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Blu Lake (Bleu Lake), Gobba di Rollin-Rocca di Verra ridge - Blu Lake area, Champoluc, Ayas, Ayas Valley, Aosta Valley, Italy

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Latitude & Longitude (WGS84): 45° 53' 29'' North , 7° 44' 37'' East
Latitude & Longitude (decimal): 45.89144,7.74364
GeoHash:G#: u0jt04qc0
Other regions containing this locality:The Alps, Europe
Locality type:Lake
Köppen climate type:Dfc : Subarctic climate
Name(s) in local language(s):Lago Blu (Lac Bleu), Catena della Gobba di Rollin-Rocca di Verra - area del Lago Blu (Chaîne de la Bosse de Rollin-Rocca di Verra - région du Lac Bleu), Champoluc, Ayas, Val d'Ayas, Valle d'Aosta (Vallée d'Aoste), Italia

Lago Blu (aka Lac Bleu, Lac de Verra, Lac Bleu de Verraz or Lac Bleu de Veraz) is a small moraine-dammed lake situated at 2215 m a.s.l. between the east slope of Rocca di Verra and the western lateral moraine of Grande Ghiacciaio di Verra (aka Ghiacciaio Grande di Verra, Ghiacciaio di Verra Grande, Grand Glacier de Verra, Grand Glacier de Verraz, or Grand Glacier de Véraz). It formed in the second half of the 18th century, when the tongue of the glacier advanced considerably causing the first damming phase of the lake (The glacier front reached the maximum expansion in the period 1819-21 near the bridge over the Verra stream, at the north margin of Pian di Verra Inferiore).

Minerals are found in the rock debris (mainly consisting of serpentinites and subordinate rodingites) forming the screes at the foot of Rocca di Verra and the large western lateral moraine of Grande Ghiacciaio di Verra.

Mineral List

10 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

0.0117 - 2.588 Ma

ID: 2358816
Quartre Lockergesteine

Age: Pleistocene (0.0117 - 2.588 Ma)

Lithology: Loamy gravel, sand, silt, blocks (moraine)

Reference: Geological Institute. Geological Map of Switzerland 1:500,000. isbn: 3906723399. University of Bern. [49]

Paleozoic - Precambrian
252.17 - 4000 Ma

ID: 3155094
Penninic basement, Penninic nappes, Austroalpine nappes, Southern Alpes

Age: Eoarchean to Permian (252.17 - 4000 Ma)

Description: high grade metamorphic

Lithology: Gneiss

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Late Paleozoic
252.17 - 358.9 Ma

ID: 3187504
Paleozoic intrusive rocks

Age: Paleozoic (252.17 - 358.9 Ma)

Comments: Alps

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Fabbian, G.C. (1971) Ricerche di minerali e cristalli in Valle d'Aosta. Ed. Gruppo Mineralogico di Ivrea, Ivrea, 27 pp.
Maletto, G., Meda, F. (1976) Sulla diffusione della perowskite nelle serpentine e nelle rodingiti della provincia di Torino e della Valle d'Aosta. Notiziario di Mineralogia e Paleontologia (Riccione), 7, 7-19.
Castello, P. (1984) Informazioni di mineralogia valdostana - VI. Revue Valdôtaine d'Histoire Naturelle, 38, 29-35.
Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007) Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" di Alba, Ed., Alba, 607 pp.

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