Gabrielite Mineral Data (original) (raw)

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

Click Here for Larger Gabrielite Image in a New Browser Window Images:

Click Here for Larger Gabrielite Image Gabrielite 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 - PinacoidalH-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

Click Here for Large Gabrielite Structure Window Crystal Structure:

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Help on Above

| | 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

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

RelativeIntensity 0% 40% 80% 100% 120% 160% 200% 240% 280% 320%
R

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:

03.05.11.02 (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

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

Gabrielite

Tl2AgCu2As3S7
Dana No: 03.05.11.02 Strunz No: 02.HD.60
Locality:

Notes: