Mineralogy Database

Gabrielite Mineral Data

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General Gabrielite Information

Help on Chemical  Formula: Chemical Formula: Tl2AgCu2As3S7
Help on Composition: Composition: Molecular Weight = 1,082.85 gm
   Thallium  37.37 %  Tl
   Copper    12.68 %  Cu
   Silver     8.47 %  Ag
   Antimony   1.80 %  Sb
   Arsenic   18.96 %  As
   Sulfur    20.73 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: Tl1.98Ag0.85Cu2.16As2.74Sb0.16S7
Help on Environment: Environment: Found in association with numerous other As sulfosalts. Related to imhofite; structure determined
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Lengenbach quarry, Binntal, Valais, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Nameed for Walter Gabriel (b. 1943), of Basel, Switzerland, a well-known mineral photographer and expert on Lengenbach minerals.
Help on Synonym: Synonym: IMA2002-053

Gabrielite Image

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Comments: SEM picture of gabrielite showing the dominant (001) face with striation along a axis and (presumable) twinning along (100). (CanMin, v44:135).
Location: Lengenbach locality, at Binntal, Canton Valais, Switzerland. Scale: See Image.
© Canadian Mineralogist

Gabrielite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9952:1:1.3073
Help on Cell Dimensions: Cell Dimensions: a = 12.138, b = 12.196, c = 15.944, Z = 6; alpha = 78.537°, beta = 84.715°, gamma = 60.47° V = 2,004.15 Den(Calc)= 5.38
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 15.631(1)(001 ), 3.143(0.9)(214), 3.531(0.8)(300 ), 2.911(0.7)(422 ), 2.52(0.6)(223), 2.978(0.6)(324 ), 3.263(0.5)(031), 3.468(0.4)(233 ), 3.944(0.4)(32

Physical Properties of Gabrielite

Help on Cleavage: Cleavage: {001} Very Good
Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Metallic
Help on Streak: Streak: blackish red

Optical Properties of Gabrielite

Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on RL Bireflectance: RL Bireflectance: None.
Help on RL Color: RL Color: White with red internal reflections.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Gabrielite in Air
λ R  ∑ R(λ) 
 460 nm   30.70   
 470 nm   30.53 
 540 nm   29.40 
 546 nm   29.10 
 580 nm   28.20 
 589 nm   27.94 
 640 nm   26.80 
 650 nm   26.35 
Calculated Relative Intensity Colors of Gabrielite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320%

Calculated Properties of Gabrielite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.69 gm/cc
note: Specific Gravity of Gabrielite =5.36 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0015546564
Boson Index = 0.9984453436
Help on Photoelectric: Photoelectric: PEGabrielite = 677.90 barns/electron
U=PEGabrielite x rElectron Density=3,178.01 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gabrielite is Not Radioactive

Gabrielite Classification

Help on  Dana Class: Dana Class: (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 Imhofite Tl6CuAs16S40 P 21/n 2/m Gabrielite! Tl2AgCu2As3S7 P1 1
Help on  Strunz Class: Strunz Class: 02.HD.60 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HD -With Tl
02.HD.60 Gabrielite! Tl2AgCu2As3S7 P1 1

Other Gabrielite Information

Help on References: References: NAME( AmMin, v91, p1946) PHYS. PROP.(AmMin, v91, p1946) OPTIC PROP.(AmMin, v91, p1946)
Help on See Also: See Also: Links to other databases for Gabrielite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 02.HD.60





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