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Gabrielite

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Walter Gabriel
Formula:
Tl6Ag3Cu6(As,Sb)9S21
Colour:
grey to black
Lustre:
Metallic
Hardness:
1½ - 2
Specific Gravity:
5.38 (Calculated)
Crystal System:
Triclinic
Name:
Named for Walter Gabriel of Basel/Münchenstein, Switzerland, well-known mineral photographer and expert of the Lengenbach minerals.
This page provides mineralogical data about Gabrielite.


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Classification of GabrieliteHide

Approved
Approval Year:
2002
2.HD.60

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
D : With Tl

Physical Properties of GabrieliteHide

Metallic
Transparency:
Opaque
Colour:
grey to black
Streak:
blackish red
Hardness:
1½ - 2 on Mohs scale
Hardness:
VHN10=18 kg/mm2 - Vickers
Cleavage:
Perfect
along (001)
Density:
5.38 g/cm3 (Calculated)

Optical Data of GabrieliteHide

Type:
Anisotropic
Anisotropism:
weak
Reflectivity:
470nmR=30.53%
546nmR=29.1%
589nmR=27.94%
650nmR=26.35%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 30.53%.
Colour in reflected light:
white
Internal Reflections:
red

Chemical Properties of GabrieliteHide

Formula:
Tl6Ag3Cu6(As,Sb)9S21
IMA Formula:
Tl2AgCu2As3S7
Idealised Formula:
Tl2AgCu2As3S7

Crystallography of GabrieliteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 12.138 Å, b = 12.196 Å, c = 15.944 Å
α = 78.537°, β = 84.715°, γ = 60.47°
Ratio:
a:b:c = 0.995 : 1 : 1.307
Unit Cell V:
2013 ų
Z:
6
Morphology:
pseudohexagonal crystals, short prismatic to platy parallel to (001)
Twinning:
common, with (100) as twin plane

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
15.63 (100)
3.143 (90)
3.531 (80)
2.911 (70)
2.520 (60)
2.978 (60)
Comments:
Format: dobs/Å (Iobs/%) (hkl)

Type Occurrence of GabrieliteHide

General Appearance of Type Material:
idiomorphic short-prismatic to platy crystals up to approximately 0.4 mm, and aggregates to about 1 mm across
Geological Setting of Type Material:
arsenic-rich sulphide mineralization in triassic dolomite
Associated Minerals at Type Locality:

Synonyms of GabrieliteHide

Other Language Names for GabrieliteHide

German:Gabrielit
Simplified Chinese:硫砷银铜铊矿

Related Minerals - Nickel-Strunz GroupingHide

2.HD.05LoránditeTlAsS2Mon. 2/m : P21/b
2.HD.05WeissbergiteTlSbS2Tric. 1 : P1
2.HD.15ChristiteTlHgAsS3Mon. 2/m
2.HD.20JankovićiteTl5Sb9(As,Sb)4S22Tric. 1 : P1
2.HD.25RebuliteTl5Sb5As8S22Mon. 2/m : P21/b
2.HD.30ImhofiteTl5.8As15.4S26Mon. 2/m
2.HD.35EdenharteritePbTlAs3S6Orth.
2.HD.40JentschiteTlPbAs2SbS6Mon.
2.HD.45HutchinsoniteTlPbAs5S9Orth.
2.HD.50BernarditeTlAs5S8Mon. 2/m : P21/b
2.HD.55SicheriteTlAg2(As,Sb)3S6Orth.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for GabrieliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Graeser, S., Topa, D., Balić-Žunić, T., Makovicky, E. (2006): Gabrielite, Tl2AgCu2As3S7, a new species of thallium sulfosalt from Lengenbach, Binntal, Switzerland. Canadian Mineralogist: 44: 135-140.
Balić-Žunić, T., Makovicky, E., Karanović, L., Poleti, D., Graeser, S. (2006): The crystal structure of gabrielite, Tl2AgCu2As3S7, a new species of thallium sulfosalt from Lengenbach, Switzerland. Canadian Mineralogist: 44: 141-158.

Internet Links for GabrieliteHide

Localities for GabrieliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Switzerland (TL)
 
  • Wallis (Valais)
    • Binn Valley
      • Fäld (Imfeld; Im Feld; Feld)
Graeser, S., Topa, D., Balić-Žunić, T., Makovicky, E. (2006): Gabrielite, Tl2AgCu2As3S7, a new species of thallium sulfosalt from Lengenbach, Binntal, Switzerland. Canadian Mineralogist 44:135-140
Mineral and/or Locality  
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