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Reed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry), Durham, Middlesex Co., Connecticut, USAi
Regional Level Types
Reed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry)Quarry
Durham- not defined -
Middlesex Co.County
ConnecticutState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84): 41° 28' 5'' North , 72° 43' 54'' West
Latitude & Longitude (decimal): 41.46818,-72.73191
GeoHash:G#: drk7bvn1x
Locality type:Quarry
Köppen climate type:Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Durham2,933 (2017)4.5km
Wallingford Center18,209 (2017)7.5km
Wallingford17,712 (2017)7.7km
Meriden59,988 (2017)10.0km
Middletown46,756 (2017)12.5km


This basalt (trap rock) quarry is located 7.1 km (4.4 miles) ENE of Wallingford center, New Haven County, and some references such as Ryerson (1972) place it in this town. Although it is on Wallingford's eastern border, it is however, mostly in Durham, Middlesex County and it was referred to by Tilcon as their Durham quarry in Brunet (1980), but has a Wallingford address on Tilcon's web site because the office is on the west side of the property in that town. Newton (2004) indicates it has operated at least since 1939 and perhaps even 10 years earlier as Tidewater Trap Rock Company.

The rock is not heavily mineralized compared to some other trap rock quarries, most good minerals here occur in thin open cracks and fault zones rather than in gas vesicles. It is best known for its fluorite crystals, which occur in a cross-cutting hydrothermal fault breccia with calcite.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


18 valid minerals.

Detailed Mineral List:

Albite ?
Formula: Na(AlSi3O8)
Description: Very unusual for trap rock.
Reference: Rocks & Min.: 70:423
Analcime
Formula: Na(AlSi2O6) · H2O
Habit: trapezohedral
Colour: colorless
Description: As micro crystals in mineralized fractures with quartz.
Reference: Mike Polletta Specimen
Anhydrite
Formula: CaSO4
Habit: tabular
Description: Like at most trap rock localities, anhydrite crystallized early in the secondary paragenesis in fractures and vesicles, but then dissolved away. Tabular molds in later-forming mineral assemblages (quartz, calcite, datolite) reveal its former presence.
Reference: Harold Moritz collection
'Apophyllite'
Reference: P Cristofono collection; Rocks & Minerals (1995) 70:396-409; Rocks & Minerals (1995) 70:396-409
Aragonite
Formula: CaCO3
Reference: Collected by A. Berluti in 2007
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Habit: short prismatec
Colour: black
Description: With anorthite one of the two major rock-forming constituents of the basalt and normally very fine-grained and not of collector interest. However, euhedral phenocrysts to about 1 cm rarely occur.
Reference: Harold Moritz collection
Babingtonite
Formula: Ca2(Fe,Mn)FeSi5O14(OH)
Habit: complex prisms
Colour: black
Description: Micro crystals, but very specular and well formed.
Reference: Rocks & Min.: 70:423; Rocks & Minerals (1995) 70:396-409; Rocks & Minerals (1995) 70:396-409
Calcite
Formula: CaCO3
Habit: scalenohedral, rhombohedral
Colour: white to clear
Fluorescence: magenta under all wavelengths but best under MW
Description: highly modified scalenohedrons (Brunet 1980)
Reference: Pawloski, John. (2006), Connecticut. in: Fluorite, The Collector's Choice. Lithographie, East Hampton, Connecticut: 64.; Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 403.; Brunet, William M. (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals: 55 (6): 232-5.
'Chabazite'
Description: Yedlin (1962) describes them as the variety "phacolite" - seemingly twinned - "looking like hexagonal bi=pyramids".
Reference: P Cristofono collection; Yedlin, Neal. (1962), The Micro-mounter. Rocks and Minerals: 37(5-6): 248.; Brunet, William M. (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals: 55 (6): 232-5.
'Chabazite var: Phacolite'
Reference: Kevin Czaja Collection, Ex: Marcelle Weber Coll: m1236
Chalcopyrite
Formula: CuFeS2
Habit: small crystals and massive
Description: small bright crystals and massive
Reference: Brunet, William M. (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals, Volume 55, Number 6.
Datolite
Formula: CaB(SiO4)(OH)
Reference: Rocks & Minerals (1995) 70:396-409; Rocks & Minerals (1995) 70:396-409; Brunet (1980)
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Kevin Czaja Collection, Ex: Marcelle Weber Coll: m1803, m1236 respectively
Fluorapophyllite-(K)
Formula: KCa4(Si8O20)(F,OH) · 8H2O
Habit: elongated prisms modified by pyramids and pinacoids or tabular dominated by pinacoids
Colour: colorless, pale pink to white or pale yellow (tabular aggregates)
Description: In fractures typically with calcite and datolite, crystals usually small <1 cm, as individual prismatic or botryoidal aggregates of tabular crystals that resemble typical prehnite aggregates except for their pale yellow color.
Reference: Harold Moritz collection
Fluorite
Formula: CaF2
Habit: octahedral
Colour: light ot medium green, purple
Fluorescence: blue under all wavelengths
Description: "Green octahedrons w/quartz and calcite crystals. Octahedrons up to ½” but larger broken crystals found. Also purple massive and micro crystals." Brunet (1980). Pawloski (2006) - crystals to 1.6 cm.
Reference: Brunet, William M. (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals: 55 (6): 232-5.; Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 403.; Pawloski, John. (2006), Connecticut. in: Fluorite, The Collector's Choice. Lithographie, East Hampton, Connecticut: 64.
'Gmelinite' ?
Description: This mineral is unknown from Connecticut trap rock. Likely confusion with chabazite variety phacolite.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 403.
Gypsum
Formula: CaSO4 · 2H2O
Reference: Sean Flanagan Specimen
Gypsum var: Selenite
Formula: CaSO4 · 2H2O
Reference: Sean Flanagan Specimen
Hematite
Formula: Fe2O3
Habit: botryoidal
Colour: maroon
Description: As tiny flakes or hemispheres, commonly crystallized preferentially along the edges of scalenohedral calcite crystals and on and within their terminal areas.
Reference: Harold Moritz collection
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Colour: flesh to pink
Description: "flesh-colored to pink laumontite were found. These crystals, occurring in vugs and on a few surfaces, are splintery and of matchstick size. Some vein material was also present. The largest specimen, 10 by 6 inches in size, contains excellent vug material associated with prehnite as well as veins of laumontite." Brunet (1980)
Reference: Brunet (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals, Volume 55, Number 6.
'Limonite'
Formula: (Fe,O,OH,H2O)
Habit: massive
Reference: Brunet (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals, Volume 55, Number 6.
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Reference: Rocks & Minerals (1995) 70:396-409; Rocks & Minerals (1995) 70:396-409; Brunet (1980).
'Pumpellyite' ?
Colour: green
Description: Described by Yedlin (1962) as "fine green mounds of clinochlore", but most likely actually pumpellyite given its prevalence at other basalt quarries in the area.
Reference: Yedlin, Neal. (1962), The Micro-mounter. Rocks and Minerals: 37(5-6): 248.
Pyrite
Formula: FeS2
Habit: cubic
Description: Micro crystals.
Reference: Yedlin, Neal. (1962), The Micro-mounter. Rocks and Minerals: 37(5-6): 248.; Personally collected by A. Berluti in 2007; Brunet (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals, Volume 55, Number 6.
Quartz
Formula: SiO2
Habit: stubby prisms
Colour: white to clear
Reference: Yedlin, Neal. (1962), The Micro-mounter. Rocks and Minerals: 37(5-6): 248.; Fluorite: The Collector's Choice. Pawloski, John. (2006), Connecticut. in Fluorite: The Collector's Choice. Lithographie, East Hampton, Connecticut: 64.; Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 403.; Brunet, William M. (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals: 55 (6): 232-5.
Quartz var: Amethyst
Formula: SiO2
Reference: Collected ny Adam Berluti in 2010; Brunet, William M. (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals, Volume 55, Number 6.
Quartz var: Blue Quartz
Formula: SiO2
Reference: Peter Cristofono collection, 2018
'Stilbite subgroup'
Habit: square edges lathlike
Reference: Yedlin, Neal. (1962), The Micro-mounter. Rocks and Minerals: 37(5-6): 248.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Blue Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Aragonite5.AB.15CaCO3
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anhydrite7.AD.30CaSO4
Gypsum7.CD.40CaSO4 · 2H2O
var: Selenite7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
Albite ?9.FA.35Na(AlSi3O8)
Analcime9.GB.05Na(AlSi2O6) · H2O
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Babingtonite9.DK.05Ca2(Fe,Mn)FeSi5O14(OH)
Datolite9.AJ.20CaB(SiO4)(OH)
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fluorapophyllite-(K)9.EA.15KCa4(Si8O20)(F,OH) · 8H2O
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Unclassified Minerals, Rocks, etc.
'Apophyllite'-
'Chabazite'-
'var: Phacolite'-
'Gmelinite' ?-
'Limonite'-(Fe,O,OH,H2O)
'Pumpellyite' ?-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anhydrite28.3.2.1CaSO4
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 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Single-Width Unbranched Chains, W=1 with chains P=5
Babingtonite65.4.1.2Ca2(Fe,Mn)FeSi5O14(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
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
Fluorapophyllite-(K)72.3.1.1KCa4(Si8O20)(F,OH) · 8H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite ?76.1.3.1Na(AlSi3O8)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Unclassified Minerals, Mixtures, etc.
'Apophyllite'-
Aragonite-CaCO3
'Chabazite'-
'var: Phacolite'-
'Gmelinite' ?-
Gypsum
var: Selenite
-CaSO4 · 2H2O
'Limonite'-(Fe,O,OH,H2O)
'Pumpellyite' ?-
Quartz
var: Amethyst
-SiO2
var: Blue Quartz-SiO2
'Stilbite subgroup'-

