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Tischendorfite
A valid IMA mineral species
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About Tischendorfite
Gerhard Tischendorf
Formula:
Pd8Hg3Se9
Colour:
Silver-grey
Lustre:
Metallic
Specific Gravity:
9.13 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Gerhard Tischendorf (25 December 1927, Treuen, Vogtland, German Empire - 10 December 2007, Zittau, Germany), geologist with the Central Geological Institute in Berlin and later the Central Institute for Physics of the Earth (ZIPE). He was a specialist in selenium deposits, who first described the mineral as an unknown species in 1958.
This page provides mineralogical data about Tischendorfite.
Unique Identifiers
Mindat ID:
11112
Long-form identifier:
mindat:1:1:11112:6
IMA Classification of Tischendorfite
Approved
Approval year:
2001
First published:
2002
Classification of Tischendorfite
2.BC.65
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
C : With Rh, Pd, Pt, etc.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
C : With Rh, Pd, Pt, etc.
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Tdf | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Tischendorfite
Metallic
Transparency:
Opaque
Colour:
Silver-grey
Streak:
Black
Hardness Data:
Could not be measured
Comment:
Polishing hardness near chrisstanleyite, greater than that of tiemannite and clausthalite, but lower than that of stibiopalladinite.
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
9.13 g/cm3 (Calculated)
Comment:
Could not be measured
Optical Data of Tischendorfite
Anisotropism:
Weak, steel blue to greenish brown
Bireflectance:
Weakly bireflectant
Reflectivity:
| Wavelength | R1 (%) | R2 (%) | imR1 (%) | imR2 (%) |
|---|---|---|---|---|
| 400nm | 38.2% | 43.3% | 27.85% | 33.2% |
| 420nm | 42.3% | 47.6% | 30.5% | 35.6% |
| 440nm | 44.6% | 49.6% | 32.35% | 37.3% |
| 460nm | 46.2% | 50.85% | 33.6% | 38.1% |
| 470nm | 46.8% | 51.3% | 33.9% | 38.3% |
| 480nm | 47.3% | 51.7% | 34.45% | 38.7% |
| 500nm | 48.2% | 52.4% | 34.95% | 39.0% |
| 520nm | 48.75% | 52.75% | 35.35% | 39.3% |
| 540nm | 49.3% | 53.1% | 35.75% | 39.5% |
| 546nm | 49.4% | 53.1% | 35.9% | 39.5% |
| 560nm | 49.7% | 53.1% | 36.2% | 39.6% |
| 580nm | 49.95% | 53.2% | 36.4% | 39.7% |
| 589nm | 49.9% | 53.25% | 36.5% | 39.9% |
| 600nm | 49.9% | 53.4% | 36.45% | 40.0% |
| 620nm | 49.8% | 53.3% | 36.2% | 39.8% |
| 640nm | 49.3% | 52.9% | 35.8% | 39.7% |
| 650nm | 48.95% | 52.55% | 35.7% | 39.6% |
| 660nm | 48.4% | 52.45% | 35.3% | 39.5% |
| 680nm | 47.0% | 50.7% | 34.2% | 38.5% |
| 700nm | 43.5% | 47.0% | 32.3% | 37.0% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 53.4%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Colour in reflected light:
Cream or slightly beige
Internal Reflections:
None
Pleochroism:
Non-pleochroic
Chemistry of Tischendorfite
Mindat Formula:
Pd8Hg3Se9
Element Weights:
Elements listed:
Crystallography of Tischendorfite
Crystal System:
Orthorhombic
Cell Parameters:
a = 7.219(3) Å, b = 16.782(7) Å, c = 6.467(5) Å
Ratio:
a:b:c = 0.43 : 1 : 0.385
Unit Cell V:
783.6 ų
Z:
2
Twinning:
No twinning observed
Comment:
Space group Pmmn (59), P21mn (31) or Pm21n (31). Cell parameters from Stanley et al. (2002).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.819 Å | (40) |
| 4.373 Å | (40) |
| 2.797 Å | (60) |
| 2.743 Å | (100) |
| 2.325 Å | (40) |
| 2.116 Å | (40) |
| 2.091 Å | (100) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Tischendorfite
General Appearance of Type Material:
Anhedral to subhedral grains, up to 100 μm in maximum dimension .
Place of Conservation of Type Material:
- Natural History Museum, London, U.K., num. BM 2001,8.
- GeoForschungsZentrum, Potsdam, Germany.
- Mineralogical Institute of the Technische Universität Bergakademie, Freiberg, Germany, num. 80160.
A single-crystal mount and two powder mounts are housed within the Systematic Reference Series of the National Mineral Collection of Canada, Geological Survey of Canada, Ottawa.
