Mineralogy Database

Tischendorfite Mineral Data

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General Tischendorfite Information

Help on Chemical  Formula: Chemical Formula: Pd8Hg3Se9
Help on Composition: Composition: Molecular Weight = 2,150.81 gm
   Silver      1.00 %  Ag
   Mercury    25.18 %  Hg
   Palladium  39.58 %  Pd
   Lead        1.93 %  Pb
   Selenium   32.31 %  Se
             100.00 % 
Help on Empirical Formula: Empirical Formula: Pd8Hg2.7Ag0.2Pb0.2Se8.8
Help on Environment: Environment: Included mineral found in other selenides in an ankerite-calcite matrix.
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Eskeborn adit near Tilkerode, Harz Mountians, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Name for Gerhard Tischendorf (1927-) who first recognized the mineral in the deposit in 1958.
Help on Synonym: Synonym: IMA2001-061

Tischendorfite Image

Click Here for Larger   Image in a New Browser Window 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

Tischendorfite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4301:1:0.3853
Help on Cell Dimensions: Cell Dimensions: a = 7.219, b = 16.782, c = 6.467, Z = 2; V = 783.47 Den(Calc)= 9.12
Help on Crystal System: Crystal System: Orthorhombic Space Group: Pmmn, P 21mn or Pm21n
Help on X Ray Diffraction: 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),

Physical Properties of Tischendorfite

Help on Color: Color: Beige.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Tischendorfite

Help on RL Anisotrophism: RL Anisotrophism: Weak to moderate with rotation tints of steel blue to greenish brown.
Help on RL Bireflectance: RL Bireflectance: Weak.
Help on RL Color: RL Color: Cream to slightly beige with no internal reflections.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tischendorfite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   46.80   51.30 
 546 nm   49.40   53.10 
 589 nm   49.90   53.25 
 650 nm   48.95   52.55 
Standardized Intensity (100%) Reflection Spectra of Tischendorfite in Oil
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   33.90   38.30 
 546 nm   35.90   39.50 
 589 nm   36.50   39.90 
 650 nm   35.70   39.60 
Calculated Relative Intensity Colors of Tischendorfite in Air
   0%   20%   40%   60%   80% 100% 120% 140% 160% 180% 190%
Calculated Relative Intensity Colors of Tischendorfite in Oil
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 260%

Calculated Properties of Tischendorfite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.71 gm/cc
note: Specific Gravity of Tischendorfite =9.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.19
Boson Index = 0.81
Help on Photoelectric: Photoelectric: PETischendorfite = 584.16 barns/electron
U=PETischendorfite x rElectron Density=4,503.18 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tischendorfite is Not Radioactive

Tischendorfite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.07)where Am Bn Xp, with (m+n):p=9:8
  (02.07.06)Dana Group Tischendorfite! Pd8Hg3Se9 Pmmn, P 21mn or Pm21n Ortho
Help on  Strunz Class: Strunz Class: 02.BC.65 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)
  02.BC -With Rh, Pd, Pt, etc.
02.BC.65 Tischendorfite! Pd8Hg3Se9 Pmmn, P 21mn or Pm21n Ortho

Other Tischendorfite Information

Help on References: References: NAME( AmMin, Vol 88, p 478) PHYS. PROP.(AmMin, Vol 88, p 478) OPTIC PROP.(AmMin, Vol 88, p 478)
Help on See Also: 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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Dana No: Strunz No: 02.BC.65





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