List of minerals for each chemical element

HHydrogen
H BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
H DatoliteCaB(SiO4)(OH)
H PrehniteCa2Al2Si3O10(OH)2
H Limonite(Fe,O,OH,H2O)
H LaumontiteCaAl2Si4O12 · 4H2O
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Gypsum (var: Selenite)CaSO4 · 2H2O
H AnalcimeNa(AlSi2O6) · H2O
H GypsumCaSO4 · 2H2O
H Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
C AragoniteCaCO3
OOxygen
O BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
O CalciteCaCO3
O QuartzSiO2
O DatoliteCaB(SiO4)(OH)
O PrehniteCa2Al2Si3O10(OH)2
O Quartz (var: Amethyst)SiO2
O AragoniteCaCO3
O Limonite(Fe,O,OH,H2O)
O LaumontiteCaAl2Si4O12 · 4H2O
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Gypsum (var: Selenite)CaSO4 · 2H2O
O AnalcimeNa(AlSi2O6) · H2O
O GypsumCaSO4 · 2H2O
O Quartz (var: Blue Quartz)SiO2
O Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
O AnhydriteCaSO4
O HematiteFe2O3
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O AlbiteNa(AlSi3O8)
FFluorine
F FluoriteCaF2
F Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
NaSodium
Na AnalcimeNa(AlSi2O6) · H2O
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
AlAluminium
Al PrehniteCa2Al2Si3O10(OH)2
Al LaumontiteCaAl2Si4O12 · 4H2O
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al AnalcimeNa(AlSi2O6) · H2O
Al AlbiteNa(AlSi3O8)
SiSilicon
Si BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Si QuartzSiO2
Si DatoliteCaB(SiO4)(OH)
Si PrehniteCa2Al2Si3O10(OH)2
Si Quartz (var: Amethyst)SiO2
Si LaumontiteCaAl2Si4O12 · 4H2O
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si AnalcimeNa(AlSi2O6) · H2O
Si Quartz (var: Blue Quartz)SiO2
Si Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si AlbiteNa(AlSi3O8)
SSulfur
S PyriteFeS2
S ChalcopyriteCuFeS2
S Gypsum (var: Selenite)CaSO4 · 2H2O
S GypsumCaSO4 · 2H2O
S AnhydriteCaSO4
KPotassium
K Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
CaCalcium
Ca FluoriteCaF2
Ca BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Ca CalciteCaCO3
Ca DatoliteCaB(SiO4)(OH)
Ca PrehniteCa2Al2Si3O10(OH)2
Ca AragoniteCaCO3
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca Gypsum (var: Selenite)CaSO4 · 2H2O
Ca GypsumCaSO4 · 2H2O
Ca Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Ca AnhydriteCaSO4
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
MnManganese
Mn BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
FeIron
Fe BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Fe PyriteFeS2
Fe Limonite(Fe,O,OH,H2O)
Fe ChalcopyriteCuFeS2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe HematiteFe2O3
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
CuCopper
Cu ChalcopyriteCuFeS2

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: 2779471
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]

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)
Schairer, J. F. (1931): The Minerals of Connecticut. State Geological and Natural History Survey, Bulletin 51. Hartford, Conn.
Yedlin, Neal. (1962), The Micro-mounter. Rocks and Minerals: 37(5-6): 248.
Ryerson, Kathleen H. (1972): Rock Hounds Guide to Connecticut. Pequot Press.
Brunet, William M. (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals: 55 (6): 232-5.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 403.
Henderson, William A. (1995): Microminerals of Connecticut; Rocks & Minerals (Connecticut Issue): 70 (6): 420-425.
Pawloski, John. (2006), Connecticut. in: Fluorite, The Collector's Choice. Lithographie, East Hampton, Connecticut: 64.

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