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Farmington, Hartford Co., Connecticut, USAi
Regional Level Types
Farmington- not defined -
Hartford Co.County
ConnecticutState
USACountry

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Latitude & Longitude (WGS84): 41° 43' 35'' North , 72° 49' 29'' West
Latitude & Longitude (decimal): 41.72639,-72.82472
GeoHash:G#: drkjqu49u
Köppen climate type:Dfa : Hot-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Farmington25,000 (2017)0.9km
Plainville17,328 (2017)6.4km
West Hartford63,268 (2017)7.9km
New Britain72,808 (2017)8.2km
Newington30,562 (2017)9.0km


A town settled by Europeans in 1645. It originally included Avon (until 1830) and Plainville (until 1869), so using Robinson (1825) as a reference is ambiguous. Descriptions in it of prehnite and calcite, for example, clearly refer to the well-known Talcott Mountain locality now in Avon. Coordinates are for the intersection of state Routes 4 and 10.

Most references to trap rock minerals that are not locality specific (such as Schairer (1931), Januzzi (1976), Tschernich (1992)) are typically referring to the old and largely forgotten Farmington Trap Rock Quarry on state Route 4, which became the town dump and has long been covered.

Geologically, Farmington lies in the Early Mesozoic Hartford Mesozoic Basin, part of the Newark Supergroup of rift basins. The western, lowland part of town is underlain by the Triassic New Haven Arkose, while the eastern, upland portion of town is underlain by the ridge forming Jurassic Talcott and Holyoke Basalts (trap rock), with the intervening sediments of the Shuttle Meadow and East Berlin Formations. The very northwest corner of town, between the Farmington River and state Route 177, is underlain by metamorphic bedrock of the Collinsville dome - mostly Ordovician Collinsville Formation hornblende gneiss and amphibolite with a core of light gray Ordovician Bristol Gneiss.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

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

16 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Anhydrite
Formula: CaSO4
Aragonite
Formula: CaCO3
'Axinite Group' ?
Baryte
Formula: BaSO4
Calcite
Formula: CaCO3
Celestine
Formula: SrSO4
'Chabazite'
Chalcopyrite
Formula: CuFeS2
'Chlorite Group'
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Datolite
Formula: CaB(SiO4)(OH)
Gypsum
Formula: CaSO4 · 2H2O
Hematite
Formula: Fe2O3
Lechatelierite
Formula: SiO2
Malachite
Formula: Cu2(CO3)(OH)2
Pectolite
Formula: NaCa2Si3O8(OH)
Prehnite
Formula: Ca2Al2Si3O10(OH)2
'Pumpellyite'
Quartz
Formula: SiO2
Quartz var: Amethyst
Formula: SiO2
Quartz var: Chalcedony
Formula: SiO2
Sphalerite
Formula: ZnS
'Stilbite subgroup'

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Lechatelierite4.DA.30SiO2
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Aragonite5.AB.15CaCO3
Calcite5.AB.05CaCO3
Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anhydrite7.AD.30CaSO4
Baryte7.AD.35BaSO4
Celestine7.AD.35SrSO4
Gypsum7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Datolite9.AJ.20CaB(SiO4)(OH)
Pectolite9.DG.05NaCa2Si3O8(OH)
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Unclassified Minerals, Rocks, etc.
'Axinite Group' ?-
'Chabazite'-
'Chlorite Group'-
'Pumpellyite'-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anhydrite28.3.2.1CaSO4
Baryte28.3.1.1BaSO4
Celestine28.3.1.2SrSO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Datolite54.2.1a.1CaB(SiO4)(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=3
Pectolite65.2.1.4aNaCa2Si3O8(OH)
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Prehnite72.1.3.1Ca2Al2Si3O10(OH)2
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Aragonite-CaCO3
'Axinite Group' ?-
'Chabazite'-
'Chlorite Group'-
Lechatelierite-SiO2
'Pumpellyite'-
Quartz
var: Amethyst
-SiO2
var: Chalcedony-SiO2
'Stilbite subgroup'-

List of minerals for each chemical element

HHydrogen
H PrehniteCa2Al2Si3O10(OH)2
H DatoliteCaB(SiO4)(OH)
H PectoliteNaCa2Si3O8(OH)
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H MalachiteCu2(CO3)(OH)2
H GypsumCaSO4 · 2H2O
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
C AragoniteCaCO3
C MalachiteCu2(CO3)(OH)2
OOxygen
O PrehniteCa2Al2Si3O10(OH)2
O CalciteCaCO3
O DatoliteCaB(SiO4)(OH)
O AragoniteCaCO3
O BaryteBaSO4
O Quartz (var: Amethyst)SiO2
O Quartz (var: Chalcedony)SiO2
O HematiteFe2O3
O QuartzSiO2
O PectoliteNaCa2Si3O8(OH)
O LechatelieriteSiO2
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O AnhydriteCaSO4
O MalachiteCu2(CO3)(OH)2
O GypsumCaSO4 · 2H2O
O CelestineSrSO4
NaSodium
Na PectoliteNaCa2Si3O8(OH)
AlAluminium
Al PrehniteCa2Al2Si3O10(OH)2
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SiSilicon
Si PrehniteCa2Al2Si3O10(OH)2
Si DatoliteCaB(SiO4)(OH)
Si Quartz (var: Amethyst)SiO2
Si Quartz (var: Chalcedony)SiO2
Si QuartzSiO2
Si PectoliteNaCa2Si3O8(OH)
Si LechatelieriteSiO2
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SSulfur
S BaryteBaSO4
S ChalcopyriteCuFeS2
S SphaleriteZnS
S AnhydriteCaSO4
S GypsumCaSO4 · 2H2O
S CelestineSrSO4
CaCalcium
Ca PrehniteCa2Al2Si3O10(OH)2
Ca CalciteCaCO3
Ca DatoliteCaB(SiO4)(OH)
Ca AragoniteCaCO3
Ca PectoliteNaCa2Si3O8(OH)
Ca AnhydriteCaSO4
Ca GypsumCaSO4 · 2H2O
FeIron
Fe ChalcopyriteCuFeS2
Fe HematiteFe2O3
CuCopper
Cu ChalcopyriteCuFeS2
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu MalachiteCu2(CO3)(OH)2
ZnZinc
Zn SphaleriteZnS
SrStrontium
Sr CelestineSrSO4
BaBarium
Ba BaryteBaSO4

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 Macrostrat.org

Early Jurassic - Late Triassic
174.1 - 237 Ma



ID: 2791643
New Haven Arkose

Age: Mesozoic (174.1 - 237 Ma)

Stratigraphic Name: New Haven Arkose

Description: Red, pink, and gray coarse-grained, locally conglomeratic, poorly sorted and indurated arkose, interbedded with brick-red micaceous, locally shaly siltstone and fine-grained feldspathic clayey sandstone.

Comments: Part of Central Lowlands; Newark Terrane - Hartford and Pomperaug Mesozoic Basins; part of Newark Supergroup (Upper Triassic and Lower Jurassic). 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:{arkose}, Minor:{conglomerate,siltstone,sandstone}

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]

Triassic
201.3 - 251.902 Ma



ID: 3188891
Mesozoic volcanic and intrusive rocks

Age: Triassic (201.3 - 251.902 Ma)

Comments: Connecticut Valley Basin

Lithology: Mafic volcanic rocks; conglomerate,arkose,shale,arenite

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Robinson, Samuel. (1825), A Catalogue of American Minerals, with their localities. Boston.
Longwell & Dana (1932), Walks & Rides in Central Connecticut & Massachusetts: 229.
White, John, and Cook, Robert. (1990), Amethyst Occurrences of the Eastern United States. Mineralogical Record: 21(3): 203-213.
Lunar and Planetary Science XXXIV (2003).

Localities in this Region
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