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Borgo peridotite outcrop, Livo, Como Province, Lombardy, Italyi
Regional Level Types
Borgo peridotite outcropOutcrop
LivoCommune
Como ProvinceProvince
LombardyRegion
ItalyCountry

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Latitude & Longitude (WGS84):
46° 12' 51'' North , 9° 17' 58'' East
Latitude & Longitude (decimal):
46.21422,9.29947
GeoHash:
G#:u0nwgt59m
GRN:
N31E05
Type:
Outcrop
Köppen climate type:
Dfc : Subarctic climate
Nearest Settlements:
PlacePopulationDistance
Livo208(2014)5.1km
Dosso del Liro275(2014)5.9km
Peglio197(2014)6.0km
Trezzone202(2012)6.2km
Aurogna220(2014)6.4km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Club Cercatori di Minerali e Fossili TicinoViganello, Ticino34km
Mindat Locality ID:
411637
Long-form identifier:
mindat:1:2:411637:3
GUID (UUID V4):
0
Other Languages:
Italian:
Affioramento di peridotite di Borgo, Livo, Provincia di Como, Lombardia, Italia


Peridotite outcrop along the Ledù stream, in front of the hamlet of Borgo.

At Borgo, a kilometre-sized peridotite body is in contact with amphibole-bearing migmatites with preserved boudins of mafic eclogite. The peridotite body and its mafic rim are hosted within migmatitic gneisses. In the peridotite body, garnet was not observed, but rounded chlorite-rich pseudomorphs that probably formed after garnet porphyroclasts are abundant; millimetre- to centimetre-sized pyrope garnet (up to 3 cm), often partially replaced by chlorite and/or kelyphite, has been found in nearby loose blocks downstream in the Ledù streambed. In the Borgo body, compositional layering marked by chlorite-rich and chlorite-poor layers represents the main fabric element at the mesoscale. The contact between the peridotite and hosting crustal rocks is characterized by the occurrence of a decimetre-thick metasomatic rim rich in amphibole and phlogopite. Lenses rich in amphibole and phlogopite have been also found as centimetre-sized boudins embedded in the surrounding mafic rocks. A phlogopite-rich pegmatite intruded the peridotite–mafic rocks contact and is folded together with chlorite-defined foliation in the peridotite and the main foliation of the hosting mafic gneiss. The heterogeneous rock association constituting the rim of the peridotite body consists chiefly of amphibole-bearing migmatitic gneiss with boudins of eclogite that show differences in terms of their mineralogy and deformation intensity. Fine-grained, partially retrogressed, dark green eclogites occur as boudins (decimetres to metres in size) included in gneisses. A second type of eclogite occurs in larger, light green-coloured boudins. The contact between the second type of eclogite and the surrounding gneisses is locally marked by millimetre-sized layers in which centimetre-sized crystals of emerald-green zoisite surrounded by reddish coronae have been found (Tumiati et al., 2018).

Select Mineral List Type

StandardDetailedGalleryStrunzChemical Elements

Detailed Mineral List:

