Latitude: 44°55'N
Longitude: 6°21'E
Tl-rich hydrothermal stratiform deposit in triasic dolomitic limestones.
Located in the Écrins National Park ('Parc national des Ecrins'). Mineral collecting is not allowed.
Note on the mineral list: Johan & Mantienne (2000) also describe four new phases:
- Pb9Ag(Sb,As)13S29 with optical properties similar to jamesonite, with a monoclinic unit-cell with a = 17.640, b = 18.464, c = 3.967 A, beta = 90°48', V = 1292 A 3, Z = 1, Dcalc = 5.51
- a phase Tl(As,Sb)10S16 that is X-ray amorphous
- a phase Tl(Sb,As)7S11 that is weakly anisotropic with reflectivity close to chabourneite
- a phase Ag2SbAsS4, representing a reaction product between smithite and chabourneite
Additional gangue minerals include: albite, apatite, "chlorite", fluorite, graphite, microcline, orthoclase, rutile, "sericite", "tourmalite" and zircon. Most of them are described in Mantienne's PhD work (1974).
Mineral List
46 entries listed. 41 valid minerals. 4 type localities (valid minerals). 3 erroneous literature entries.
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References
• Mantienne, J (1974): La minéralisation thallifère de Jas Roux. PhD thesis, Université de Paris, 203 p.
• Bourgoin, V., Favreau, G., Boulliard, J.-C. (2011): Jas Roux: un gisement exceptionnel à minéraux de thallium. Le Cahier des Micromonteurs, 3-2011, 2-91.
• Johan, Z. & Mantienne, J. (2000): Thallium-rich mineralization at Jas Roux, Hautes-Alpes, France: a complex epithermal, sediment-hosted, ore-forming system. J. Czech Geol. Soc. 45, 63-77.
• Caubel, A. & Galvier, J. (2000): Le Thallium, ses minéraux, son utilisation. Le Règne Minéral, 32, 31-43.
• Asselborn, E. (1982): Jas Roux: Seltene Sulfosalze aus den französischen Alpen. Lapis, 7 (1), 29-xx (in German).
• Boulliard, J.C., Morin, G., Bourgoin, V. & Favreau, G. (2010): Minerals of Jas-Roux (France): an update. 20th General Meeting of the IMA (IMA2010), Budapest, Hungary, August 21-27, CD of Abstracts, p. 422.
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