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Laghetto pegmatitic dyke (Laghetto Quarry), Piona Peninsula, Colico, Lecco Province, Lombardy, Italyi
Regional Level Types
Laghetto pegmatitic dyke (Laghetto Quarry)Dike
Piona PeninsulaPeninsula
ColicoCommune
Lecco ProvinceProvince
LombardyRegion
ItalyCountry

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Key
Latitude & Longitude (WGS84):
46° 7' 5'' North , 9° 19' 34'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Olgiasca241 (2014)0.9km
Dorio323 (2017)2.1km
Sueglio167 (2014)3.6km
Dongo3,489 (2014)3.7km
Gravedona-San Gregorio3,697 (2014)3.7km
Name(s) in local language(s):
Filone pegmatitico del Laghetto (Cava del Laghetto), Penisola di Piona, Colico, Provincia di Lecco, Lombardia, Italia


Abandoned feldspar quarry, which was actively exploited in the early years of the 1900s and definitely ceased in 1952, opened in a sub-vertical pegmatite dyke located on the eastern side of Piona Peninsula.

Cartography: IGM F. 17 II S.O.

Altitude: 219 metres a.s.l.

The entrance to the underground works is blocked by a landslide and the main gallery is flooded. Minerals are found in the quarry dumps.

This locality is famous for the large crysoberyl crystals (often twinned), which occur with minerals of the primary paragenetic association (almandine, schorl, zircon, uraninite, and rare beryl). An interesting secondary hydrothermal association, consisting of phenakite, bertrandite, secondary beryl, and fluorapatite, has been recently described (Vignola et al., 2015).