- GeoForschungsZentrum, Potsdam, Germany.
- Mineralogical Institute of the Technische Universität Bergakademie, Freiberg, Germany, num. 80160.
A single-crystal mount and two powder mounts are housed within the Systematic Reference Series of the National Mineral Collection of Canada, Geological Survey of Canada, Ottawa.
Geological Setting of Type Material:
Selenide vein deposit of telethermal origin.
Associated Minerals at Type Locality:
Synonyms of Tischendorfite
Other Language Names for Tischendorfite
Dutch:Tischendorfiet
German:Tischendorfit
Simplified Chinese:泰硒汞钯矿
Spanish:Tischendorfita
Traditional Chinese:泰硒汞鈀礦
Common Associates
Associations Based on Photo Data:
| 2 photos of Tischendorfite associated with Chrisstanleyite | Ag2Pd3Se4 |
| 2 photos of Tischendorfite associated with Clausthalite | PbSe |
| 2 photos of Tischendorfite associated with Tiemannite | HgSe |
| 2 photos of Tischendorfite associated with Stibiopalladinite | Pd5Sb2 |
| 1 photo of Tischendorfite associated with Tilkerodeite | Pd2HgSe3 |
| 1 photo of Tischendorfite associated with Hematite | Fe2O3 |
| 1 photo of Tischendorfite associated with Jacutingaite | Pt2HgSe3 |
| 1 photo of Tischendorfite associated with Ankerite | Ca(Fe2+,Mg)(CO3)2 |
Related Minerals - Strunz-mindat Grouping
| 2.BC. | Panskyite | Pd9Ag2Pb2S4 |
| 2.BC. | Fleetite | Cu2RhIrSb2 |
| 2.BC. | Coldwellite | Pd3Ag2S |
| 2.BC. | 'UM2004-45-Se:AgHgPd' | (Ag,Cu)6Hg2Pd2Se3 |
| 2.BC.05 | 'UM2000-47-S:CuFePdPt' | PtPd(Fe,Cu)S |
| 2.BC.05 | Miassite | Rh17S15 |
| 2.BC.05 | Palladseite | Pd17Se15 |
| 2.BC.10 | Oosterboschite | (Pd,Cu)7Se5 |
| 2.BC.15 | Chrisstanleyite | Ag2Pd3Se4 |
| 2.BC.15 | Jagüéite | Cu2Pd3Se4 |
| 2.BC.20 | Keithconnite | Pd20Te7 |
| 2.BC.25 | Vasilite | (Pd,Cu)16(S,Te)7 |
| 2.BC.30 | Telluropalladinite | Pd9Te4 |
| 2.BC.35 | Kojonenite | Pd7-xSnTe2 (0.3 ≤ x ≤ 0.8) |
| 2.BC.35 | Luberoite | Pt5Se4 |
| 2.BC.37 | Kravtsovite | PdAg2S |
| 2.BC.40 | Oulankaite | (Pd,Pt)5(Cu,Fe)4SnTe2S2 |
| 2.BC.40 | Lukkulaisvaaraite | Pd14Ag2Te9 |
| 2.BC.42 | Monchetundraite | Pd2NiTe2 |
| 2.BC.45 | Telargpalite | (Pd,Ag)3(Te,Bi) |
| 2.BC.45 | Thalhammerite | Pd9Ag2Bi2S4 |
| 2.BC.47 | Vymazalováite | Pd3Bi2S2 |
| 2.BC.50 | Temagamite | Pd3HgTe3 |
| 2.BC.55 | Bowlesite | PtSnS |
| 2.BC.55 | Sopcheite | Ag4Pd3Te4 |
| 2.BC.60 | Laflammeite | Pd3Pb2S2 |
Other Information
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 Tischendorfite
mindat.org URL:
https://www.mindat.org/min-11112.html
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References for Tischendorfite
Reference List:
Stanley, C. J., Criddle, A. J., Forster, H.-J., Roberts, A. C. (2002) Tischendorfite, Pd8Hg3Se9, a new mineral species from Tilkerode, Harz Mountains, Germany. The Canadian Mineralogist, 40 (2) 739-745 doi:10.2113/gscanmin.40.2.739
Mandarino, Joseph A. (2002) New minerals. The Canadian Mineralogist, 40 (5). 1527-1550 doi:10.2113/gscanmin.40.5.1529
Localities for Tischendorfite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Germany (TL) | |
| Stanley et al. (2002) +1 other reference |
Turkey | |
| Kozlu et al. (2010) |
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Eskaborn adit, Tilkerode Mining District, Mansfeld, Mansfeld-Südharz, Saxony-Anhalt, Germany