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Mont Orfeuille (north ridge), Avise, Aosta Valley, Italyi
Regional Level Types
Mont Orfeuille (north ridge)Mountain
Aosta ValleyAutonomous Region

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Name in French:Mont Orfeuille (arête nord), Avise, Vallée d'Aoste, Italie
Name in Italian:Monte Orfeuille (cresta nord), Avise, Valle d'Aosta, Italia
Latitude & Longitude (WGS84): 45° 40' 11'' North , 7° 3' 31'' East
Latitude & Longitude (decimal): 45.66977,7.05865
GeoHash:G#: u0j5b9gvw
Locality type:Mountain
Köppen climate type:ET : Tundra
Nearest Settlements:
Runaz126 (2014)6.8km
Derby-Villaret384 (2014)6.8km
Coveyrand-Vieu111 (2014)7.7km
Rhemes-Saint-Georges195 (2012)7.7km
Chabodey102 (2014)7.9km

Stilpnomelane-bearing schist (samples collected at 2629 m a.s.l.).

Regions containing this locality

Eurasian PlateTectonic Plate
The Alps, EuropeMountain Range

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

2 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

Detailed Mineral List:

Formula: Na(AlSi3O8)
Reference: Dal Piaz, G.V., and Govi, M. (1968) Lo stilpnomelano in Valle d'Aosta: nuovi ritrovamenti. Bollettino della Società Geologica Italiana, 87, 91-108.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Dal Piaz, G.V., and Govi, M. (1968) Lo stilpnomelano in Valle d'Aosta: nuovi ritrovamenti. Bollettino della Società Geologica Italiana, 87, 91-108.
Formula: (K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Reference: Dal Piaz, G.V., and Govi, M. (1968) Lo stilpnomelano in Valle d'Aosta: nuovi ritrovamenti. Bollettino della Società Geologica Italiana, 87, 91-108.

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates
Stilpnomelane9.EG.40(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Unclassified Minerals, Rocks, etc.
'Garnet Group'-X3Z2(SiO4)3

List of minerals arranged by Dana 8th Edition classification

Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined islands
Stilpnomelane74.1.1.1(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Unclassified Minerals, Mixtures, etc.
'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

H Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
O Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
O Garnet GroupX3Z2(SiO4)3
O AlbiteNa(AlSi3O8)
Na Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Na AlbiteNa(AlSi3O8)
Mg Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Al Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Al AlbiteNa(AlSi3O8)
Si Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Si Garnet GroupX3Z2(SiO4)3
Si AlbiteNa(AlSi3O8)
K Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Ca Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Fe Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O

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 Macrostrat.org

251.902 - 541 Ma

ID: 3130760
Palaeozoic gneiss

Age: Phanerozoic (251.902 - 541 Ma)

Description: high grade metamorphic

Lithology: Major:{gneiss}, Minor{granulite,greenschist}

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]

Cambrian - Proterozoic
485.4 - 2500 Ma

ID: 3192233
Precambrian-Phanerozoic crystalline metamorphic rocks

Age: to Cambrian (485.4 - 2500 Ma)

Comments: Alps

Lithology: Crystalline metamorphic 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 Macrostrat.org, used under Creative Commons Attribution 4.0 License


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Dal Piaz, G.V., and Govi, M. (1968) Lo stilpnomelano in Valle d'Aosta: nuovi ritrovamenti. Bollettino della Società Geologica Italiana, 87, 91-108.

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