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Gabrielite Mineral Data
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General Gabrielite Information
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 Chemical Formula: |
Tl2AgCu2As3S7 |
| Composition: |
Molecular Weight = 1,082.85 gm |
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Thallium 37.37 % Tl |
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Copper 12.68 % Cu |
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Silver 8.47 % Ag |
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Antimony 1.80 % Sb |
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Arsenic 18.96 % As |
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Sulfur 20.73 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Tl1.98Ag0.85Cu2.16As2.74Sb0.16S7 |
| Environment: |
Found in association with numerous other As sulfosalts. Related to imhofite; structure determined |
| IMA Status: |
Approved IMA 2002 (Dana # Added) |
| Locality: |
Lengenbach quarry, Binntal, Valais, Switzerland. Link to MinDat.org Location Data. |
| Name Origin: |
Nameed for Walter Gabriel (b. 1943), of Basel, Switzerland, a well-known mineral photographer and expert on Lengenbach minerals. |
| Synonym: |
IMA2002-053 |
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Gabrielite Image |
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Images:
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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 |
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Gabrielite Crystallography
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| Axial Ratios: |
a:b:c =0.9952:1:1.3073 |
| 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 |
| Crystal System: |
Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1 |
| 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 |
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Physical Properties of Gabrielite
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| Cleavage: |
{001} Very Good |
| Color: |
Black. |
| Diaphaneity: |
Opaque |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Habit: |
Pseudo Hexagonal - Crystals show a hexagonal outline. |
| Habit: |
Striated - Parallel lines on crystal surface or cleavage face. |
| Hardness: |
1.5-2 - Talc-Gypsum |
| Luster: |
Metallic |
| Streak: |
blackish red |
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Optical Properties of Gabrielite
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| RL Anisotrophism: |
Weak. |
| RL Bireflectance: |
None. |
| RL Color: |
White with red internal reflections. |
| RL Pleochroism: |
None. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Gabrielite in Air
| λ |
R |
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∑ R(λ) |
| 460 nm |
30.70 |
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| 470 nm |
30.53 |
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| 540 nm |
29.40 |
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| 546 nm |
29.10 |
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| 580 nm |
28.20 |
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| 589 nm |
27.94 |
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| 640 nm |
26.80 |
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| 650 nm |
26.35 |
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Calculated Relative Intensity Colors of Gabrielite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
| R |
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Calculated Properties of Gabrielite
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| Electron Density: |
Bulk Density (Electron Density)=4.69 gm/cc
note: Specific Gravity of Gabrielite =5.36 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0015546564
Boson Index = 0.9984453436 |
| Photoelectric: |
PEGabrielite = 677.90 barns/electron
U=PEGabrielite x rElectron Density=3,178.01 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gabrielite is Not Radioactive |
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Gabrielite Classification
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| Dana Class: |
03.05.11.02 (03)Sulfides - Sulfosalts |
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(03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.05.11)Dana Group |
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03.05.11.01 Imhofite Tl6CuAs16S40 P 21/n 2/m |
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03.05.11.02 Gabrielite! Tl2AgCu2As3S7 P1 1 |
| Strunz Class: |
02.HD.60 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.H - Sulfosalts of SnS Archetype |
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02.HD -With Tl |
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02.HD.60 Gabrielite! Tl2AgCu2As3S7 P1 1 |
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Other Gabrielite Information
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| References: |
NAME( AmMin, v91, p1946) PHYS. PROP.(AmMin, v91, p1946) OPTIC PROP.(AmMin, v91, p1946) |
| 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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Print or Cut-and-Paste your Gabrielite Specimen Label here :
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Gabrielite
Tl2AgCu2As3S7
Dana No: 03.05.11.02 Strunz No: 02.HD.60
Locality:
Notes:
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