Imhofite Mineral Data

General Imhofite Information

Chemical Formula:

Tl6CuAs16S40

Composition:

Molecular Weight = 3,771.23 gm

Thallium 32.52 % Tl

Copper 1.69 % Cu

Arsenic 31.79 % As

Sulfur 34.01 % S

______

100.00 %

Empirical Formula:

Tl₆CuAs₁₆S₄₀

Environment:

Of hydrothermal origin.

IMA Status:

Approved IMA 1965

Locality:

From the Kengenbach quarry, Binntal, Valais, Switzerland. Link to MinDat.org Location Data.

Name Origin:

For Jospeh Imhof (1902-1969).

Name Pronunciation:

Imhofite

Synonym:

ICSD 38362

PDF 25-936

Imhofite Image

Images:

Imhofite

Comments: Dark red crystals and aggregates of imhofite in matrix.
Location: Lengenbach quarry, Binntal, Wallis (Valais), Switzerland. Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Imhofite

Comments: Spherical, spikey-radial brownish black aggregate of imhofite with blocky gray sulfosalt on white dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Picture width 3 mm.
© Walter Gabriel

Imhofite Crystallography

Axial Ratios:

a:b:c =0.3584:1:0.2349

Cell Dimensions:

a = 8.755, b = 24.425, c = 5.739, Z = 1; beta = 108.28° V = 1,165.30 Den(Calc)= 5.37

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 2.675(1), 2.883(0.9), 3.96(0.7),

Physical Properties of Imhofite

Cleavage:

{???} Good

Color:

Copper red.

Density:

4.39

Diaphaneity:

Translucent

Hardness:

2 - Gypsum

Luster:

Metallic

Streak:

purple

Optical Properties of Imhofite

RL Anisotrophism:

Very strong.

RL Color:

White, inclining to cream colored compared to galena, with strong bright red internal reflections.

Calculated Properties of Imhofite

Electron Density:

Bulk Density (Electron Density)=4.79 gm/cc
note: Specific Gravity of Imhofite =5.37 gm/cc.

Fermion Index:

Fermion Index = 0.0025508379
Boson Index = 0.9974491621

Photoelectric:

PE_Imhofite= 561.66 barns/electron
U=PE_Imhofite x rElectron Density=2,692.02 barns/cc.

Radioactivity:

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

Imhofite Classification

Dana Class:

03.05.11.01 (03)Sulfides - Sulfosalts

(03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.05.11)Dana Group

03.05.11.01 Imhofite Tl6CuAs16S40 P 2₁/n 2/m

03.05.11.02 Gabrielite! Tl2AgCu2As3S7 P1 1

Strunz Class:

02.HD.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HD -With Tl

02.HD.30 Imhofite Tl6CuAs16S40 P 2₁/n 2/m

Other Imhofite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Imhofite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Imhofite

Tl6CuAs16S40
Dana No: 03.05.11.01 Strunz No: 02.HD.30
Locality:

Notes:

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