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Groppera Alp, Madesimo, Sondrio Province, Lombardy, Italyi
Regional Level Types
Groppera AlpMountain
MadesimoMunicipality
Sondrio ProvinceProvince
LombardyRegion
ItalyCountry

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Key
Latitude & Longitude (WGS84):
46° 25' 49'' North , 9° 22' 15'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Madesimo401 (2014)1.3km
Fraciscio170 (2014)2.9km
Campodolcino645 (2014)3.4km
Prestone175 (2016)4.8km
San Giacomo Filippo211 (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 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+13Al(PO4)11(PO3OH)(OH)2
Type Locality:
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 Unpublished PhD Thesis, Univ.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
Rutile4.DB.05TiO2
Group 8 - Phosphates, Arsenates and Vanadates
Arrojadite-(BaFe) (TL)8.BF.05(Ba◻)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2
Lazulite8.BB.40MgAl2(PO4)2(OH)2
Svanbergite8.BL.05SrAl3(PO4)(SO4)(OH)6
Woodhouseite8.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, Mixtures, etc.
Arrojadite-(BaFe) (TL)-(Ba◻)(Fe2+◻)Ca(Na2◻)Fe2+13Al(PO4)11(PO3OH)(OH)2

List of minerals for each chemical element

HHydrogen
H Arrojadite-(BaFe)(Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2
H WoodhouseiteCaAl3(PO4)(SO4)(OH)6
H SvanbergiteSrAl3(PO4)(SO4)(OH)6
H LazuliteMgAl2(PO4)2(OH)2
OOxygen
O Arrojadite-(BaFe)(Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2
O WoodhouseiteCaAl3(PO4)(SO4)(OH)6
O SvanbergiteSrAl3(PO4)(SO4)(OH)6
O LazuliteMgAl2(PO4)2(OH)2
O RutileTiO2
O KyaniteAl2(SiO4)O
NaSodium
Na Arrojadite-(BaFe)(Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2
MgMagnesium
Mg LazuliteMgAl2(PO4)2(OH)2
AlAluminium
Al Arrojadite-(BaFe)(Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2
Al WoodhouseiteCaAl3(PO4)(SO4)(OH)6
Al SvanbergiteSrAl3(PO4)(SO4)(OH)6
Al LazuliteMgAl2(PO4)2(OH)2
Al KyaniteAl2(SiO4)O
SiSilicon
Si KyaniteAl2(SiO4)O
PPhosphorus
P Arrojadite-(BaFe)(Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2
P WoodhouseiteCaAl3(PO4)(SO4)(OH)6
P SvanbergiteSrAl3(PO4)(SO4)(OH)6
P LazuliteMgAl2(PO4)2(OH)2
SSulfur
S WoodhouseiteCaAl3(PO4)(SO4)(OH)6
S SvanbergiteSrAl3(PO4)(SO4)(OH)6
CaCalcium
Ca Arrojadite-(BaFe)(Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2
Ca WoodhouseiteCaAl3(PO4)(SO4)(OH)6
TiTitanium
Ti RutileTiO2
FeIron
Fe Arrojadite-(BaFe)(Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2
SrStrontium
Sr SvanbergiteSrAl3(PO4)(SO4)(OH)6
BaBarium
Ba Arrojadite-(BaFe)(Ba◻)(Fe2+◻)Ca(Na2◻)Fe132+Al(PO4)11(PO3OH)(OH)2

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.

External Links


Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate
EuropeContinent
Italy
Switzerland

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