Tischendorfite Mineral Data

General Tischendorfite Information

Chemical Formula:

Pd8Hg3Se9

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 %

Empirical Formula:

Pd₈Hg_2.7Ag_0.2Pb_0.2Se_8.8

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

Tischendorfite Image

Images:

Click Here for Larger Tischendorfite Image

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

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:

OrthorhombicSpace Group: Pmmn, P 2₁mn or Pm21n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

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

Optical Properties of Tischendorfite

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	∑ 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**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R₁
R₂

**Calculated Relative Intensity Colors of Tischendorfite in Oil**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	260%
R₁
R₂

Calculated Properties of Tischendorfite

Electron Density:

Bulk Density (Electron Density)=7.71 gm/cc
note: Specific Gravity of Tischendorfite =9.12 gm/cc.

Fermion Index:

Fermion Index = 0.19
Boson Index = 0.81

Photoelectric:

PE_{Tischendorfite}= 584.16 barns/electron
U=PE_{Tischendorfite} x rElectron Density=4,503.18 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tischendorfite is Not Radioactive

Tischendorfite Classification

Dana Class:

02.07.06.01 (02)Sulfides - Including Selenides and Tellurides

(02.07)where Am Bn Xp, with (m+n):p=9:8

(02.07.06)Dana Group

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

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

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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Print or Cut-and-Paste your Tischendorfite Specimen Label here :

Tischendorfite

Pd8Hg3Se9
Dana No: 02.07.06.01 Strunz No: 02.BC.65
Locality:

Notes: