SUPPORT US. If mindat.org is important to you, click here to donate to our Fall 2019 fundraiser!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Polluce (Pollux), Champoluc, Ayas, Aosta Valley, Italyi
Regional Level Types
Polluce (Pollux)- not defined -
Champoluc- not defined -
AyasCommune
Aosta ValleyAutonomous Region
ItalyCountry

This page is currently not sponsored. Click here to sponsor this page.
Key
Latitude & Longitude (WGS84):
45° North , 7° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~10km
Köppen climate type:
Name(s) in local language(s):
Polluce (Pollux), Champoluc, Ayas, Val d'Ayas, Valle d'Aosta (Vallée d'Aoste), Italia


Polluce (4092 m a.s.l.), whose name in French and German is Pollux, is located on the border between Aosta Valley (Italy) and Valais (Switzerland). It is the lower of a pair of twin peaks, known as "I Gemelli" (Italian), "Die Zwillinge" (German) or "Les Jumeaux" (French), the other being Castore (Castor), named after the Gemini twins of Greco-Roman mithology. It is separated from Castor (4223 m) by Passo di Verra (Pas de Verra) or Zwillingsjoch (3845 m), to the southeast, and from Roccia Nera or Schwarzfluh (4075 m) by Porta Nera (Porte Noire) or Schwarztor (3725 m), to the northwest.

The Italian side of Polluce/Pollux is almost completely made of magnetite-bearing antigorite serpentinite (ophiolitic Zermatt-Saas nappe) with lenses and veins rich in reddish titanclinohumite, diopside, and olivine (forsterite). Serpentinite is in tectonic contact with amphibolite (Monte Rosa nappe), sometimes rich in epidote, at the base of the southeast crest and just above the terminal glacier crevasse on the south slope. A rodingite lens crops out on the orographic left of the steep couloir on the west slope; numerous rodingite bodies, varying in thinckness from decimetres to 4 metre, are present on the rocky south face, between its base and the top of the shoulder at 3991 m. Metarodingitic bodies are usually mantled by a thin chlorite rim and associated with garnet-bearing metagabbro, rich in epidote veins.

The presence in this area of crystals of red garnet, red-brown vesuvianite, green diopside, and prehnite was already reported by Hintze (1897). According to Güller (1947) and Dal Piaz (1967), garnet and diopside crystals in rodingite fissures and cavities are accompanied by clinochlore, vesuvianite, epidote, prehnite, and calcite. Grossular-rich garnet forms splendid crystals, ranging from pinkish to dark red; epidote appears as yellow to olive-green crystals up to 1 cm long, sometimes in association with white icositetrahedral crystals of analcime.

Minerals reported from the Swiss side are listed separately (see http://www.mindat.org/loc-121017.html).

Regions containing this locality

Eurasian PlateTectonic Plate
EuropeContinent
The Alps, EuropeMountain Range

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


13 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Dal Piaz, G.V. (1966) Gneiss ghiandoni, marmi ed anfiboliti antiche del ricoprimento Monte Rosa nell'Alta Valle d'Ayas. Bollettino della Società Geologica Italiana, 85, 1, 103-132.
'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Reference: Dal Piaz, G.V. (1966) Gneiss ghiandoni, marmi ed anfiboliti antiche del ricoprimento Monte Rosa nell'Alta Valle d'Ayas. Bollettino della Società Geologica Italiana, 85, 1, 103-132; Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313.
Analcime
Formula: Na(AlSi2O6) · H2O
Reference: 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.
Antigorite
Formula: Mg3(Si2O5)(OH)4
Reference: Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313.
Calcite
Formula: CaCO3
Reference: Güller, A. (1947) Zur Geologie der südlichen Mischabel- und der Monte Rosa-Gruppe. Eclogae Geologicae Helvetiae, 40, 39-161; Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313.
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Güller, A. (1947) Zur Geologie der südlichen Mischabel- und der Monte Rosa-Gruppe. Eclogae Geologicae Helvetiae, 40, 39-161; Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313; 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.
Clinohumite
Formula: Mg9(SiO4)4F2
Reference: Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313.
Clinohumite var: Titanclinohumite
Formula: Mg9(SiO4)4F2
Reference: Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313.
Diopside
Formula: CaMgSi2O6
Reference: Hintze, C. (1897) Handbuch der Mineralogie. Zweiter Band, Silicate und Titanate. Verlag von Veit & Comp., Leipzig, 1841 pp.; Güller, A. (1947) Zur Geologie der südlichen Mischabel- und der Monte Rosa-Gruppe. Eclogae Geologicae Helvetiae, 40, 39-161; Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Dal Piaz, G.V. (1966) Gneiss ghiandoni, marmi ed anfiboliti antiche del ricoprimento Monte Rosa nell'Alta Valle d'Ayas. Bollettino della Società Geologica Italiana, 85, 1, 103-132; Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313; 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.
Forsterite
Formula: Mg2SiO4
Reference: Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313.
Grossular
Formula: Ca3Al2(SiO4)3
Reference: Hintze, C. (1897) Handbuch der Mineralogie. Zweiter Band, Silicate und Titanate. Verlag von Veit & Comp., Leipzig, 1841 pp.; Güller, A. (1947) Zur Geologie der südlichen Mischabel- und der Monte Rosa-Gruppe. Eclogae Geologicae Helvetiae, 40, 39-161; Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313; 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.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313.
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Reference: Hintze, C. (1897) Handbuch der Mineralogie. Zweiter Band, Silicate und Titanate. Verlag von Veit & Comp., Leipzig, 1841 pp.; Güller, A. (1947) Zur Geologie der südlichen Mischabel- und der Monte Rosa-Gruppe. Eclogae Geologicae Helvetiae, 40, 39-161; Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313.
Vesuvianite
Formula: (Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Reference: Hintze, C. (1897) Handbuch der Mineralogie. Zweiter Band, Silicate und Titanate. Verlag von Veit & Comp., Leipzig, 1841 pp.; Güller, A. (1947) Zur Geologie der südlichen Mischabel- und der Monte Rosa-Gruppe. Eclogae Geologicae Helvetiae, 40, 39-161; Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Analcime9.GB.05Na(AlSi2O6) · H2O
Antigorite9.ED.15Mg3(Si2O5)(OH)4
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
Clinohumite9.AF.55Mg9(SiO4)4F2
var: Titanclinohumite9.AF.55Mg9(SiO4)4F2
Diopside9.DA.15CaMgSi2O6
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Forsterite9.AC.05Mg2SiO4
Grossular9.AD.25Ca3Al2(SiO4)3
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Vesuvianite9.BG.35(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Unclassified Minerals, Rocks, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2

