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Tischendorfite Mineral Data
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General Tischendorfite Information
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 Chemical Formula: |
Pd8Hg3Se9 |
| Composition: |
Molecular Weight = 2,150.81 gm |
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Silver 1.00 % Ag |
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Mercury 25.18 % Hg |
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Palladium 39.58 % Pd |
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Lead 1.93 % Pb |
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Selenium 32.31 % Se |
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______ |
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100.00 % |
| Empirical Formula: |
Pd8Hg2.7Ag0.2Pb0.2Se8.8 |
| Environment: |
Included mineral found in other selenides in an ankerite-calcite matrix. |
| IMA Status: |
Approved IMA 2002 (Dana # Added) |
| Locality: |
Eskeborn adit near Tilkerode, Harz Mountians, Germany. Link to MinDat.org Location Data. |
| Name Origin: |
Name for Gerhard Tischendorf (1927-) who first recognized the mineral in the deposit in 1958. |
| Synonym: |
IMA2001-061 |
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Tischendorfite Image |
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Images:
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Tischendorfite Tiemannite Chrisstanleyite
Comments: Polished section (PPL) showing tischendorfite (T, cream), clausthalite (Cl, off-white), tiemannite (Tie, gray), ankerite (black) and chrisstanleyite (C, greenish buff to pale brown).
Location: Eskaborner Stollen (Eskeborn Adit) at Tilkerode, Harz, Mountains, Germany. (CanMin v40:739).
Scale: Picture Size 275 µm.
© Canadian Mineralogist |
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Tischendorfite Crystallography
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| Axial Ratios: |
a:b:c =0.4301:1:0.3853 |
| Cell Dimensions: |
a = 7.219, b = 16.782, c = 6.467, Z = 2; V = 783.47 Den(Calc)= 9.12 |
| Crystal System: |
Orthorhombic Space Group: Pmmn, P 21mn or Pm21n |
| X Ray Diffraction: |
By Intensity(I/Io): 2.116(0.4)(062), 2.325(0.4)(052), 4.373(0.4)(130),4.819(0.4)(101), 2.797(0.6)(032,122), 2.091(1)(261), 2.743(1)(151,231,240), |
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Physical Properties of Tischendorfite
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| Color: |
Beige. |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Hardness: |
5 - Apatite |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Tischendorfite
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| RL Anisotrophism: |
Weak to moderate with rotation tints of steel blue to greenish brown. |
| RL Bireflectance: |
Weak. |
| RL Color: |
Cream to slightly beige with no internal reflections. |
| RL Pleochroism: |
None. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Tischendorfite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
46.80 |
51.30 |
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| 546 nm |
49.40 |
53.10 |
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| 589 nm |
49.90 |
53.25 |
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| 650 nm |
48.95 |
52.55 |
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Standardized Intensity (100%) Reflection Spectra of Tischendorfite in Oil
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
33.90 |
38.30 |
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| 546 nm |
35.90 |
39.50 |
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| 589 nm |
36.50 |
39.90 |
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| 650 nm |
35.70 |
39.60 |
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Calculated Relative Intensity Colors of Tischendorfite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
180% |
190% |
| R1 |
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| R2 |
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Calculated Relative Intensity Colors of Tischendorfite in Oil
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
260% |
| R1 |
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| R2 |
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Calculated Properties of Tischendorfite
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| Electron Density: |
Bulk Density (Electron Density)=7.71 gm/cc
note: Specific Gravity of Tischendorfite =9.12 gm/cc.
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| Fermion Index: |
Fermion Index = 0.19
Boson Index = 0.81 |
| Photoelectric: |
PETischendorfite = 584.16 barns/electron
U=PETischendorfite x rElectron Density=4,503.18 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tischendorfite is Not Radioactive |
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Tischendorfite Classification
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| Dana Class: |
02.07.06.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.07)where Am Bn Xp, with (m+n):p=9:8 |
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(02.07.06)Dana Group |
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02.07.06.01 Tischendorfite! Pd8Hg3Se9 Pmmn, P 21mn or Pm21n Ortho |
| Strunz Class: |
02.BC.65 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BC -With Rh, Pd, Pt, etc. |
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02.BC.65 Tischendorfite! Pd8Hg3Se9 Pmmn, P 21mn or Pm21n Ortho |
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Other Tischendorfite Information
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| References: |
NAME( AmMin, Vol 88, p 478) PHYS. PROP.(AmMin, Vol 88, p 478) OPTIC PROP.(AmMin, Vol 88, p 478) |
| See Also: |
Links to other databases for Tischendorfite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
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Tischendorfite
Pd8Hg3Se9
Dana No: 02.07.06.01 Strunz No: 02.BC.65
Locality:
Notes:
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