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Petit Monde Tunnel, Montjovet, Aosta Valley, Italyi
Regional Level Types
Petit Monde TunnelTunnel
MontjovetCommune
Aosta ValleyAutonomous Region
Italy- not defined -

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05041760017272046834665.jpg
View from the north of the Petit Monde double-tube tunnel

Petit Monde Tunnel, Montjovet, Aosta Valley, Italy
05041760017272046834665.jpg
View from the north of the Petit Monde double-tube tunnel

Petit Monde Tunnel, Montjovet, Aosta Valley, Italy
03529680017272046866358.jpg
View from the north of the Petit Monde double-tube tunnel

Petit Monde Tunnel, Montjovet, Aosta Valley, Italy
Type:
Tunnel
Mindat Locality ID:
188770
Long-form identifier:
mindat:1:2:188770:2
GUID (UUID V4):
44d53a44-028c-4f69-bdf3-d91d26bf0c7a
Name(s) in local language(s):
Galleria del Petit Monde, Montjovet, Valle d'Aosta, Italia


The Petit Monde double-tube tunnel of the A5 Turin-Aosta motorway, built in the second half of the 1960s, penetrates a large mass of serpentinite on the left side of River Dora Baltea. The northern tube is 379 m long, the southern one - 832 m.

Abundant carbonates (aragonite, artinite, coalingite, hydromagnesite, and possible cyanotrichite) were found near the southern portal of the northern tube in a highly altered and fractured serpentinite (Ratto & Gramaccioli, 1967; Castello, 1978; and other authors). Furthermore, a lens of light rodingite was discovered along the service road outside the southern portal.

Rodingite bodies were found inside both tubes: some veinlets in the southern tube at about 170 m from the northern portal; a large dyke 60-70 cm thick in the northern tube at about 150 m from the northern portal. All these rodingites consist of pink and green garnet, chlorite, diopside, vesuvianite, clinozoisite, and carbonate. Some greenish vesuvianite crystals up to 7 cm in lenght were found here. A gray-greenish chlorite rim (whith subordinate diopside, titanite, and garnet) separates the rodingite bodies from the embedding chlorite schists (Dal Piaz & Grasso, 1967). Pink garnet is grossular with empirical formula(Ca2.37Mg0.39Mn0.12Fe0.10)(Al1.88Fe0.15)(Si2.83Al0.17)012; bright green garnet has a magnesiochromite core and is a Cr-bearing andradite with empirical formula(Ca2.49Mg0.29Mn0.20)(Fe1.15Al0.63Cr0.25)(Si2.90Al0.10)012 (Franchini Angela & Ferraris, 1971).

In the area outside the Petit Monde tunnel, other rodingite dykes in serpentinite have been found.



Note: sometimes, minerals from this area, located in the municipal territory of Montjovet but more easily reachable from Saint-Vincent, are labelled as from Saint-Vincent.

Select Mineral List Type

StandardDetailedGalleryStrunzChemical Elements

Mineral List


13 valid minerals. 1 erroneous literature entry.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical ListTree Diagram

Detailed Mineral List:

ⓘAndradite
Formula:Ca3Fe3+2(SiO4)3
Description: Cr-bearing variety as bright green crystals with a magnesiochromite core. Empirical formula: (Ca2.49Mg0.29Mn0.20)(Fe1.15Al0.63Cr0.25)(Si2.90Al0.10)O12.
ⓘAndradite var. Demantoid
Formula:Ca3Fe3+2(SiO4)3
ⓘAragonite
Formula:CaCO3
ⓘArtinite
Formula:Mg2(CO3)(OH)2 · 3H2O
ⓘBrugnatellite
Formula:Mg6Fe3+(CO3)(OH)13 · 4H2O
Description: According to a personal communication of G. Ferraris in Piccoli et. al. (2007), all performed analyses show the presense of coalingite only.
ⓘ'Chlorite Group'
ⓘClinozoisite
Formula:(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
ⓘCoalingite
Formula:Mg10Fe3+2(OH)24[CO3] · 2H2O
ⓘCyanotrichite ?
Formula:Cu4Al2(SO4)(OH)12 · 2H2O
Description: As thin blue incrustations in association with artinite.
ⓘDiopside
Formula:CaMgSi2O6
ⓘGrossular
Formula:Ca3Al2(SiO4)3
ⓘHydromagnesite
Formula:Mg5(CO3)4(OH)2 · 4H2O
ⓘMagnesiochromite
Formula:MgCr2O4
ⓘPyroaurite ?
Formula:Mg6Fe3+2(OH)16[CO3] · 4H2O
ⓘTitanite
Formula:CaTi(SiO4)O
ⓘVesuvianite
Formula:Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘMagnesiochromite4.BB.05MgCr2O4
Group 5 - Nitrates and Carbonates
ⓘAragonite5.AB.15CaCO3
ⓘHydromagnesite5.DA.05Mg5(CO3)4(OH)2 · 4H2O
ⓘArtinite5.DA.10Mg2(CO3)(OH)2 · 3H2O
ⓘBrugnatellite ?5.DA.45Mg6Fe3+(CO3)(OH)13 · 4H2O
ⓘPyroaurite ?5.DA.50Mg6Fe3+2(OH)16[CO3] · 4H2O
ⓘCoalingite5.DA.55Mg10Fe3+2(OH)24[CO3] · 2H2O
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘCyanotrichite ?7.DE.10Cu4Al2(SO4)(OH)12 · 2H2O
Group 9 - Silicates
ⓘAndradite9.AD.25Ca3Fe3+2(SiO4)3
ⓘvar. Demantoid9.AD.25Ca3Fe3+2(SiO4)3
ⓘGrossular9.AD.25Ca3Al2(SiO4)3
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘClinozoisite9.BG.05a(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
ⓘVesuvianite9.BG.35Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
ⓘDiopside9.DA.15CaMgSi2O6
Unclassified
ⓘ'Chlorite Group'-