List of minerals arranged by Dana 8th Edition classification

Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Forsterite51.3.1.2Mg2SiO4
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Grossular51.4.3b.2Ca3Al2(SiO4)3
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Clinohumite52.3.2d.1Mg9(SiO4)4F2
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Vesuvianite58.2.4.1(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Antigorite71.1.2a.1Mg3(Si2O5)(OH)4
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Prehnite72.1.3.1Ca2Al2Si3O10(OH)2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Unclassified Minerals, Mixtures, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Clinohumite
var: Titanclinohumite
-Mg9(SiO4)4F2

List of minerals for each chemical element

HHydrogen
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H ClinochloreMg5Al(AlSi3O10)(OH)8
H Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
H PrehniteCa2Al2Si3O10(OH)2
H AntigoriteMg3(Si2O5)(OH)4
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H AnalcimeNa(AlSi2O6) · H2O
BBoron
B Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
CCarbon
C CalciteCaCO3
OOxygen
O GrossularCa3Al2(SiO4)3
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O DiopsideCaMgSi2O6
O ClinochloreMg5Al(AlSi3O10)(OH)8
O Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
O PrehniteCa2Al2Si3O10(OH)2
O CalciteCaCO3
O AntigoriteMg3(Si2O5)(OH)4
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O MagnetiteFe2+Fe23+O4
O ForsteriteMg2SiO4
O Clinohumite (var: Titanclinohumite)Mg9(SiO4)4F2
O ClinohumiteMg9(SiO4)4F2
O AlbiteNa(AlSi3O8)
O AnalcimeNa(AlSi2O6) · H2O
FFluorine
F Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
F Clinohumite (var: Titanclinohumite)Mg9(SiO4)4F2
F ClinohumiteMg9(SiO4)4F2
NaSodium
Na Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Na AlbiteNa(AlSi3O8)
Na AnalcimeNa(AlSi2O6) · H2O
MgMagnesium
Mg DiopsideCaMgSi2O6
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Mg AntigoriteMg3(Si2O5)(OH)4
Mg ForsteriteMg2SiO4
Mg Clinohumite (var: Titanclinohumite)Mg9(SiO4)4F2
Mg ClinohumiteMg9(SiO4)4F2
AlAluminium
Al GrossularCa3Al2(SiO4)3
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Al PrehniteCa2Al2Si3O10(OH)2
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al AlbiteNa(AlSi3O8)
Al AnalcimeNa(AlSi2O6) · H2O
SiSilicon
Si GrossularCa3Al2(SiO4)3
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si DiopsideCaMgSi2O6
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Si PrehniteCa2Al2Si3O10(OH)2
Si AntigoriteMg3(Si2O5)(OH)4
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si ForsteriteMg2SiO4
Si Clinohumite (var: Titanclinohumite)Mg9(SiO4)4F2
Si ClinohumiteMg9(SiO4)4F2
Si AlbiteNa(AlSi3O8)
Si AnalcimeNa(AlSi2O6) · H2O
ClChlorine
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
CaCalcium
Ca GrossularCa3Al2(SiO4)3
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca DiopsideCaMgSi2O6
Ca Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Ca PrehniteCa2Al2Si3O10(OH)2
Ca CalciteCaCO3
TiTitanium
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
FeIron
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Fe MagnetiteFe2+Fe23+O4

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Hintze, C. (1897) Handbuch der Mineralogie. Zweiter Band, Silicate und Titanate. Verlag von Veit & Comp., Leipzig, 1841 pp.
Güller, A. (1947) Zur Geologie der südlichen Mischabel- und der Monte Rosa-Gruppe. Eclogae Geologicae Helvetiae, 40, 39-161.
Dal Piaz, G.V. (1965) La formazione mesozoica dei calcescisti con pietre verdi fra la Valsesia e la Valtournanche ed i suoi rapporti strutturali con il ricoprimento Monte Rosa e con la zona Sesia-Lanzo. Bollettino della Società Geologica Italiana, 84, 1, 67-104.
Dal Piaz, G.V. (1966) Gneiss ghiandoni, marmi ed anfiboliti antiche del ricoprimento Monte Rosa nell'Alta Valle d'Ayas. Bollettino della Società Geologica Italiana, 85, 1, 103-132.
Dal Piaz, G.V. (1967) Le "granatiti" (rodingiti l.s.) nelle serpentine delle Alpi occidentali italiane. Memorie della Società Geologica Italiana, 6, 267-313.
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.


This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.
 
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 18, 2019 20:38:22 Page generated: June 24, 2019 15:47:10
Go to top of page