ⓘAlbite
Formula:Na(AlSi3O8)
ⓘAlmandine
Formula:Fe2+3Al2(SiO4)3
ⓘ'Amphibole Supergroup'
Formula:AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘAnorthite
Formula:Ca(Al2Si2O8)
ⓘAnthophyllite
Formula:◻{Mg2}{Mg5}(Si8O22)(OH)2
ⓘ'Apatite'
Formula:Ca5(PO4)3(Cl/F/OH)
ⓘ'Chlorite Group'
ⓘ'Clinopyroxene Subgroup'
ⓘCorundum
Formula:Al2O3
ⓘDiopside
Formula:CaMgSi2O6
ⓘDolomite
Formula:CaMg(CO3)2
ⓘEnstatite
Formula:Mg2Si2O6
ⓘForsterite
Formula:Mg2SiO4
ⓘ'Garnet Group'
Formula:X3Z2(SiO4)3
ⓘIlmenite
Formula:Fe2+TiO3
ⓘ'K Feldspar'
ⓘKyanite
Formula:Al2(SiO4)O
ⓘLaumontite
Formula:CaAl2Si4O12 · 4H2O
ⓘMargarite
Formula:CaAl2(Al2Si2O10)(OH)2
ⓘOmphacite
Formula:(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6
ⓘPentlandite
Formula:(NixFey)Σ9S8
ⓘPhlogopite
Formula:KMg3(AlSi3O10)(OH)2
ⓘPyrope
Formula:Mg3Al2(SiO4)3
ⓘPyrrhotite
Formula:Fe1-xS
ⓘQuartz
Formula:SiO2
ⓘRutile
Formula:TiO2
ⓘSapphirine
Formula:Mg4(Mg3Al9)O4[Si3Al9O36]
ⓘ'Serpentine Subgroup'
Formula:D3[Si2O5](OH)4
ⓘSpinel
Formula:MgAl2O4
ⓘZircon
Formula:Zr(SiO4)
ⓘZoisite
Formula:(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘPentlandite2.BB.15(NixFey)Σ9S8
ⓘPyrrhotite2.CC.10Fe1-xS
Group 4 - Oxides and Hydroxides
ⓘSpinel4.BB.05MgAl2O4
ⓘCorundum4.CB.05Al2O3
ⓘIlmenite4.CB.05Fe2+TiO3
ⓘQuartz4.DA.05SiO2
ⓘRutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
ⓘDolomite5.AB.10CaMg(CO3)2
Group 9 - Silicates
ⓘForsterite9.AC.05Mg2SiO4
ⓘAlmandine9.AD.25Fe2+3Al2(SiO4)3
ⓘPyrope9.AD.25Mg3Al2(SiO4)3
ⓘZircon9.AD.30Zr(SiO4)
ⓘKyanite9.AF.15Al2(SiO4)O
ⓘZoisite9.BG.10(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
ⓘEnstatite9.DA.05Mg2Si2O6
ⓘDiopside9.DA.15CaMgSi2O6
ⓘOmphacite9.DA.20(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6
ⓘAnthophyllite9.DD.05◻{Mg2}{Mg5}(Si8O22)(OH)2
ⓘSapphirine9.DH.45Mg4(Mg3Al9)O4[Si3Al9O36]
ⓘPhlogopite9.EC.20KMg3(AlSi3O10)(OH)2
ⓘMargarite9.EC.30CaAl2(Al2Si2O10)(OH)2
ⓘAlbite9.FA.35Na(AlSi3O8)
ⓘAnorthite9.FA.35Ca(Al2Si2O8)
ⓘLaumontite9.GB.10CaAl2Si4O12 · 4H2O
Unclassified
ⓘ'Amphibole Supergroup'-AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘ'Chlorite Group'-
ⓘ'Clinopyroxene Subgroup'-
ⓘ'K Feldspar'-
ⓘ'Garnet Group'-X3Z2(SiO4)3
ⓘ'Serpentine Subgroup'-D3[Si2O5](OH)4
ⓘ'Apatite'-Ca5(PO4)3(Cl/F/OH)

