Imhofite Mineral Data

Imhofite Mineral Data +

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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).

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 - PrismaticH-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),

Crystal Structure:

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Divjakovic V , Nowacki W , Zeitschrift fur Kristallographie , 144 (1976) p.323-333, Die kristallstruktur von imhofit, Tl5.6As15S25.3, Locality: synthetic

Physical Properties of Imhofite

Cleavage:

[???] Good

Color:

Copper red.

Density:

4.39

Diaphaniety:

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:

r_electron=4.79 gm/cc
note: r_Imhofite=5.37 gm/cc.

Fermion Index

Fermion Index = 0.00255
Boson Index = 0.99745

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Imhofite is Not Radioactive

Imhofite Classification

Dana Class:

3.5.11.1 (3)Sulfides - Sulfosalts

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

(3.5.11)Dana Group

3.5.11.1 Imhofite Tl6CuAs16S40 P 2₁/n 2/m

3.5.11.2 Gabrielite! Tl6Ag3Cu6As9S21 P1 1

Strunz Class:

II/E.14-15 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Thallium and Mercury, x = 4.0 - 1.6

II/E.14 - Rebulite - Chabourneite series

II/E.14-10 Rebulite Tl5Sb5As8S22 P 2₁/c 2/m

II/E.14-12 Jankovicite Tl5Sb9(As,Sb)4S22 P1 1

II/E.14-15 Imhofite Tl6CuAs16S40 P 2₁/n 2/m

II/E.14-20 Bernardite Tl(As,Sb)5S8 P 2₁/c 2/m

II/E.14-25 Gillulyite Tl2(As,Sb)8S13 P 2/n 2/m

II/E.14-30 Pierrotite Tl2Sb6As4S16 P na2₁ mm2

II/E.14-40 Parapierrotite Tl(Sb,As)5S8 P 2₁/n 2/m

II/E.14-50 Chabourneite (Tl,Pb)21(Sb,As)91S147 P1 1

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Imhofite

Tl6CuAs16S40
Dana No: 3.5.11.1 Strunz No: II/E.14-15
Locality:

Notes: