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Tomasso Quarry (Tilcon Tomasso Quarry; Tilcon Quarry; Arborio Quarry), Farmington, Hartford Co., Connecticut, USAi
Regional Level Types
Tomasso Quarry (Tilcon Tomasso Quarry; Tilcon Quarry; Arborio Quarry)Quarry
Farmington- not defined -
Hartford Co.County

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Latitude & Longitude (WGS84): 41° 42' 17'' North , 72° 49' 40'' West
Latitude & Longitude (decimal): 41.70472,-72.82778
GeoHash:G#: drkjqb07t
Locality type:Quarry
Köppen climate type:Dfa : Hot-summer humid continental climate
Nearest Settlements:
Farmington25,000 (2017)1.7km
Plainville17,328 (2017)4.2km
New Britain72,808 (2017)6.3km
Newington30,562 (2017)8.7km
Kensington8,459 (2017)9.1km

A trap rock quarry in the Jurassic Holyoke Basalt, it was a very small roadside cut along the then new US Route 6 roadway in the 1934 aerial photo but continued into at least the 1990s. Tilcon uses it for recycling concrete and other materials. Many mid-20th century references (Schooner, Januzzi, Jones) generically call this locality the Farmington Trap Rock Quarry, which has lead to confusion with, or a loss of knowledge about, the older trap rock quarry near state Route 4 http://www.mindat.org/loc-238731.html that stopped working in the 1930s and was later filled in with municipal waste. Jones (1960) gives correct directions to this newer locality while calling it the "Farmington Trap Rock Quarry" and states that it "produced the best [prehnite] specimens for this study". Schooner (1961) notes that a prehnite specimen from here is on display at the Yale Peabody Museum, which appears to be this piece: http://www.mindat.org/photo-384064.html. A couple of specimens are on display at the Joe Webb Peoples Museum at Wesleyan University that were donated by Schooner and Peter Arborio, with labels that call it the "Arborio Quarry". That name is part of the history of Tilcon that can be found on their web site.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

8 valid minerals.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Group 9 - Silicates
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=3
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
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

List of minerals for each chemical element

H DatoliteCaB(SiO4)(OH)
H PectoliteNaCa2Si3O8(OH)
H PrehniteCa2Al2Si3O10(OH)2
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
B DatoliteCaB(SiO4)(OH)
C CalciteCaCO3
O DatoliteCaB(SiO4)(OH)
O CalciteCaCO3
O PectoliteNaCa2Si3O8(OH)
O QuartzSiO2
O PrehniteCa2Al2Si3O10(OH)2
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O AnhydriteCaSO4
Na PectoliteNaCa2Si3O8(OH)
Al PrehniteCa2Al2Si3O10(OH)2
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si DatoliteCaB(SiO4)(OH)
Si PectoliteNaCa2Si3O8(OH)
Si QuartzSiO2
Si PrehniteCa2Al2Si3O10(OH)2
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
S SphaleriteZnS
S AnhydriteCaSO4
Ca DatoliteCaB(SiO4)(OH)
Ca CalciteCaCO3
Ca PectoliteNaCa2Si3O8(OH)
Ca PrehniteCa2Al2Si3O10(OH)2
Ca AnhydriteCaSO4
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Zn SphaleriteZnS

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
174.1 - 201.3 Ma

ID: 2921544
Holyoke Basalt

Age: Early Jurassic (174.1 - 201.3 Ma)

Stratigraphic Name: Holyoke Basalt

Description: Greenish-gray to black (weathers bright orange to brown), fine- to coarse-grained, grading from basalt near contacts to 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 Macrostrat.org, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Jones, Robert W., Jr. (1960), Luminescent Minerals of Connecticut, a Guide to Their Properties and Locations. Fluorescent House, Branford, Connecticut.
Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.
Simpson, Howard E. (1966), Bedrock Geologic Map of the New Britain Quadrangle, Connecticut. US Geological Survey Map GQ-494.
Januzzi, Ronald E. (1976): The Mineral Localities of Connecticut and Southeastern New York State. Mineralogical Press, Danbury.
Henderson, William A. (1995), Microminerals of Connecticut, Rocks & Minerals: 70: 420-425.

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