Reed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry), Durham, Middlesex County, Connecticut, USAi
| Regional Level Types | |
|---|---|
| Reed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry) | Quarry |
| Durham | Town |
| Middlesex County | County |
| Connecticut | State |
| USA | Country |
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Latitude & Longitude (WGS84):
41° 28' 5'' North , 72° 43' 54'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Durham | 2,933 (2017) | 4.5km |
| Wallingford Center | 18,209 (2017) | 7.5km |
| Wallingford | 17,712 (2017) | 7.7km |
| Meriden | 59,988 (2017) | 10.0km |
| Middletown | 46,756 (2017) | 12.5km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Lapidary and Mineral Society of Central Connecticut | Meriden, Connecticut | 10km |
| New Haven Mineral Club | New Haven, Connecticut | 24km |
| Bristol Gem & Mineral Club | Bristol, Connecticut | 29km |
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.
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.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
21 valid minerals.
* - Minerals that have never been found, but their existence is inferred in some way (e.g. from pseudomorphs)
Detailed Mineral List:
| ⓘ Albite ? Formula: Na(AlSi3O8) Description: Very unusual for trap rock. References: |
| ⓘ Analcime Formula: Na(AlSi2O6) · H2O Habit: trapezohedral Colour: colorless Description: As micro crystals in mineralized fractures with quartz. References: |
| ⓘ Anhydrite Formula: CaSO4 Habit: tabular Description: Like at most trap rock localities, anhydrite crystallized early in the paragenesis in fractures and vesicles, but then dissolved away. Tabular molds in later-forming mineral assemblages (quartz, calcite, datolite) reveal its former presence. References: |
| ⓘ 'Apophyllite Group' Formula: AB4[Si8O20]X · 8H2O |
| ⓘ Aragonite Formula: CaCO3 References: |
| ⓘ 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. References: |
| ⓘ Babingtonite Formula: Ca2Fe2+Fe3+Si5O14(OH) Habit: complex prisms Colour: black Description: Micro crystals, but very specular and well formed. |
| ⓘ 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) References: Brunet, William M. (1980) Minerals of the Trap Rock Ridges of the Connecticut Valley: With Emphasis on Reed's Gap Quarry near Durham. Rocks & Minerals, 55 (6) 232-235 doi:10.1080/00357529.1980.11764675 |
| ⓘ 'Chabazite' Description: Yedlin (1962) describes them as the variety "phacolite" - seemingly twinned - "looking like hexagonal bi=pyramids". References: |
| ⓘ 'Chabazite var. Phacolite' |
| ⓘ Chalcopyrite Formula: CuFeS2 Habit: small crystals and massive Description: small bright crystals and massive |
| ⓘ Datolite Formula: CaB(SiO4)(OH) |
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ 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. References: |
| ✪ 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. References: Brunet, William M. (1980) Minerals of the Trap Rock Ridges of the Connecticut Valley: With Emphasis on Reed's Gap Quarry near Durham. Rocks & Minerals, 55 (6) 232-235 doi:10.1080/00357529.1980.11764675 |
| ⓘ 'Gmelinite Subgroup' ? Description: This mineral is unknown from Connecticut trap rock. Likely confusion with chabazite variety phacolite. |
| ⓘ Goethite Formula: Fe3+O(OH) Habit: botryoidal, fibrous Colour: dark brown Description: As tiny crystals and aggregates sprinkled on other minerals in mineralized fractures. References: |
| ⓘ Gypsum Formula: CaSO4 · 2H2O References: |
| ⓘ Gypsum var. Selenite Formula: CaSO4 · 2H2O References: |
| ⓘ 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. References: |
| ⓘ 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) |
| ⓘ 'Limonite' Habit: massive |
| ⓘ Prehnite Formula: Ca2Al2Si3O10(OH)2 |
