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Groppera Alp, Madesimo, Spluga Valley (San Giacomo Valley), Valchiavenna, Sondrio Province, Lombardy, Italy

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Name(s) in local language(s):Alpe Groppera, Madesimo, Valle Spluga (Valle San Giacomo), Valchiavenna, Sondrio, Lombardia, Italia
Latitude & Longitude (WGS84): 46° 25' 49'' North , 9° 22' 15'' East
Latitude & Longitude (decimal): 46.43045,9.37085
GeoHash:G#: u0q8jhrsu
Locality type:Mountain
Köppen climate type:Dfc : Subarctic climate


Mineralization in the "basal quartzite" of the Suretta nappe.

Regions containing this locality

The Alps, Europe

Mountain Range - 2,240 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals. 1 (TL) - type locality of valid minerals. 1 erroneous literature entry.

Detailed Mineral List:

Arrojadite-(BaFe) (TL)
Formula: {Ba◻}{Fe2+◻}{Ca}{Na2◻}{Fe2+13}{Al}(PO4)11(HPO4)(OH)2
Description: In phengitic quartz.
Reference: 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. Canadian Mineralogist, 34, 827-834.
Kyanite
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 Unpublished PhD Thesis, Univ.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.
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.
Lazulite
Formula: MgAl2(PO4)2(OH)2
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.
Rutile
Formula: TiO2
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.
Svanbergite
Formula: SrAl3(PO4)(SO4)(OH)6
Reference: 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. Canadian Mineralogist, 34, 827-834.
Woodhouseite
Formula: CaAl3(PO4)(SO4)(OH)6
Reference: 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. Canadian Mineralogist, 34, 827-834.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Rutile'4.DB.05TiO2
Group 8 - Phosphates, Arsenates and Vanadates
'Arrojadite-(BaFe)' (TL)8.BF.05{Ba◻}{Fe2+◻}{Ca}{Na2◻}{Fe2+13}{Al}(PO4)11(HPO4)(OH)2
'Lazulite'8.BB.40MgAl2(PO4)2(OH)2
'Svanbergite'8.BL.05SrAl3(PO4)(SO4)(OH)6
'Woodhouseite'8.BL.05CaAl3(PO4)(SO4)(OH)6
Group 9 - Silicates
'Kyanite' ?9.AF.15Al2(SiO4)O

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
AX2
Rutile4.4.1.1TiO2
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)3(XO4)2Zq
Lazulite41.10.1.1MgAl2(PO4)2(OH)2
Group 43 - COMPOUND PHOSPHATES, ETC.
Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
Svanbergite43.4.1.6SrAl3(PO4)(SO4)(OH)6
Woodhouseite43.4.1.8CaAl3(PO4)(SO4)(OH)6
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Kyanite ?52.2.2c.1Al2(SiO4)O
Unclassified Minerals, Rocks, etc.
Arrojadite-(BaFe) (TL)-{Ba◻}{Fe2+◻}{Ca}{Na2◻}{Fe2+13}{Al}(PO4)11(HPO4)(OH)2

List of minerals for each chemical element

HHydrogen
H Arrojadite-(BaFe){Ba◻}{Fe2+◻}{Ca}{Na2◻}{Fe132+}{Al}(PO4)11(HPO4)(OH)2
H LazuliteMgAl2(PO4)2(OH)2
H SvanbergiteSrAl3(PO4)(SO4)(OH)6
H WoodhouseiteCaAl3(PO4)(SO4)(OH)6
OOxygen
O Arrojadite-(BaFe){Ba◻}{Fe2+◻}{Ca}{Na2◻}{Fe132+}{Al}(PO4)11(HPO4)(OH)2
O KyaniteAl2(SiO4)O
O LazuliteMgAl2(PO4)2(OH)2
O RutileTiO2
O SvanbergiteSrAl3(PO4)(SO4)(OH)6
O WoodhouseiteCaAl3(PO4)(SO4)(OH)6
NaSodium
Na Arrojadite-(BaFe){Ba◻}{Fe2+◻}{Ca}{Na2◻}{Fe132+}{Al}(PO4)11(HPO4)(OH)2
MgMagnesium
Mg LazuliteMgAl2(PO4)2(OH)2
AlAluminium
Al Arrojadite-(BaFe){Ba◻}{Fe2+◻}{Ca}{Na2◻}{Fe132+}{Al}(PO4)11(HPO4)(OH)2
Al KyaniteAl2(SiO4)O
Al LazuliteMgAl2(PO4)2(OH)2
Al SvanbergiteSrAl3(PO4)(SO4)(OH)6
Al WoodhouseiteCaAl3(PO4)(SO4)(OH)6
SiSilicon
Si KyaniteAl2(SiO4)O
PPhosphorus
P Arrojadite-(BaFe){Ba◻}{Fe2+◻}{Ca}{Na2◻}{Fe132+}{Al}(PO4)11(HPO4)(OH)2
P LazuliteMgAl2(PO4)2(OH)2
P SvanbergiteSrAl3(PO4)(SO4)(OH)6
P WoodhouseiteCaAl3(PO4)(SO4)(OH)6
SSulfur
S SvanbergiteSrAl3(PO4)(SO4)(OH)6
S WoodhouseiteCaAl3(PO4)(SO4)(OH)6
CaCalcium
Ca Arrojadite-(BaFe){Ba◻}{Fe2+◻}{Ca}{Na2◻}{Fe132+}{Al}(PO4)11(HPO4)(OH)2
Ca WoodhouseiteCaAl3(PO4)(SO4)(OH)6
TiTitanium
Ti RutileTiO2
FeIron
Fe Arrojadite-(BaFe){Ba◻}{Fe2+◻}{Ca}{Na2◻}{Fe132+}{Al}(PO4)11(HPO4)(OH)2
SrStrontium
Sr SvanbergiteSrAl3(PO4)(SO4)(OH)6
BaBarium
Ba Arrojadite-(BaFe){Ba◻}{Fe2+◻}{Ca}{Na2◻}{Fe132+}{Al}(PO4)11(HPO4)(OH)2

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

Unknown
Ma



ID: 2366036
Metamorphe Gesteine, meist Metasedimente

Age: Anthropocene ( Ma)

Lithology: Gneiss and mica schist

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

Triassic
201.3 - 251.902 Ma



ID: 3159302
Jura moutains, Penninic nappes, Austroalpine nappes, Southern Alpes

Age: Triassic (201.3 - 251.902 Ma)

Description: low grade metamorphic

Lithology: Meta-sediment group

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: 3189284
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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Bedogné, F., Maurizio, R., Montrasio, A. & Sciesa, E. (1995): I Minerali Della Provincia Di Sondrio e Della Bregaglia Grigionese: Val Bregaglia, Val Masino, Val Codera E Valle Spluga. Bettini, Sondrio, Italia, 300 pp
- 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. Canadian Mineralogist, 34, 827-834.
??
- Brugger J. (1996): The Fe, Mn, (V, Sb, As, Be, W) deposits of Val Ferrera (Graubünden, Switzerland). Unpublished PhD Thesis, Univ. Basel. 188 p.
??
- Cámara, F., Oberti, R., Chopin, C., Medenbach, O. (2006): The arrojadite enigma: I. A new formula and a new model for the arrojadite structure. American Mineralogist, 91, 1249-1259.
- Chopin, C., Oberti, R., Cámara, F. (2006): The arrojadite enigma: II. Compositional space, new members and nomenclature of the group. American Mineralogist, 91, 1260-1270.

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