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


18 valid minerals. 1 erroneous literature entry.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Olgiasca-Malpensata (Piona), Colico, Como Province, Lombardy, Italy
Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: AA. VV., 1996. Collezionare minerali. Hobby & Work.; Vignola P., Gentile P., Rotiroti N. (2015): Fenacite e bertrandite della cava del Laghetto, Colico (LC). Riv. Mineral. Ital., 39, 2, 116-121.
Autunite
Formula: Ca(UO2)2(PO4)2 · 11H2O
Reference: Olgiasca-Malpensata (Piona), Colico, Como Province, Lombardy, Italy
Bertrandite
Formula: Be4(Si2O7)(OH)2
Reference: Vignola P., Gentile P., Rotiroti N. (2015): Fenacite e bertrandite della cava del Laghetto, Colico (LC). Riv. Mineral. Ital., 39, 2, 116-121.
Beryl
Formula: Be3Al2(Si6O18)
Reference: Vignola P., Gentile P., Rotiroti N. (2015): Fenacite e bertrandite della cava del Laghetto, Colico (LC). Riv. Mineral. Ital., 39, 2, 116-121.
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: - Del Caldo, A., Moro, C., Gramaccioli, C.M., Boscardin, M. (1973): Guida ai Minerali. Fratelli Fabbri, Ed., Milano, 208 pp.
Chrysoberyl
Formula: BeAl2O4
Reference: AA. VV., 1996. Collezionare minerali. Hobby & Work.
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Grammatica Pier Luigi; Vignola P., Gentile P., Rotiroti N. (2015): Fenacite e bertrandite della cava del Laghetto, Colico (LC). Riv. Mineral. Ital., 39, 2, 116-121.
Metatorbernite
Formula: Cu(UO2)2(PO4)2 · 8H2O
Reference: Olgiasca-Malpensata (Piona), Colico, Como Province, Lombardy, Italy
Microcline
Formula: K(AlSi3O8)
Reference: Olgiasca-Malpensata (Piona), Colico, Como Province, Lombardy, Italy
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Olgiasca-Malpensata (Piona), Colico, Como Province, Lombardy, Italy
Orthoclase
Formula: K(AlSi3O8)
Description: = microcline
Reference: Olgiasca-Malpensata (Piona), Colico, Como Province, Lombardy, Italy
Phenakite
Formula: Be2SiO4
Reference: Vignola P., Gentile P., Rotiroti N. (2015): Fenacite e bertrandite della cava del Laghetto, Colico (LC). Riv. Mineral. Ital., 39, 2, 116-121.
Pyrite
Formula: FeS2
Reference: - Del Caldo, A., Moro, C., Gramaccioli, C.M., Boscardin, M. (1973): Guida ai Minerali. Fratelli Fabbri, Ed., Milano, 208 pp.
Pyrrhotite
Formula: Fe7S8
Reference: Olgiasca-Malpensata (Piona), Colico, Como Province, Lombardy, Italy
Quartz
Formula: SiO2
Reference: Olgiasca-Malpensata (Piona), Colico, Como Province, Lombardy, Italy
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: - Del Caldo, A., Moro, C., Gramaccioli, C.M., Boscardin, M. (1973): Guida ai Minerali. Fratelli Fabbri, Ed., Milano, 208 pp.
Torbernite
Formula: Cu(UO2)2(PO4)2 · 12H2O
Reference: Olgiasca-Malpensata (Piona), Colico, Como Province, Lombardy, Italy
Uraninite
Formula: UO2
Reference: Olgiasca-Malpensata (Piona), Colico, Como Province, Lombardy, Italy; Vignola P., Gentile P., Rotiroti N. (2015): Fenacite e bertrandite della cava del Laghetto, Colico (LC). Riv. Mineral. Ital., 39, 2, 116-121.
Zircon
Formula: Zr(SiO4)
Reference: AA. VV., 1996. Collezionare minerali. Hobby & Work. ; Vignola P., Gentile P., Rotiroti N. (2015): Fenacite e bertrandite della cava del Laghetto, Colico (LC). Riv. Mineral. Ital., 39, 2, 116-121.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
Chrysoberyl4.BA.05BeAl2O4
Quartz4.DA.05SiO2
Uraninite4.DL.05UO2
Group 8 - Phosphates, Arsenates and Vanadates
Autunite8.EB.05Ca(UO2)2(PO4)2 · 11H2O
Fluorapatite8.BN.05Ca5(PO4)3F
Metatorbernite8.EB.10Cu(UO2)2(PO4)2 · 8H2O
Torbernite8.EB.05Cu(UO2)2(PO4)2 · 12H2O
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Almandine9.AD.25Fe2+3Al2(SiO4)3
Bertrandite9.BD.05Be4(Si2O7)(OH)2
Beryl9.CJ.05Be3Al2(Si6O18)
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Orthoclase ?9.FA.30K(AlSi3O8)
Phenakite9.AA.05Be2SiO4
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 7 - MULTIPLE OXIDES
AB2X4
Chrysoberyl7.2.9.1BeAl2O4
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
AB2(XO4)2·xH2O, containing (UO2)2+
Autunite40.2a.1.1Ca(UO2)2(PO4)2 · 11H2O
Metatorbernite40.2a.13.2Cu(UO2)2(PO4)2 · 8H2O
Torbernite40.2a.13.1Cu(UO2)2(PO4)2 · 12H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [4] coordination
Phenakite51.1.1.1Be2SiO4
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with cations in [4] coordination
Bertrandite56.1.1.1Be4(Si2O7)(OH)2
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
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Orthoclase ?76.1.1.1K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2

List of minerals for each chemical element

HHydrogen
H TorberniteCu(UO2)2(PO4)2 · 12H2O
H MetatorberniteCu(UO2)2(PO4)2 · 8H2O
H AutuniteCa(UO2)2(PO4)2 · 11H2O
H MuscoviteKAl2(AlSi3O10)(OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H BertranditeBe4(Si2O7)(OH)2
BeBeryllium
Be ChrysoberylBeAl2O4
Be PhenakiteBe2SiO4
Be BertranditeBe4(Si2O7)(OH)2
Be BerylBe3Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O UraniniteUO2
O TorberniteCu(UO2)2(PO4)2 · 12H2O
O MetatorberniteCu(UO2)2(PO4)2 · 8H2O
O AutuniteCa(UO2)2(PO4)2 · 11H2O
O ZirconZr(SiO4)
O AlbiteNa(AlSi3O8)
O MuscoviteKAl2(AlSi3O10)(OH)2
O QuartzSiO2
O ChrysoberylBeAl2O4
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O AlmandineFe32+Al2(SiO4)3
O FluorapatiteCa5(PO4)3F
O MicroclineK(AlSi3O8)
O PhenakiteBe2SiO4
O BertranditeBe4(Si2O7)(OH)2
O BerylBe3Al2(Si6O18)
O OrthoclaseK(AlSi3O8)
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
F FluorapatiteCa5(PO4)3F
NaSodium
Na AlbiteNa(AlSi3O8)
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
AlAluminium
Al AlbiteNa(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al ChrysoberylBeAl2O4
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al AlmandineFe32+Al2(SiO4)3
Al MicroclineK(AlSi3O8)
Al BerylBe3Al2(Si6O18)
Al OrthoclaseK(AlSi3O8)
SiSilicon
Si ZirconZr(SiO4)
Si AlbiteNa(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si AlmandineFe32+Al2(SiO4)3
Si MicroclineK(AlSi3O8)
Si PhenakiteBe2SiO4
Si BertranditeBe4(Si2O7)(OH)2
Si BerylBe3Al2(Si6O18)
Si OrthoclaseK(AlSi3O8)
PPhosphorus
P TorberniteCu(UO2)2(PO4)2 · 12H2O
P MetatorberniteCu(UO2)2(PO4)2 · 8H2O
P AutuniteCa(UO2)2(PO4)2 · 11H2O
P FluorapatiteCa5(PO4)3F
SSulfur
S PyrrhotiteFe7S8
S PyriteFeS2
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
K MicroclineK(AlSi3O8)
K OrthoclaseK(AlSi3O8)
CaCalcium
Ca AutuniteCa(UO2)2(PO4)2 · 11H2O
Ca FluorapatiteCa5(PO4)3F
FeIron
Fe PyrrhotiteFe7S8
Fe PyriteFeS2
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe AlmandineFe32+Al2(SiO4)3
CuCopper
Cu TorberniteCu(UO2)2(PO4)2 · 12H2O
Cu MetatorberniteCu(UO2)2(PO4)2 · 8H2O
ZrZirconium
Zr ZirconZr(SiO4)
UUranium
U UraniniteUO2
U TorberniteCu(UO2)2(PO4)2 · 12H2O
U MetatorberniteCu(UO2)2(PO4)2 · 8H2O
U AutuniteCa(UO2)2(PO4)2 · 11H2O

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Repossi E. (1904): Appunti mineralogici sulla Pegmatite di Olgiasca (Lago di Como). Atti R. Acc. Naz. Lincei, Rend. classe sc. fis. mat. nat., serie 5, 13, 86-90.
Repossi E. (1907): Il crisoberillo nella pegmatite di Olgiasca (Lago di Como). Atti Congresso Naturalisti Italiani, Milano 1906, 246-248.
Repossi E. (1913): I filoni pegmatitici di Olgiasca. Rinvenimento in essi di minerali di uranio. Atti Soc. Ital. Sc. Nat., 52, 4, 487-513.
Colasso T. (1937): I minerali dei filoni pegmatitici di Olgiasca. Atti Soc. Ital. Sc. Nat., 76, 4, 403-418.
Magistretti L. (1940): Berillo nel filone pegmatitico del laghetto di Piona. Natura, 31, 2, 70-72.
Scaini G. (1972): Filone del Laghetto. In: Boscardin M., de Michele V., Scaini G. (eds.), Itinerari mineralogici della Lombardia. Museo Civico di Storia Naturale e Società Italiana di Scienze Naturali, Milano, 47-50.
Del Caldo A., Moro C., Gramaccioli C.M., Boscardin M. (1973): Guida ai Minerali. Fratelli Fabbri Ed., Milano, 208 pp.
De Michele V. (1974): Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol., 408 pp.
Gramaccioli C.M. (1975): Minerali alpini e prealpini. Istituto Italiano Edizioni Atlas, Bergamo, 2 vol., 472 pp.
Rivista Mineraogica Italiana, anni :
1975 n. 3 pg. 60 - 1976 n. 3 pg 55 - 1979 n. 3 pg. 76 - 1983 n. 1 pg. 29
1984 n. 3 pg. 94 - 1985 n. 2 pg. 86 e 87 - 1987 n. 1 pg. 64 -
1991 n. 1 pg. 63 - 1993 n. 4 pg. 211
Taravella G. (1994): Le pegmatiti in Lombardia. Ed. privata, Milano, pages 20-23.
Vignola P., Gentile P., Rotiroti N. (2015): Fenacite e bertrandite della cava del Laghetto, Colico (LC). Riv. Mineral. Ital., 39, 2, 116-121.

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