| ⓘ 'Pumpellyite Subgroup' ? Formula: Ca2XAl2[Si2O6(OH)][SiO4](OH)2A 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. |
| ⓘ Pyrite Formula: FeS2 Habit: cubic Description: Micro crystals. References: |
| ⓘ Quartz Formula: SiO2 Habit: stubby prisms Colour: white to clear References: Brunet, William M. (1980) Minerals of the Trap Rock Ridges of the Connecticut Valley: With Emphasis on Reed's Gap Quarry near Durham. Rocks & Minerals, 55 (6) 232-235 doi:10.1080/00357529.1980.11764675 |
| ⓘ Quartz var. Amethyst Formula: SiO2 |
| ⓘ Quartz var. Blue Quartz Formula: SiO2 References: |
| ⓘ 'Stilbite Subgroup' Formula: M6-7[Al8-9Si27-28O72] · nH2O Habit: square edges lathlike |
| ⓘ Stilpnomelane Formula: K4Fe2+48[Si64Al8]O164(OH)52 · nH2O Habit: botryoidal aggregates Colour: bronze Description: As tiny botryoidal aggregates on other minerals in fractures. References: |
| ⓘ Titanite Formula: CaTiO(SiO4) References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 3 - Halides | |||
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Goethite | 4.00. | Fe3+O(OH) |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz var. Amethyst | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
| ⓘ | var. Blue Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Aragonite | 5.AB.15 | CaCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Anhydrite ? | 7.AD.30 | CaSO4 |
| ⓘ | Gypsum | 7.CD.40 | CaSO4 · 2H2O |
| ⓘ | var. Selenite | 7.CD.40 | CaSO4 · 2H2O |
| Group 9 - Silicates | |||
| ⓘ | Titanite | 9.AG.15 | CaTiO(SiO4) |
| ⓘ | Datolite | 9.AJ.20 | CaB(SiO4)(OH) |
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ | Augite | 9.DA.15 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| ⓘ | Babingtonite | 9.DK.05 | Ca2Fe2+Fe3+Si5O14(OH) |
| ⓘ | Prehnite | 9.DP.20 | Ca2Al2Si3O10(OH)2 |
| ⓘ | Fluorapophyllite-(K) | 9.EA.15 | KCa4(Si8O20)(F,OH) · 8H2O |
| ⓘ | Stilpnomelane | 9.EG.40 | K4Fe2+48[Si64Al8]O164(OH)52 · nH2O |
| ⓘ | Albite ? | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | Analcime | 9.GB.05 | Na(AlSi2O6) · H2O |
| ⓘ | Laumontite | 9.GB.10 | CaAl2Si4O12 · 4H2O |
| Unclassified | |||
| ⓘ | 'Apophyllite Group' | - | AB4[Si8O20]X · 8H2O |
| ⓘ | 'Chabazite' | - | |
| ⓘ | 'Gmelinite Subgroup' ? | - | |
| ⓘ | 'Limonite' | - | |
| ⓘ | 'Pumpellyite Subgroup' ? | - | Ca2XAl2[Si2O6(OH)][SiO4](OH)2A |
| ⓘ | 'Stilbite Subgroup' | - | M6-7[Al8-9Si27-28O72] · nH2O |
| ⓘ | 'Chabazite var. Phacolite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Analcime | Na(AlSi2O6) · H2O |
| H | ⓘ Apophyllite Group | AB4[Si8O20]X · 8H2O |
| H | ⓘ Babingtonite | Ca2Fe2+Fe3+Si5O14(OH) |
| H | ⓘ Datolite | CaB(SiO4)(OH) |
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| H | ⓘ Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| H | ⓘ Goethite | Fe3+O(OH) |
| H | ⓘ Gypsum | CaSO4 · 2H2O |
| H | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| H | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| H | ⓘ Pumpellyite Subgroup | Ca2XAl2[Si2O6(OH)][SiO4](OH)2A |
| H | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
| H | ⓘ Stilpnomelane | K4Fe482+[Si64Al8]O164(OH)52 · nH2O |
| H | ⓘ Gypsum var. Selenite | CaSO4 · 2H2O |
| B | Boron | |
| B | ⓘ Datolite | CaB(SiO4)(OH) |
| C | Carbon | |
| C | ⓘ Aragonite | CaCO3 |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Quartz var. Amethyst | SiO2 |
| O | ⓘ Analcime | Na(AlSi2O6) · H2O |
| O | ⓘ Anhydrite | CaSO4 |
| O | ⓘ Apophyllite Group | AB4[Si8O20]X · 8H2O |
| O | ⓘ Aragonite | CaCO3 |
| O | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| O | ⓘ Babingtonite | Ca2Fe2+Fe3+Si5O14(OH) |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Datolite | CaB(SiO4)(OH) |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| O | ⓘ Goethite | Fe3+O(OH) |
