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Groppera Alp, Madesimo, Sondrio Province, Lombardy, Italyi
| Regional Level Types | |
|---|---|
| Groppera Alp | Mountain |
| Madesimo | Municipality |
| Sondrio Province | Province |
| Lombardy | Region |
| Italy | Country |
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Latitude & Longitude (WGS84):
46° 25' 49'' North , 9° 22' 15'' East
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Madesimo | 401 (2014) | 1.3km |
| Fraciscio | 170 (2014) | 2.9km |
| Campodolcino | 645 (2014) | 3.4km |
| Prestone | 175 (2016) | 4.8km |
| San Giacomo Filippo | 211 (2014) | 10.3km |
Name(s) in local language(s):
Alpe Groppera, Madesimo, Valle Spluga (Valle San Giacomo), Valchiavenna, Sondrio, Lombardia, Italia
Mineralization in the "basal quartzite" of the Suretta nappe.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
5 valid minerals. 1 (TL) - type locality of valid minerals. 1 erroneous literature entry.
Detailed Mineral List:
| ⓘ Formula: Al2(SiO4)O Description: http://www.mindat.org/forum.php?read,105,308669,364058#msg-364058
In my opinion the mineral Kyanite has been added without any valid justification or by mistake.
Because:
1) the reported bibliographic reference "(Brugger J. (1996): The Fe, Mn, (V, Sb, As, Be, W) deposits of Val Ferrera (Graubünden, Switzerland). Unpublished PhD Thesis, Univ. Basel. 188 p." has nothing to do neither with the locality nor with the paragenesis in question.
2) I personally surveyed both Alpe Groppera and Torrente Scalcoggia collecting sites several times since their discovery in 1984, never observing any trace of kyanite, especially in macroscopic samples.
3) the posphates are hosted both in quartz rich layers and in mica rich layers of what appears to be a "low (green schists ?) metamorphic grade" meta-pelite \ meta-psammite interpreted to be part of the oldest (permo-triassic ??) sedimentary cover of the Suretta Nappe. Although not impossible the occurrence of Kyanite in such contest would be unsual, In addition the occurrence of pyrofillite at Torrente Scalcoggia is not in favour of the co-occurence of Kyanite (pyrophillite is replaced by Kyanite (or Andalusite) + Quartz at temperature higher than about 400°C.
I am not saying that is impossible to found some Kyanite, even in macroscopic samples not far from the described sites. That's because rock masses belonging to the "hercinian basement" outcrop not far from both sites. |
| ⓘ Lazulite Formula: MgAl2(PO4)2(OH)2 |
| ⓘ Rutile Formula: TiO2 |
| ⓘ Sigismundite (TL) Formula: (Ba◻)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2 Type Locality: Description: In phengitic quartz. |
| ⓘ Svanbergite Formula: SrAl3(PO4)(SO4)(OH)6 |
| ⓘ Woodhouseite Formula: CaAl3(PO4)(SO4)(OH)6 |
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Rutile | 4.DB.05 | TiO2 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Lazulite | 8.BB.40 | MgAl2(PO4)2(OH)2 |
| ⓘ | Sigismundite (TL) | 8.BF. | (Ba◻)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2 |
| ⓘ | Svanbergite | 8.BL.05 | SrAl3(PO4)(SO4)(OH)6 |
| ⓘ | Woodhouseite | 8.BL.05 | CaAl3(PO4)(SO4)(OH)6 |
| Group 9 - Silicates | |||
| ⓘ | Kyanite ? | 9.AF.15 | Al2(SiO4)O |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Lazulite | MgAl2(PO4)2(OH)2 |
| H | ⓘ Svanbergite | SrAl3(PO4)(SO4)(OH)6 |
| H | ⓘ Woodhouseite | CaAl3(PO4)(SO4)(OH)6 |
| H | ⓘ Sigismundite | (Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2 |
| O | Oxygen | |
| O | ⓘ Kyanite | Al2(SiO4)O |
| O | ⓘ Lazulite | MgAl2(PO4)2(OH)2 |
| O | ⓘ Rutile | TiO2 |
| O | ⓘ Svanbergite | SrAl3(PO4)(SO4)(OH)6 |
| O | ⓘ Woodhouseite | CaAl3(PO4)(SO4)(OH)6 |
| O | ⓘ Sigismundite | (Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2 |
| Na | Sodium | |
| Na | ⓘ Sigismundite | (Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2 |
| Mg | Magnesium | |
| Mg | ⓘ Lazulite | MgAl2(PO4)2(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Kyanite | Al2(SiO4)O |
| Al | ⓘ Lazulite | MgAl2(PO4)2(OH)2 |
| Al | ⓘ Svanbergite | SrAl3(PO4)(SO4)(OH)6 |
| Al | ⓘ Woodhouseite | CaAl3(PO4)(SO4)(OH)6 |
| Al | ⓘ Sigismundite | (Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Kyanite | Al2(SiO4)O |
| P | Phosphorus | |
| P | ⓘ Lazulite | MgAl2(PO4)2(OH)2 |
| P | ⓘ Svanbergite | SrAl3(PO4)(SO4)(OH)6 |
| P | ⓘ Woodhouseite | CaAl3(PO4)(SO4)(OH)6 |
| P | ⓘ Sigismundite | (Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2 |
| S | Sulfur | |
| S | ⓘ Svanbergite | SrAl3(PO4)(SO4)(OH)6 |
| S | ⓘ Woodhouseite | CaAl3(PO4)(SO4)(OH)6 |
| Ca | Calcium | |
| Ca | ⓘ Woodhouseite | CaAl3(PO4)(SO4)(OH)6 |
| Ca | ⓘ Sigismundite | (Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2 |
| Ti | Titanium | |
| Ti | ⓘ Rutile | TiO2 |
| Fe | Iron | |
| Fe | ⓘ Sigismundite | (Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2 |
| Sr | Strontium | |
| Sr | ⓘ Svanbergite | SrAl3(PO4)(SO4)(OH)6 |
| Ba | Barium | |
| Ba | ⓘ Sigismundite | (Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2 |
Other Regions, Features and Areas containing this locality
Eurasian PlateTectonic Plate
- AlpsAccretionary Complex
EuropeContinent
- The AlpsMountain Range
Italy
- Lombardy
- Sondrio Province
- ValchiavennaGroup of Valleies
- Spluga ValleyValley
- ValchiavennaGroup of Valleies
- Sondrio Province
Switzerland
- Grisons
- Albula Region
- Oberhalbstein AlpsMountain Range
- Albula Region
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References
Demartin, F., Gramaccioli, C. M., Pilati, T., Sciesa, E. (1996) Sigismundite, (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(OH)2(PO4)12, a new Ba-rich member of the arrojadite group from Spluga Valley, Italy. The Canadian Mineralogist, 34 (4) 827-834
Groppera Alp, Madesimo, Sondrio Province, Lombardy, Italy