List of minerals for each chemical element

HHydrogen
HⓘAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
HⓘAnthophyllite◻{Mg2}{Mg5}(Si8O22)(OH)2
HⓘLaumontiteCaAl2Si4O12 · 4H2O
HⓘMargariteCaAl2(Al2Si2O10)(OH)2
HⓘPhlogopiteKMg3(AlSi3O10)(OH)2
HⓘZoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
HⓘSerpentine SubgroupD3[Si2O5](OH)4
HⓘApatiteCa5(PO4)3(Cl/F/OH)
CCarbon
CⓘDolomiteCaMg(CO3)2
OOxygen
OⓘAlbiteNa(AlSi3O8)
OⓘAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
OⓘAnorthiteCa(Al2Si2O8)
OⓘAnthophyllite◻{Mg2}{Mg5}(Si8O22)(OH)2
OⓘAlmandineFe32+Al2(SiO4)3
OⓘCorundumAl2O3
OⓘDiopsideCaMgSi2O6
OⓘDolomiteCaMg(CO3)2
OⓘEnstatiteMg2Si2O6
OⓘForsteriteMg2SiO4
OⓘIlmeniteFe2+TiO3
OⓘKyaniteAl2(SiO4)O
OⓘLaumontiteCaAl2Si4O12 · 4H2O
OⓘMargariteCaAl2(Al2Si2O10)(OH)2
OⓘOmphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
OⓘPhlogopiteKMg3(AlSi3O10)(OH)2
OⓘPyropeMg3Al2(SiO4)3
OⓘQuartzSiO2
OⓘRutileTiO2
OⓘSapphirineMg4(Mg3Al9)O4[Si3Al9O36]
OⓘSpinelMgAl2O4
OⓘZirconZr(SiO4)
OⓘZoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
OⓘGarnet GroupX3Z2(SiO4)3
OⓘSerpentine SubgroupD3[Si2O5](OH)4
OⓘApatiteCa5(PO4)3(Cl/F/OH)
FFluorine
FⓘAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
FⓘApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
NaⓘAlbiteNa(AlSi3O8)
NaⓘOmphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
MgMagnesium
MgⓘAnthophyllite◻{Mg2}{Mg5}(Si8O22)(OH)2
MgⓘDiopsideCaMgSi2O6
MgⓘDolomiteCaMg(CO3)2
MgⓘEnstatiteMg2Si2O6
MgⓘForsteriteMg2SiO4
MgⓘOmphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
MgⓘPhlogopiteKMg3(AlSi3O10)(OH)2
MgⓘPyropeMg3Al2(SiO4)3
MgⓘSapphirineMg4(Mg3Al9)O4[Si3Al9O36]
MgⓘSpinelMgAl2O4
AlAluminium
AlⓘAlbiteNa(AlSi3O8)
AlⓘAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
AlⓘAnorthiteCa(Al2Si2O8)
AlⓘAlmandineFe32+Al2(SiO4)3
AlⓘCorundumAl2O3
AlⓘKyaniteAl2(SiO4)O
AlⓘLaumontiteCaAl2Si4O12 · 4H2O
AlⓘMargariteCaAl2(Al2Si2O10)(OH)2
AlⓘOmphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
AlⓘPhlogopiteKMg3(AlSi3O10)(OH)2
AlⓘPyropeMg3Al2(SiO4)3
AlⓘSapphirineMg4(Mg3Al9)O4[Si3Al9O36]
AlⓘSpinelMgAl2O4
AlⓘZoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
SiSilicon
SiⓘAlbiteNa(AlSi3O8)
SiⓘAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SiⓘAnorthiteCa(Al2Si2O8)
SiⓘAnthophyllite◻{Mg2}{Mg5}(Si8O22)(OH)2
SiⓘAlmandineFe32+Al2(SiO4)3
SiⓘDiopsideCaMgSi2O6
SiⓘEnstatiteMg2Si2O6
SiⓘForsteriteMg2SiO4
SiⓘKyaniteAl2(SiO4)O
SiⓘLaumontiteCaAl2Si4O12 · 4H2O
SiⓘMargariteCaAl2(Al2Si2O10)(OH)2
SiⓘOmphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
SiⓘPhlogopiteKMg3(AlSi3O10)(OH)2
SiⓘPyropeMg3Al2(SiO4)3
SiⓘQuartzSiO2
SiⓘSapphirineMg4(Mg3Al9)O4[Si3Al9O36]
SiⓘZirconZr(SiO4)
SiⓘZoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
SiⓘGarnet GroupX3Z2(SiO4)3
SiⓘSerpentine SubgroupD3[Si2O5](OH)4
PPhosphorus
PⓘApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
SⓘPentlandite(NixFey)Σ9S8
SⓘPyrrhotiteFe1-xS
ClChlorine
ClⓘAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ClⓘApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
KⓘPhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
CaⓘAnorthiteCa(Al2Si2O8)
CaⓘDiopsideCaMgSi2O6
CaⓘDolomiteCaMg(CO3)2
CaⓘLaumontiteCaAl2Si4O12 · 4H2O
CaⓘMargariteCaAl2(Al2Si2O10)(OH)2
CaⓘOmphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
CaⓘZoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
CaⓘApatiteCa5(PO4)3(Cl/F/OH)
TiTitanium
TiⓘAmphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
TiⓘIlmeniteFe2+TiO3
TiⓘRutileTiO2
FeIron
FeⓘAlmandineFe32+Al2(SiO4)3
FeⓘIlmeniteFe2+TiO3
FeⓘOmphacite(NaaCabFec2+Mgd)(AleFef3+Feg2+Mgh)Si2O6
FeⓘPentlandite(NixFey)Σ9S8
FeⓘPyrrhotiteFe1-xS
NiNickel
NiⓘPentlandite(NixFey)Σ9S8
ZrZirconium
ZrⓘZirconZr(SiO4)

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate
  • AlpsAccretionary Complex
EuropeContinent
Italy

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References

Bertolini, A. (1994) Alto Lario occidentale, Gravedona (CO). Rivista Mineralogica Italiana, 17, 1 (1-1994), 73-76.
Tumiati, Simone, Zanchetta, Stefano, Pellegrino, Luca, Ferrario, Claudia, Casartelli, Stefano, Malaspina, Nadia (2018) Granulite-facies Overprint in Garnet Peridotites and Kyanite Eclogites of Monte Duria (Central Alps, Italy): Clues from Srilankite- and Sapphirine-Bearing Symplectites.Journal of Petrology, 59 (1) 115-151doi:10.1093/petrology/egy021
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