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Darengo Valley, Como Province, Lombardy, Italyi
Regional Level Types
Darengo ValleyValley
Como ProvinceProvince
LombardyRegion
ItalyCountry

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Key
Locality type:
Name(s) in local language(s):
Val Darengo


Darengo Valley is a small lateral one in the west side of northern Lario (Como lake, north Italy), near Gravedona town.
It is the top of Borgo riverbed, small river giving its name to the abandoned village in the middle of the valley.

At Dangri village (697m) an old stone bridge allows to enter the pathway to Capanna Como refuge, the upper point of Darengo Valley.
It is a very wild place: the lower part, from Dangry bridge since Borgo one, is too difficult to explore, because of no existing footpath, deep running water and high risk of falling stones from the gorge sides, very close and unstable.
At 1070m, after two hours on foot, we reach Borgo abandoned village.
The old bridge was reconstructed after the main 1983 flood.
Here the valley floor widens and the mineral research can starting in the Livo riverbed.

Many morphological elements remind of the last glacial maximum age, such as sand and "shoes stones" on moraine deposits.
More structural clues are many landslides, such as the great one of Sasso Marcio near Borgo village.

It is a very wild place and the simlest way to find minerals is looking for them on the riverbed, where great stones fall from the valley sides.

A typical research point is Pizzo Ledù, with a lot of pegmatitic rocks on its slope.

Pegmatites are part of the so-called Bodengo pegmatite area, a large region including the upper portions of a series of valleys (Leggia and Cama valleys, Moesa, Graubünden, Switzerland; Bodengo, Soè and Garzelli valleys, Sondrio Province, Lombardy, Italy; Dosso and Darengo valleys, Como Province, Lombardy, Italy) located between the Mesolcina (west) and Mera (east) valleys, Southern Steep Belt of the Central Alps.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


7 valid minerals.

Detailed Mineral List:

Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: Giorgio Taravella - LE PEGMATITI AFFIORANTI IN LOMBARDIA - 198X Antonio Bertolini - ALTO LARIO OCCIDENTALE, GRAVEDONA (CO) - rivista mineralogica italiana, vol.1, 1994
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Description: Sample found near Raggio bridge, analized by AMI UK service. Diffrattometric SC-XRD iunvestigation, P a = 9.3750(5) b = 6.8863(6)
Reference: - Giorgio Taravella (198x): LE PEGMATITI AFFIORANTI IN LOMBARDIA. 54-62 pp.
Beryl
Formula: Be3Al2(Si6O18)
Reference: Giorgio Taravella - LE PEGMATITI AFFIORANTI IN LOMBARDIA - 198X Antonio Bertolini - ALTO LARIO OCCIDENTALE, GRAVEDONA (CO) - rivista mineralogica italiana, vol.1, 1994
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: Giorgio Taravella - LE PEGMATITI AFFIORANTI IN LOMBARDIA - 198X Antonio Bertolini - ALTO LARIO OCCIDENTALE, GRAVEDONA (CO) - rivista mineralogica italiana, vol.1, 1994
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Giorgio Taravella - LE PEGMATITI AFFIORANTI IN LOMBARDIA - 198X Antonio Bertolini - ALTO LARIO OCCIDENTALE, GRAVEDONA (CO) - rivista mineralogica italiana, vol.1, 1994
Pyrope
Formula: Mg3Al2(SiO4)3
Reference: Antonio Bertolini - ALTO LARIO OCCIDENTALE, GRAVEDONA (CO) - rivista mineralogica italiana, vol.1, 1994, pg. 73-76]
Quartz
Formula: SiO2
Reference: Giorgio Taravella - LE PEGMATITI AFFIORANTI IN LOMBARDIA - 198X Antonio Bertolini - ALTO LARIO OCCIDENTALE, GRAVEDONA (CO) - rivista mineralogica italiana, vol.1, 1994
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Giorgio Taravella - LE PEGMATITI AFFIORANTI IN LOMBARDIA - 198X Antonio Bertolini - ALTO LARIO OCCIDENTALE, GRAVEDONA (CO) - rivista mineralogica italiana, vol.1, 1994
Zircon
Formula: Zr(SiO4)
Reference: Capponi Fulvio collection

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 9 - Silicates
Almandine9.AD.25Fe2+3Al2(SiO4)3
Beryl9.CJ.05Be3Al2(Si6O18)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Pyrope9.AD.25Mg3Al2(SiO4)3
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2

List of minerals arranged by Dana 8th Edition classification

Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Pyrope51.4.3a.1Mg3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2

List of minerals for each chemical element

HHydrogen
H MuscoviteKAl2(AlSi3O10)(OH)2
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H ApatiteCa5(PO4)3(Cl/F/OH)
BeBeryllium
Be BerylBe3Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O BerylBe3Al2(Si6O18)
O AlmandineFe32+Al2(SiO4)3
O MuscoviteKAl2(AlSi3O10)(OH)2
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O QuartzSiO2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O PyropeMg3Al2(SiO4)3
O ZirconZr(SiO4)
O ApatiteCa5(PO4)3(Cl/F/OH)
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
F ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Mg PyropeMg3Al2(SiO4)3
AlAluminium
Al BerylBe3Al2(Si6O18)
Al AlmandineFe32+Al2(SiO4)3
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al PyropeMg3Al2(SiO4)3
SiSilicon
Si BerylBe3Al2(Si6O18)
Si AlmandineFe32+Al2(SiO4)3
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si QuartzSiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si PyropeMg3Al2(SiO4)3
Si ZirconZr(SiO4)
PPhosphorus
P ApatiteCa5(PO4)3(Cl/F/OH)
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
CaCalcium
Ca ApatiteCa5(PO4)3(Cl/F/OH)
FeIron
Fe AlmandineFe32+Al2(SiO4)3
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
ZrZirconium
Zr ZirconZr(SiO4)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
- Giorgio Taravella (198x): LE PEGMATITI AFFIORANTI IN LOMBARDIA. 54-62 pp.
- Antonio Bertolini (1994): ALTO LARIO OCCIDENTALE, GRAVEDONA (CO). Rivista Mineralogica Italiana, vol. 1, 73-76.


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