Tsumcorite (original) (raw)
A valid IMA mineral species
About TsumcoriteHide
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Formula:
PbZn2(AsO4)2 · 2H2O
May contain minor Fe3+ replacing Zn.
Colour:
Yellow-brown, red-brown, orange
Crystal System:
Monoclinic
Name:
Named after its type locality, the Tsumeb Corporation (Tsumcor) mine, Tsumeb, Namibia
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:4039:2
IMA Classification of TsumcoriteHide
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Type description reference:
Classification of TsumcoriteHide
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8.CG.15
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
40.2.9.1
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
20.5.14
20 : Arsenates (also arsenates with phosphate, but without other anions)
5 : Arsenates of Ti and Pb
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Tmc | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of TsumcoriteHide
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Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Sorry, your browser doesn't support HTML5 audio. | Debbie Woolf | United Kingdom |
Physical Properties of TsumcoriteHide
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Colour:
Yellow-brown, red-brown, orange
Cleavage:
Distinct/Good
{001}, good.
Density:
5.2 g/cm3 (Measured) 5.39 g/cm3 (Calculated)
Optical Data of TsumcoriteHide
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RI values:
_n_α = 1.870 - 1.910 _n_β = 1.890 - 1.930 _n_γ = 1.920 - 1.960
δ = 0.050
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Thickness: 30 µm
Dispersion:
dispersion not observed
Comments:
X = Z = pale yellow; Y = yellow.
Chemistry of TsumcoriteHide
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Mindat Formula:
PbZn2(AsO4)2 · 2H2O
May contain minor Fe3+ replacing Zn.
Element Weights:
| Element | % weight |
|---|---|
| Pb | 31.788 % |
| O | 24.545 % |
| As | 22.988 % |
| Zn | 20.061 % |
| H | 0.619 % |
Calculated from ideal end-member formula.
Crystallography of TsumcoriteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 9.124 Å, b = 6.329 Å, c = 7.577 Å
β = 115.3°
Ratio:
a:b:c = 1.442 : 1 : 1.197
Unit Cell V:
395.57 ų (Calculated from Unit Cell)
Twinning:
Common, on a unknown law
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0009499 | Tsumcorite | Tillmanns E, Gebert W (1973) The crystal structure of tsumcorite, a new mineral from the Tsumeb Mine, S.W. Africa Acta Crystallographica B29 2789-2794 |  |
1973 | Tsumeb mine, Namibia, Africa | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.244 Å | (100) |
| 4.663 Å | (90) |
| 2.863 Å | (90) |
| 2.742 Å | (70) |
| 3.021 Å | (60) |
| 2.573 Å | (50) |
| 2.540 Å | (40) |
Geological EnvironmentHide
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Type Occurrence of TsumcoriteHide
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General Appearance of Type Material:
Radiating fibrous crusts.
Place of Conservation of Type Material:
Associated Minerals at Type Locality:
Synonyms of TsumcoriteHide
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Other Language Names for TsumcoriteHide
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Relationship of Tsumcorite to other SpeciesHide
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Other Members of Tsumcorite Group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for TsumcoriteHide
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References for TsumcoriteHide
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Reference List:
Krause, Werner, Belendorff, Klaus, Bernhardt, Heinz-Jürgen, Mccammon, Catherine, Effenberger, Herta, Mikenda, Werner (1998) Crystal chemistry of the tsumcorite-group minerals. New data on ferrilotharmeyerite, tsumcorite, thometzekite, mounanaite, helmutwinklerite, and a redefinition of gartrellite. European Journal of Mineralogy, 10 (2). 179-206 doi:10.1127/ejm/10/2/0179
Localities for TsumcoriteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 
- Good crystals or important locality for species. 
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.