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Arute Field, New Britain, Hartford Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 41' 43'' North , 72° 45' 36'' West
Latitude & Longitude (decimal): 41.69528,-72.76000
GeoHash:G#: drkm0q3u9
Köppen climate type:Dfa : Hot-summer humid continental climate

In late 1990 to early 1991, Arute Field, home to the Connecticut Blue Devils football team at the Central Connecticut State University, was under construction. The athletic fields were being leveled into bedrock. The East Berlin formation (shale) and the Hampden Basalt were exposed along with NNE trending fault veins. Numerous other NNE faults occur in the area, which are mineralized with quartz, dolomite, baryte, copper mineral, and hydrocarbon.

Gray (1982) provides a description of the nearby, similar Columbus Street vein that is relevant to the Arute Field locality, although not all the same minerals are reported for both localities:

Basalt bordering the vein is silicified and bleached to a light gray color. This type of alteration is typical of the N45°W [actually N45°E according to Hubert et al (1992)] faults in the New Britain area irrespective of the presence of the carbonate-quartz-barite veins.

Vein filling was accomplished initially by the deposition of quartz, calcite, and ferroan dolomite in open spaces along the active fault zone. Movement continued throughout this phase frequently brecciating previously deposited vein material. After faulting ceased barite which occurs in plumose crystal groups up to 20 cm long, filled the open space in the center of the vein and cemented the carbonate-quartz breccias. The ferroan dolomite of the carbonate zone is oxidized to a dark red-brown color at the boundary of the barite zone. Cavities between barite crystals are filled by small amounts of drusy quartz, ferroan dolomite, and aragonite.

Sphalerite, chalcopyrite, galena, and minor amounts of barite, chalcocite, covellite, and tennantite fill open spaces and replace carbonates within the quartz-carbonate zones. Sphalerite was the first sulfide deposited. Galena and chalcopyrite followed later.

Vitreous black carbonaceous spheres, 1 to 5 mm in diameter, occur throughout the vein but are most abundant along the boundary of the quartz-carbonate and barite zones. Presumably these spheres were droplets of oil suspended in the hydrothermal fluids which became accidentally trapped during the deposition of the vein minerals.

Hubert et al (1992) and Scovil (2008) provide additional descriptions of similar vein sites nearby. Hubert gives an age of 180 million years ago for the mineralization.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

11 valid minerals.

Detailed Mineral List:

Formula: CaCO3
Habit: acicular
Colour: colorless to white
Description: masses of acicular crystals to a couple cm found in vugs along faults, usually with goethite surrounded by very altered earlier mineralization.
Reference: Collection of Harold Moritz
Formula: Cu3(CO3)2(OH)2
Reference: personal identification
Formula: BaSO4
Habit: tabular
Colour: white
Description: In fault veins as massive to tabular crystals, singly in small vugs or in slightly radiating aggregates reaching 15 cm or more.
Reference: Harold Moritz collection
Habit: amorphous
Colour: black
Description: amorphous, vitreous masses with conchoidal fracture
Reference: Collection of Harold Moritz
Formula: CaCO3
Reference: Collection of Harold Moritz
Formula: CuFeS2
Habit: massive
Colour: brassy, iridescent
Description: massive, typically coated with secondary copper minerals
Reference: Harold Moritz collection
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Habit: massive encrustations on chalcopyrite
Colour: pale blue
Reference: Harold Moritz collection
Formula: CaMg(CO3)2
Habit: curved rhombohedral
Colour: tan
Description: grades into browner ferroan dolomite, surfaces commonly etched
Reference: Collection of Harold Moritz
Dolomite var: Ferroan Dolomite
Formula: Ca(Mg,Fe)(CO3)2
Habit: curved rhombohedra
Colour: brown
Description: grades into tan normal dolomite, surfaces commonly etched
Reference: Gray (1982)
Formula: α-Fe3+O(OH)
Habit: massive
Colour: brown to red-brown
Description: earthy, commonly replacing sulfides and coating other minerals
Reference: Collection of Harold Moritz
Formula: (Fe,O,OH,H2O)
Reference: Van King
Formula: Cu2(CO3)(OH)2
Habit: massive
Colour: green
Description: usually coating chalcopyrite
Reference: Harold Moritz collection
Formula: SiO2
Habit: short trigonal prismatic
Colour: colorless to milky
Description: Herkimer-style crystals to 2-3 cm in voids between baryte blades, or as drusy coatings on altered basalt
Reference: Harold Moritz collection
Formula: FeCO3
Habit: rhombohedra
Colour: very dark brown
Description: usually in groups coating drusy quartz on altered basalt matrix, possibly pseudomorphed by goethite.
Reference: Collection of Harold Moritz

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates
var: Ferroan Dolomite5.AB.10Ca(Mg,Fe)(CO3)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Group 9 - Silicates
'Chrysocolla'9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Unclassified Minerals, Rocks, etc.

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
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
Unclassified Minerals, Rocks, etc.
var: Ferroan Dolomite

List of minerals for each chemical element

H AzuriteCu3(CO3)2(OH)2
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H Goethiteα-Fe3+O(OH)
H Limonite(Fe,O,OH,H2O)
H MalachiteCu2(CO3)(OH)2
C AragoniteCaCO3
C AzuriteCu3(CO3)2(OH)2
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
C MalachiteCu2(CO3)(OH)2
C SideriteFeCO3
O AragoniteCaCO3
O AzuriteCu3(CO3)2(OH)2
O BaryteBaSO4
O CalciteCaCO3
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O DolomiteCaMg(CO3)2
O Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
O Goethiteα-Fe3+O(OH)
O Limonite(Fe,O,OH,H2O)
O MalachiteCu2(CO3)(OH)2
O QuartzSiO2
O SideriteFeCO3
Mg DolomiteCaMg(CO3)2
Mg Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si QuartzSiO2
S BaryteBaSO4
S ChalcopyriteCuFeS2
Ca AragoniteCaCO3
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
Ca Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
Fe ChalcopyriteCuFeS2
Fe Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
Fe Goethiteα-Fe3+O(OH)
Fe Limonite(Fe,O,OH,H2O)
Fe SideriteFeCO3
Cu AzuriteCu3(CO3)2(OH)2
Cu ChalcopyriteCuFeS2
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu MalachiteCu2(CO3)(OH)2
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

Early Jurassic
174.1 - 201.3 Ma

ID: 2790643
Hampden Basalt

Age: Early Jurassic (174.1 - 201.3 Ma)

Stratigraphic Name: Hampden Basalt

Description: Greenish-gray to black (weathers bright orange to brown), fine- to medium-grained, grading from basalt near contacts to fine-grained gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass.

Comments: Part of Central Lowlands; Newark Terrane - Hartford and Pomperaug Mesozoic Basins. Part of Newark Supergroup (Upper Triassic and Lower Jurassic). Part of Meriden Formation of Krynine (1950) (Lower Jurassic); CT005. 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:{basalt,gabbro}

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]

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, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Gray, Norman H. (1982), Copper Occurrences In The Hartford Basin Of Northern Connecticut. In Guidebook for Fieldtrips in Connecticut and South Central Massachusetts, New England Intercollegiate Geological Conference, 74th Annual Meeting, Connecticut Department Of Environmental Protection Guidebook 5: 195-211.
Hubert, John F., Paul E. Feshbach-Meriney and Michael A. Smith. (1992), The Triassic-Jurassic Hartford Rift Basin, Connecticut And Massachusetts: Evolution, Sandstone Diagenesis, And Hydrocarbon History. AAPG Bulletin: 76(11).
Scovil, Jeffrey. (2008), Minerals of the Ellis Street Extension Road Cut, Route 72, New Britain, Connecticut. Rocks & Minerals: 83(2): 152-160.

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