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 % P2 O5
Hydrogen 0.15 % H 1.31 % H2 O
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:
Pb2 Cu(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.
Name Pronunciation:
Tsumebite + Pronunciation
Synonym:
ICSD 76613
PDF 29-568
Tsumebite Image
Images:
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 - Prismatic H-M Symbol (2/m) Space Group: P 21 /m
X Ray Diffraction:
By Intensity(I/Io ): 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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Physical Properties of Tsumebite
Cleavage:
None
Color:
Emerald green.
Diaphaneity:
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 Ncalc = 1.93
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:
Bulk Density (Electron Density)=5.39 gm/cc note: Specific Gravity of Tsumebite =6.22 gm/cc.
Fermion Index:
Fermion Index = 0.13 Boson Index = 0.87
Photoelectric:
PETsumebite =1,076.03 barns/electronU=PETsumebite x r Electron Density=5,795.39 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tsumebite is Not Radioactive
Tsumebite Classification
Dana Class:
43.04.02.01 (43) Compound Phosphates, etc.
(43.04) (Anhydrous Compound Anions With Hydroxyl or Halogen)
(43.04.02) Tsumebite Group
43.04.02.01 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 21 /m 2/m
43.04.02.02 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 21 /m 2/m
Strunz Class:
08.BG.05 08 - PHOSPHATES, ARSENATES, VANADATES
08.B - Phosphates, etc. with Additional Anions, without H2O
08.BG -With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
08.BG.05 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2•(H2O) P 21 /m 2/m
08.BG.05 Bearthite Ca2Al(PO4)2(OH) P 21 /m 2/m
08.BG.05 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 21 /m 2/m
08.BG.05 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 21 /m 2/m
08.BG.05 Feinglosite ! Pb2(Zn,Fe)[(As,S)O4]2•(H2O) P 21 ,P 21 /m Mono
08.BG.05 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 21 /m 2/m
08.BG.05 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 21 /m 2/m
08.BG.05 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 21 /m 2/m
08.BG.05 Calderonite ! Pb2Fe(VO4)2(OH) P 21 /m 2/m
08.BG.05 Bushmakinite ! Pb2Al(PO4)(VO4)(OH) P 21 /m 2/m
08.BG.05 Tokyoite ! Ba2Mn(VO4)2(OH) P 21 /m 2/m
Other Tsumebite Information
References:
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
See Also:
Links to other databases for Tsumebite :
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
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Tsumebite
Pb2Cu(PO4)(SO4)(OH)
Dana No: 43.04.02.01 Strunz No: 08.BG.05
Locality:
Notes:
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