Tsumebite Mineral Data

Tsumebite Mineral Data +

General Tsumebite Information

Chemical Formula:

Pb2Cu(PO4)(SO4)(OH)

Composition:

Molecular Weight = 685.99 gm

Copper 9.26 % Cu 11.60 % CuO

Phosphorus 4.52 % P 10.35 % P₂O₅

Hydrogen 0.15 % H 1.31 % H₂O

Lead 60.41 % Pb 65.07 % PbO

Sulfur 4.67 % S 11.67 % SO₃

Oxygen 20.99 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₂Cu(PO₄)(SO₄)(OH)

Environment:

Oxidized zone with other lead-bearing phosphates and sulfates.

IMA Status:

Valid Species (Pre-IMA) 1912

Locality:

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

Name Origin:

Named for the locality.

Synonym:

ICSD 76613

PDF 29-568

Tsumebite Image

Images:

Tsumebite

Comments: Green crystalline aggregates of tsumebite on matrix.
Location: Tsumeb Mine, Tsumeb, Namibia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Tsumebite Crystallography

Axial Ratios:

a:b:c =1.5034:1:1.3598

Cell Dimensions:

a = 8.69, b = 5.78, c = 7.86, Z = 2; beta = 111.87° V = 366.38 Den(Calc)= 6.22

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 3.24(1), 2.9(0.7), 2.27(0.4),2.72(0.4), 2.94(0.4), 4.7(0.3), 3.92(0.2),

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Forms: [ 0 2 1] [ 1 0 1] [ 1 0 0] [ 1 1 0] [ 0 1 1]

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Physical Properties of Tsumebite

Cleavage:

None

Color:

Emerald green.

Diaphaniety:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

green

Optical Properties of Tsumebite

Gladstone-Dale:

CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.148,KC= 0.1503

Optical Data:

Biaxial (+), a=1.885, b=1.92, g=1.956, bire=0.0710, 2V(Calc)=88, 2V(Meas)=90. Dispersion r < v strong.

Pleochroism (x):

faint.

Pleochroism (y):

faint.

Pleochroism (z):

faint.

Calculated Properties of Tsumebite

Electron Density:

r_electron=5.39 gm/cc
note: r_Tsumebite=6.22 gm/cc.

Fermion Index

Fermion Index = 0.13395
Boson Index = 0.86605

Photoelectric:

PE_Tsumebite=1,076.03 barns/electron
U=PE_Tsumebite x r_electron=5,795.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tsumebite is Not Radioactive

Tsumebite Classification

Dana Class:

43.4.2.1 (43)Compound Phosphates, etc.

(43.4)(Anhydrous Compound Anions With Hydroxyl or Halogen)

(43.4.2)Dana Group

43.4.2.1 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 2₁/m 2/m

43.4.2.2 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 2₁/m 2/m

Strunz Class:

VII/B.24-50 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.24 - Brackebuschite - Tsumebite group, Bearthite - Jamesite series

VII/B.24-05 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-10 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-20 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-22 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

VII/B.24-25 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 2₁/m 2/m

VII/B.24-28 Calderonite! Pb2Fe(VO4)2(OH) P 2₁/m 2/m

VII/B.24-30 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-40 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2·(H2O) P 2₁/m 2/m

VII/B.24-45 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2·(H2O) P 2₁,P 2₁/m Mono

VII/B.24-50 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-60 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-65 Lulzacite! Sr2Fe(Fe,Mg)2Al4(PO4)4(OH)10 P1 1

VII/B.24-70 Jamesite Pb2Zn2Fe5(AsO4)5O4 P1 1

Other Tsumebite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Tsumebite

Pb2Cu(PO4)(SO4)(OH)
Dana No: 43.4.2.1 Strunz No: VII/B.24-50
Locality:

Notes: