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Wilton, Fairfield Co., Connecticut, USAi
Regional Level Types
Wilton- not defined -
Fairfield Co.County

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Latitude & Longitude (WGS84): 41° 11' 43'' North , 73° 26' 18'' West
Latitude & Longitude (decimal): 41.19528,-73.43833
GeoHash:G#: dr7f2g7gf
Köppen climate type:Cfa : Humid subtropical climate

A town incorporated in 1802, before that it was a parish first recognized in 1726 and was part of Norwalk. Coordinates are for Ridgefield Road near the town center

Geologically, Wilton lies within the Connecticut Valley Terrane of metamorphic rocks. The north central part of town is underlain by members of the Ordovician Harrison Gneiss metadiorite. A small body of ultramafic rock crops out at the southern end of these metaplutons, just north of the town center. A belt of Ordovician Rowe Schist lies to the east of the Harrison Gneiss (along northern US Route 7 and under Honey Hill), Both these rock units are surrounded by Ordovician unnamed felsic orthogneiss, which at the southern end of town is mixed with the Ordovician Trap Falls Formation.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

Mineral List

Mineral list contains entries from the region specified including sub-localities

12 valid minerals.

Detailed Mineral List:

Formula: Na(AlSi3O8)
Formula: Fe2+3Al2(SiO4)3
Formula: FeAsS
Reference: The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 98.
Reference: The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 98.
Formula: CuFeS2
Formula: PbS
Reference: The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 98.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 98.
Formula: K(AlSi3O8)
Formula: KAl2(AlSi3O10)(OH)2
Formula: FeS2
Formula: SiO2
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Formula: Ag
Formula: ZnS
Formula: Mg3Si4O10(OH)2
Reference: The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 98.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides
Group 9 - Silicates
Unclassified Minerals, Rocks, etc.
'Garnet Group'-X3Z2(SiO4)3

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
AmBnXp, with (m+n):p = 1:1
AmBnXp, with (m+n):p = 1:2
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Unclassified Minerals, Rocks, etc.
'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

H MuscoviteKAl2(AlSi3O10)(OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H TalcMg3Si4O10(OH)2
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O AlbiteNa(AlSi3O8)
O AlmandineFe32+Al2(SiO4)3
O Garnet GroupX3Z2(SiO4)3
O MicroclineK(AlSi3O8)
O MuscoviteKAl2(AlSi3O10)(OH)2
O QuartzSiO2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O TalcMg3Si4O10(OH)2
Na AlbiteNa(AlSi3O8)
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Mg TalcMg3Si4O10(OH)2
Al AlbiteNa(AlSi3O8)
Al AlmandineFe32+Al2(SiO4)3
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si AlbiteNa(AlSi3O8)
Si AlmandineFe32+Al2(SiO4)3
Si Garnet GroupX3Z2(SiO4)3
Si MicroclineK(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si TalcMg3Si4O10(OH)2
S ArsenopyriteFeAsS
S ChalcopyriteCuFeS2
S GalenaPbS
S PyriteFeS2
S SphaleriteZnS
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
Fe AlmandineFe32+Al2(SiO4)3
Fe ArsenopyriteFeAsS
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Cu ChalcopyriteCuFeS2
Zn SphaleriteZnS
As ArsenopyriteFeAsS
Pb GalenaPbS

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Eifelian - Lochkovian
387.7 - 419.2 Ma

ID: 2896343
Ordovician? granitic gneiss

Age: Devonian (387.7 - 419.2 Ma)

Description: (Including local terms Ansonia, Mine Hill, "Tyler Lake," "Siscowit") - White, light-gray, buff, or pink, generally foliated granitic gneiss, composed of sodic plagioclase, quartz, microcline, muscovite, and biotite, and locally garnet or sillimanite. Commonly contains numerous inclusions or layers of mica schist and gneiss.

Comments: Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Ansonia Gneiss is here referred to as Ansonia leucogranite. On the basis of field and laboratory studies, Ansonia, Beardsley, Pumpkin Ground, and Shelton gneisses, previously considered stratigraphic units, are reinterpreted as plutonic. Ansonia is described as a strongly lineated and moderately foliated, fine-grained, garnet-bearing, biotite-muscovite leucogranite with a well-developed granoblastic texture. Intrudes Beardsley and Pumpkin Ground orthogneisses. Maximum age from zircons is 417+/-1.5 Ma. Conservative interpretation of isotopic data is crystallization between 393 and 419 Ma and therefore, authors assign an age of 406+/-13 Ma (Late Silurian to Early Devonian) to the Ansonia (Sevigny and Hanson, 1993) per CT007. Original map source: Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2000, Bedrock Geology of Connecticut, shapefile, scale 1:50,000

Lithology: Major:{gneiss}, Minor:{mica schist}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Ordovician - Neoproterozoic
443.8 - 1000 Ma

ID: 3190671
Precambrian-Phanerozoic sedimentary rocks

Age: Neoproterozoic to Ordovician (443.8 - 1000 Ma)

Lithology: Mudstone-carbonate-sandstone-conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License


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Manchester, J.G. (1931): The Minerals of New York City & Its Environs, New York Mineralogical Club Bulletin: 3(1): 98.

Localities in this Region
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This page contains all mineral locality references listed on 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 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.
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