/m 2/m

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

40.2.9.5 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2·2(H2O) P1 1

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

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

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

Strunz Class:

VII/C.31-50 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.31 - Mawbyite - Gartrellite series

VII/C.31-02 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-04 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-05 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-06 Cabalzarite! Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2 C 2/m 2/m

VII/C.31-08 Nickellotharmeyerite! Ca(Ni,Fe,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-10 Ferrilotharmeyerite Ca(Zn,Cu)(Fe,Zn)(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-20 Lotharmeyerite CaZnMn(AsO3OH)4(OH)3 C 2/m,C 2,Cm Mono

VII/C.31-30 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-35 Cobaltlotharmeyerite! Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-36 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-40 Thometzekite Pb(Cu,Zn)2(AsO4)2·2(H2O) C 2/m 2/m

VII/C.31-50 Tsumcorite PbZnFe(AsO4)2·(H2O) C 2/m 2/m

VII/C.31-74 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m

VII/C.31-78 Lukrahnite! Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2 P1 1

VII/C.31-80 Phosphogartrellite! PbCuFe(PO4)2(OH,H2O)2 P1 1

VII/C.31-90 Gartrellite Pb(Cu,Fe)2(AsO4,SO4)2(CO3,H2O)0.7 P1,P 1 Tri

VII/C.31-92 Zincgartrellite! Pb(Zn,Fe,Cu)2(AsO4)2(OH,H2O)2 P1 1

VII/C.31-98 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2·2(H2O) P1 1

VII/C.31-100 Helmutwinklerite PbZn2(AsO4)2·2(H2O) P1 1

Other Tsumcorite Information

References:

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

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Tsumcorite

PbZnFe++(AsO4)2·(H2O)
Dana No: 40.2.9.1 Strunz No: VII/C.31-50
Locality:

Notes: