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State Route 4 road cut, Farmington, Hartford County, Connecticut, USAi
Regional Level Types
State Route 4 road cutRoad Cutting
FarmingtonTown
Hartford CountyCounty
ConnecticutState
USACountry

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Latitude & Longitude (WGS84):
41° 43' 26'' North , 72° 48' 41'' West
Latitude & Longitude (decimal):
41.72389,-72.81139
GeoHash:
G#: drkjr5s77
GRN:
N28W40
Type:
Road Cutting
KΓΆppen climate type:
Dfa : Hot-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Farmington25,000 (2017)1.8km
Plainville17,328 (2017)6.7km
West Hartford63,268 (2017)7.1km
New Britain72,808 (2017)7.5km
Newington30,562 (2017)7.8km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Bristol Gem & Mineral ClubBristol, Connecticut13km
Lapidary and Mineral Society of Central ConnecticutMeriden, Connecticut21km
Connecticut Valley Mineral ClubSpringfield, Massachusetts46km
New Haven Mineral ClubNew Haven, Connecticut47km
Mindat Locality ID:
205501
Long-form identifier:
mindat:1:2:205501:8
GUID (UUID V4):
1e302caa-b90a-42c7-9543-82b7b7234343


Road cut on north side of state Route 4 exposing both the early Jurassic Talcott Basalt and underlying Triassic New Haven Arkose. Minerals occur mostly in the interstitial spaces between lava pillows in the Talcott; green secondary copper mineralization is visible in the arkose, with malachite formed along the bedding planes. The basalt exposed in the "jug handle" part of the interchange and the small commuter parking lot east of the cut is the Jurassic Holyoke Basalt, which is not mineralized here. A fault separates the two basalt flows here, with the normally intervening Jurassic Shuttle Meadow formation missing.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


11 valid minerals.

Detailed Mineral List:

β“˜ 'Axinite Group' ?
Description: ??? Must be a mistake in the reference as this mineral is not known from any basalt exposure in the region.
β“˜ Calcite
Formula: CaCO3
β“˜ Celestine
Formula: SrSO4
Habit: blocky subhedral
Colour: pale blue
Description: crystals partly filling a void in a quartz crystal lining
β“˜ Chalcopyrite
Formula: CuFeS2
β“˜ Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Habit: massive encrustations
Colour: blue-green
Description: secondary crusts on fractures, bedding planes and between sand grains in the arkose below the lava.
βœͺ Datolite
Formula: CaB(SiO4)(OH)
Habit: stubby complex prisms
Colour: white to pale green
Description: Crystal can be gemmy and up to 2-3 cm.
β“˜ Ferrosaponite ?
Formula: Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
Habit: platy globules
Colour: dark greenish black
Description: As platy globules 1-2 mm on datolite.
β“˜ Gypsum
Formula: CaSO4 · 2H2O
Habit: tabular, crusts
Colour: white
Description: thin encrusting crystals with malachite on bedding planes in the arkose below the lava.
β“˜ Hematite
Formula: Fe2O3
Habit: encrustations
Colour: reddish brown
Description: reddish coatings on fractures in the lava.
β“˜ 'K Feldspar'
β“˜ 'K Feldspar var. Adularia'
Formula: KAlSi3O8
Colour: off white
Description: As a thin crust on prehnite botryoids with datolite.
β“˜ Malachite
Formula: Cu2(CO3)(OH)2
Habit: thin films to acicular
Colour: green
Description: As thin green films and stains with white gypsum in the uppermost New Haven Arkose just below the lava flow.
β“˜ Prehnite
Formula: Ca2Al2Si3O10(OH)2
β“˜ 'Pumpellyite Subgroup'
Formula: Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
β“˜ Quartz
Formula: SiO2
Habit: short prismatic druse
Colour: colorless to amethystine
Description: Parallel growth crystals lining a void between lava pillows enclosing celestine

Gallery:

SrSO4β“˜ Celestine
CaB(SiO4)(OH)β“˜ Datolite
Ca2Al2Si3O10(OH)2β“˜ Prehnite

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Chalcopyrite2.CB.10aCuFeS2
Group 4 - Oxides and Hydroxides
β“˜Hematite4.CB.05Fe2O3
β“˜Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
β“˜Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
β“˜Celestine7.AD.35SrSO4
β“˜Gypsum7.CD.40CaSO4 Β· 2H2O
Group 9 - Silicates
β“˜Datolite9.AJ.20CaB(SiO4)(OH)
β“˜Prehnite9.DP.20Ca2Al2Si3O10(OH)2
β“˜Ferrosaponite ?9.EC.45Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 Β· 4H2O
β“˜Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 Β· nH2O, x < 1
Unclassified
β“˜'K Feldspar
var. Adularia'		-KAlSi3O8
β“˜'Pumpellyite Subgroup'-Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
β“˜'K Feldspar'-
β“˜'Axinite Group' ?-

List of minerals for each chemical element

HHydrogen
Hβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Hβ“˜ DatoliteCaB(SiO4)(OH)
Hβ“˜ GypsumCaSO4 · 2H2O
Hβ“˜ MalachiteCu2(CO3)(OH)2
Hβ“˜ PrehniteCa2Al2Si3O10(OH)2
Hβ“˜ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Hβ“˜ FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
BBoron
Bβ“˜ DatoliteCaB(SiO4)(OH)
CCarbon
Cβ“˜ CalciteCaCO3
Cβ“˜ MalachiteCu2(CO3)(OH)2
OOxygen
Oβ“˜ K Feldspar var. AdulariaKAlSi3O8
Oβ“˜ CalciteCaCO3
Oβ“˜ CelestineSrSO4
Oβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Oβ“˜ DatoliteCaB(SiO4)(OH)
Oβ“˜ GypsumCaSO4 · 2H2O
Oβ“˜ HematiteFe2O3
Oβ“˜ MalachiteCu2(CO3)(OH)2
Oβ“˜ PrehniteCa2Al2Si3O10(OH)2
Oβ“˜ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Oβ“˜ QuartzSiO2
Oβ“˜ FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
MgMagnesium
Mgβ“˜ FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
AlAluminium
Alβ“˜ K Feldspar var. AdulariaKAlSi3O8
Alβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Alβ“˜ PrehniteCa2Al2Si3O10(OH)2
Alβ“˜ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Alβ“˜ FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
SiSilicon
Siβ“˜ K Feldspar var. AdulariaKAlSi3O8
Siβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Siβ“˜ DatoliteCaB(SiO4)(OH)
Siβ“˜ PrehniteCa2Al2Si3O10(OH)2
Siβ“˜ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Siβ“˜ QuartzSiO2
Siβ“˜ FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
SSulfur
Sβ“˜ CelestineSrSO4
Sβ“˜ ChalcopyriteCuFeS2
Sβ“˜ GypsumCaSO4 · 2H2O
KPotassium
Kβ“˜ K Feldspar var. AdulariaKAlSi3O8
CaCalcium
Caβ“˜ CalciteCaCO3
Caβ“˜ DatoliteCaB(SiO4)(OH)
Caβ“˜ GypsumCaSO4 · 2H2O
Caβ“˜ PrehniteCa2Al2Si3O10(OH)2
Caβ“˜ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Caβ“˜ FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
FeIron
Feβ“˜ ChalcopyriteCuFeS2
Feβ“˜ HematiteFe2O3
Feβ“˜ FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
CuCopper
Cuβ“˜ ChalcopyriteCuFeS2
Cuβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Cuβ“˜ MalachiteCu2(CO3)(OH)2
SrStrontium
Srβ“˜ CelestineSrSO4

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 398.
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