| O | ⓘ Gypsum | CaSO4 · 2H2O |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| O | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| O | ⓘ Pumpellyite Subgroup | Ca2XAl2[Si2O6(OH)][SiO4](OH)2A |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
| O | ⓘ Stilpnomelane | K4Fe482+[Si64Al8]O164(OH)52 · nH2O |
| O | ⓘ Titanite | CaTiO(SiO4) |
| O | ⓘ Gypsum var. Selenite | CaSO4 · 2H2O |
| O | ⓘ Quartz var. Blue Quartz | SiO2 |
| F | Fluorine | |
| F | ⓘ Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| F | ⓘ Fluorite | CaF2 |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Na | ⓘ Analcime | Na(AlSi2O6) · H2O |
| Mg | Magnesium | |
| Mg | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Analcime | Na(AlSi2O6) · H2O |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Al | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| Al | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Al | ⓘ Pumpellyite Subgroup | Ca2XAl2[Si2O6(OH)][SiO4](OH)2A |
| Al | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
| Al | ⓘ Stilpnomelane | K4Fe482+[Si64Al8]O164(OH)52 · nH2O |
| Si | Silicon | |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Quartz var. Amethyst | SiO2 |
| Si | ⓘ Analcime | Na(AlSi2O6) · H2O |
| Si | ⓘ Apophyllite Group | AB4[Si8O20]X · 8H2O |
| Si | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Si | ⓘ Babingtonite | Ca2Fe2+Fe3+Si5O14(OH) |
| Si | ⓘ Datolite | CaB(SiO4)(OH) |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| Si | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| Si | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Si | ⓘ Pumpellyite Subgroup | Ca2XAl2[Si2O6(OH)][SiO4](OH)2A |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
| Si | ⓘ Stilpnomelane | K4Fe482+[Si64Al8]O164(OH)52 · nH2O |
| Si | ⓘ Titanite | CaTiO(SiO4) |
| Si | ⓘ Quartz var. Blue Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Anhydrite | CaSO4 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Gypsum | CaSO4 · 2H2O |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Gypsum var. Selenite | CaSO4 · 2H2O |
| K | Potassium | |
| K | ⓘ Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| K | ⓘ Stilpnomelane | K4Fe482+[Si64Al8]O164(OH)52 · nH2O |
| Ca | Calcium | |
| Ca | ⓘ Anhydrite | CaSO4 |
| Ca | ⓘ Aragonite | CaCO3 |
| Ca | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Ca | ⓘ Babingtonite | Ca2Fe2+Fe3+Si5O14(OH) |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Datolite | CaB(SiO4)(OH) |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| Ca | ⓘ Fluorite | CaF2 |
| Ca | ⓘ Gypsum | CaSO4 · 2H2O |
| Ca | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| Ca | ⓘ Prehnite | Ca2Al2Si3O10(OH)2 |
| Ca | ⓘ Pumpellyite Subgroup | Ca2XAl2[Si2O6(OH)][SiO4](OH)2A |
| Ca | ⓘ Titanite | CaTiO(SiO4) |
| Ca | ⓘ Gypsum var. Selenite | CaSO4 · 2H2O |
| Ti | Titanium | |
| Ti | ⓘ Titanite | CaTiO(SiO4) |
| Fe | Iron | |
| Fe | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Fe | ⓘ Babingtonite | Ca2Fe2+Fe3+Si5O14(OH) |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Goethite | Fe3+O(OH) |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Stilpnomelane | K4Fe482+[Si64Al8]O164(OH)52 · nH2O |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Ganderia DomainDomain
- GranderiaPassive Margin
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References
Brunet, William M. (1980) Minerals of the Trap Rock Ridges of the Connecticut Valley: With Emphasis on Reed's Gap Quarry near Durham. Rocks & Minerals, 55 (6) 232-235 doi:10.1080/00357529.1980.11764675
Weber, Marcelle H., Sullivan, Earle C. (1995) Connecticut Mineral Locality Index. Rocks & Minerals, 70 (6) 396-409 doi:10.1080/00357529.1995.11761569p.403
Reed's Gap Quarry, Durham, Middlesex County, Connecticut, USA