List of minerals for each chemical element

HHydrogen
HⓘArtiniteMg2(CO3)(OH)2 · 3H2O
HⓘBrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2O
HⓘClinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
HⓘCoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
HⓘCyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
HⓘHydromagnesiteMg5(CO3)4(OH)2 · 4H2O
HⓘPyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
HⓘVesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
CCarbon
CⓘAragoniteCaCO3
CⓘArtiniteMg2(CO3)(OH)2 · 3H2O
CⓘBrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2O
CⓘCoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
CⓘHydromagnesiteMg5(CO3)4(OH)2 · 4H2O
CⓘPyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
OOxygen
OⓘAndraditeCa3Fe23+(SiO4)3
OⓘAragoniteCaCO3
OⓘArtiniteMg2(CO3)(OH)2 · 3H2O
OⓘBrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2O
OⓘClinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
OⓘCoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
OⓘCyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
OⓘAndradite var.DemantoidCa3Fe23+(SiO4)3
OⓘDiopsideCaMgSi2O6
OⓘGrossularCa3Al2(SiO4)3
OⓘHydromagnesiteMg5(CO3)4(OH)2 · 4H2O
OⓘMagnesiochromiteMgCr2O4
OⓘPyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
OⓘTitaniteCaTi(SiO4)O
OⓘVesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
MgMagnesium
MgⓘArtiniteMg2(CO3)(OH)2 · 3H2O
MgⓘBrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2O
MgⓘCoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
MgⓘDiopsideCaMgSi2O6
MgⓘHydromagnesiteMg5(CO3)4(OH)2 · 4H2O
MgⓘMagnesiochromiteMgCr2O4
MgⓘPyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
MgⓘVesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
AlAluminium
AlⓘClinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
AlⓘCyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
AlⓘGrossularCa3Al2(SiO4)3
AlⓘVesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
SiSilicon
SiⓘAndraditeCa3Fe23+(SiO4)3
SiⓘClinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
SiⓘAndradite var.DemantoidCa3Fe23+(SiO4)3
SiⓘDiopsideCaMgSi2O6
SiⓘGrossularCa3Al2(SiO4)3
SiⓘTitaniteCaTi(SiO4)O
SiⓘVesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
SSulfur
SⓘCyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
CaCalcium
CaⓘAndraditeCa3Fe23+(SiO4)3
CaⓘAragoniteCaCO3
CaⓘClinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
CaⓘAndradite var.DemantoidCa3Fe23+(SiO4)3
CaⓘDiopsideCaMgSi2O6
CaⓘGrossularCa3Al2(SiO4)3
CaⓘTitaniteCaTi(SiO4)O
CaⓘVesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
TiTitanium
TiⓘTitaniteCaTi(SiO4)O
CrChromium
CrⓘMagnesiochromiteMgCr2O4
FeIron
FeⓘAndraditeCa3Fe23+(SiO4)3
FeⓘBrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2O
FeⓘCoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
FeⓘAndradite var.DemantoidCa3Fe23+(SiO4)3
FeⓘPyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
FeⓘVesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
CuCopper
CuⓘCyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O

Fossils

This region is too big or complex to display the fossil list, try looking at smaller subregions.
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, pleaseregister so you can add to our database. This locality information is for reference purposes only. You should never attempt tovisit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holdersfor access and that you are aware of all safety precautions necessary.

References

Dal Piaz, G.V., and Grasso, F. (1967) Le rodingiti l.s. nelle gallerie «Petit Monde» della autostrada Quincinetto-Aosta. Bollettino della Società Geologica Italiana, 86, 395-401
Ratto, A., and Gramaccioli, C.M. (1967) Ritrovamento di artinite a Saint Vincent (Val d'Aosta). Natura, 58, 4, 309-310
Ferraris, G. (1971) Novità piemontesi (coalingite e todorokite). Notiziario del Gruppo Mineralogico Piemontese, 3, 15
Franchini Angela, M., and Ferraris, G . (1971) Ricerche su granati delle rodingiti di Montjovet (Val d'Aosta). Atti dell'Accademia delle Scienze di Torino, 105, 14-22
Gramaccioli, C.M. (1975) Minerali alpini e prealpini. Istituto Italiano Edizioni Atlas, Bergamo, 2 vol., 472 pages
Castello, P. (1978) Informazioni di mineralogia valdostana. Minerali delle serpentine e delle rodingiti di Châtillon e Montjovet. Revue Valdôtaine d'Histoire Naturelle, 32, 95-99
Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007)Minerali del Piemonte e della Valle d'Aosta - Associazione Amici del Museo "F. Eusebio" Alba.
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