Gabrielite Mineral Data

Gabrielite Mineral Data

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General Gabrielite Information

Chemical Formula:

Tl6Ag3Cu6As9S21

Composition:

Molecular Weight = 3,278.86 gm

Thallium 37.40 % Tl

Copper 11.63 % Cu

Silver 9.87 % Ag

Arsenic 20.56 % As

Sulfur 20.54 % S

______

100.00 %

Empirical Formula:

Tl₆Ag₃Cu₆As₉S₂₁

Environment:

Related to imhofite; structure determined

IMA Status:

Proposed IMA 2002 (Dana # Added)

Locality:

Lengenbach quarry, Binntal, Valais, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals and Mineral Names (CNMMN)

Synonym:

IMA2002-053

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Gabrielite Crystallography

Axial Ratios:

a:b:c =0.9952:1:1.3073

Cell Dimensions:

a = 12.138, b = 12.196, c = 15.944, Z = 2; alpha = 78.537°, beta = 84.715°, gamma = 60.47° V = 2,004.15 Den(Calc)= 5.43

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 15.63(1), 3.143(0.9), 3.531(0.8),2.911(0.7), 2.52(0.6), 2.978(0.6), 3.263(0.5),

Crystal Structure:

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Balic-Zunic T , Makovicky E , Karanovic L , Poleti D , Graeser S , The Canadian Mineralogist , 44 (2006) p.141-158, The crystal structure of gabrielite, Tl2AgCu2As3S7, a new species, of thallium sulfosalt from Lengenbach, Switzerland, Locality: Lengenbach, Switzerland

Physical Properties of Gabrielite

Color:

Black.

Diaphaniety:

Translucent

Luster:

Metallic

Optical Properties of Gabrielite

RL Anisotrophism:

Weak.

RL Color:

White with internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Gabrielite in Air**
λ	R	∑ R(λ)
460 nm	30.70
540 nm	29.40
580 nm	28.20
640 nm	26.80

**Calculated Relative Intensity Colors of Gabrielite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%
R

Calculated Properties of Gabrielite

Electron Density:

r_electron=4.75 gm/cc
note: r_Gabrielite=5.43 gm/cc.

Fermion Index

Fermion Index = 0.00154
Boson Index = 0.99846

Photoelectric:

PE_Gabrielite= 676.61 barns/electron
U=PE_Gabrielite x r_electron=3,213.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gabrielite is Not Radioactive

Gabrielite Classification

Dana Class:

3.5.11.2 (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/X.00-00 II - Sulfides and sulphosalts

II/X - Unclassified Strunz Sulfides and sulphosalts

II/X.00 - Rebulite - Chabourneite series

Other Gabrielite Information

See Also:

Links to other databases for Gabrielite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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

Gabrielite

Tl6Ag3Cu6As9S21
Dana No: 3.5.11.2 Strunz No: II/X.00-00
Locality:

Notes: