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Gabrielite

Formula:
Tl
 
6
Ag
 
3
Cu
 
6
(As,Sb)
 
9
S
 
21
System:TriclinicColour:grey to black
Hardness:1½ - 2
Name:Named for Walter Gabriel of Basel, Switzerland, well-known mineral photographer and expert of the Lengenbach minerals
This page provides mineralogical data about Gabrielite.

Classification of Gabrielite

IMA status:Approved 2002
Strunz 8th edition ID:2/E.14-
Nickel-Strunz 10th (pending) edition ID: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
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Type Occurrence of Gabrielite

Type Locality:Lengenbach Quarry, Im Feld (Imfeld; Feld; Fäld), Binn Valley, Wallis (Valais), Switzerland
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:
TrechmanniteTennantiteRealgarRathiteHutchinsonite
HatchiteEdenharterite

Physical Properties of Gabrielite

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

Crystallography of Gabrielite

Crystal System:Triclinic
Class (H-M):1 - Pedial
Space Group:P1
Cell Parameters:a = 12.138Å, b = 12.196Å, c = 15.944Å
α = 78.537°, β = 84.715°, γ = 60.47°
Ratio:a:b:c = 0.995 : 1 : 1.307
Unit Cell Volume: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 Diffraction:
d-spacingIntensity
15.63 (100)
3.143 (90)
3.531 (80)
2.911 (70)
2.520 (60)
Comments:Format: dobs/Å (Iobs/%) (hkl)

Optical Data of Gabrielite

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


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

Chemical Properties of Gabrielite

Formula:
Tl
 
6
Ag
 
3
Cu
 
6
(As,Sb)
 
9
S
 
21
Idealised Formula:
Tl
 
2
AgCu
 
2
As
 
3
S
 
7
Essential elements:
All elements listed in formula:Ag, As, Cu, S, Sb, Tl
Analyical Data:Mean values out of 11 electron microprobe analyses
Tl (37.30)
Cu (12.50)
Ag (8.47)
As (18.90)
Sb (1.79)
S (20.64)

sum 99.70 wt%
Empirical Formula:
Tl
 
5.95
Ag
 
2.56
Cu
 
6.46
S
 
9.02
As
 
8.23
Sb
 
0.48
S
 
21

Relationship of Gabrielite to other Species

Related Minerals - Nickel-Strunz Grouping):
2.HD.05Lorándite
TlAsS
 
2
2.HD.10Weissbergite
TlSbS
 
2
2.HD.15Christite
TlHgAsS
 
3
2.HD.20Jankovićite
Tl
 
5
Sb
 
9
(As,Sb)
 
4
S
 
22
2.HD.20Jankovicite
2.HD.25Rebulite
Tl
 
5
Sb
 
5
As
 
8
S
 
22
2.HD.30Imhofite
Tl
 
6
CuAs
 
16
S
 
40
2.HD.35Edenharterite
PbTlAs
 
3
S
 
6
2.HD.40Jentschite
TlPbAs
 
2
SbS
 
6
2.HD.45Hutchinsonite
(Tl,Pb)
 
2
As
 
5
S
 
9
2.HD.50Bernardite
Tl(As,Sb)
 
5
S
 
8
2.HD.55Sicherite
TlAg
 
2
(As,Sb)
 
3
S
 
6

Other Names for Gabrielite

Synonyms:
IMA2002-053
German names:
Gabrielit
Russian names:
Габриелит

Other Information

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

References for Gabrielite

Reference List: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 Gabrielite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Gabrielite in the Natural History Museum (London) online catalogue
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    Localities for Gabrielite

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    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Switzerland
     
    • Wallis (Valais)
      • Binn Valley
        • Im Feld (Imfeld; Feld; Fäld)
    		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
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