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Gabrielite

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Walter Gabriel
Formula:
Tl6Ag3Cu6(As,Sb)9S21
System:
Triclinic
Colour:
grey to black
Hardness:
1½ - 2
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.

Classification of Gabrielite

Approved 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
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http://www.mindat.org/min-26386.html
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Type Occurrence of Gabrielite

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

Physical Properties of Gabrielite

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:
5.38 g/cm3 (Calculated)

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 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)

Optical Data of Gabrielite

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 Gabrielite

Formula:
Tl6Ag3Cu6(As,Sb)9S21
Idealised Formula:
Tl2AgCu2As3S7
Essential elements:
All elements listed in formula:
Analytical 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:
Tl5.95Ag2.56Cu6.46S9.02As8.23Sb0.48S21

Relationship of Gabrielite to other Species

2.HD.05LoránditeTlAsS2
2.HD.05WeissbergiteTlSbS2
2.HD.15ChristiteTlHgAsS3
2.HD.20JankovićiteTl5Sb9(As,Sb)4S22
2.HD.25RebuliteTl5Sb5As8S22
2.HD.30ImhofiteTl5.8As15.4S26
2.HD.35EdenharteritePbTlAs3S6
2.HD.40JentschiteTlPbAs2SbS6
2.HD.45HutchinsoniteTlPbAs5S9
2.HD.50BernarditeTl(As,Sb)5S8
2.HD.55SicheriteTlAg2(As,Sb)3S6

Other Names for Gabrielite

Name in Other Languages:
German:Gabrielit
Simplified Chinese:硫砷银铜铊矿

Other Information

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 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

Localities for Gabrielite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (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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