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US Route 6 Willimantic Bypass expressway road cuts, Coventry, Tolland County, Connecticut, USAi
Regional Level Types
US Route 6 Willimantic Bypass expressway road cutsGroup of Road Cuttings
Coventry- not defined -
Tolland CountyCounty
ConnecticutState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
41° 43' 24'' North , 72° 16' 9'' West
Latitude & Longitude (decimal):
41.72333,-72.26917
GeoHash:
G#: drkt77x0n
GRN:
N28W40
Type:
Group of Road Cuttings
Köppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Willimantic17,737 (2017)5.3km
Mansfield City26,439 (2017)5.6km
South Coventry1,483 (2017)6.0km
Mansfield Center947 (2017)7.5km
Coventry Lake2,990 (2017)7.6km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Lapidary and Mineral Society of Central ConnecticutMeriden, Connecticut49km
Connecticut Valley Mineral ClubSpringfield, Massachusetts50km
Mindat Locality ID:
212277
Long-form identifier:
mindat:1:2:212277:2
GUID (UUID V4):
7703b86d-4c6b-43a0-87a5-4e817e105673


Completed in the early 1980s, the U.S. Route 6 Willimantic Bypass expressway is casually referred to as being in Willimantic, the nearby city. Actually it is not in the city's incorporated boundary and instead is situated in four towns - from west to east: Columbia, Coventry, Windham (which includes the city of Willimantic) and Mansfield. At the time of construction, it was intended to be part of Interstate I-84, but those plans were eventually abandoned. Because of this, old or incorrect labels may refer to the locality as I-84 or Route 84. Before the bypass, U.S. Route 6 used to pass through downtown Willimantic on a stretch of road that is now part of state Route 66.

The expressway begins in the town of Columbia, at a 4-way at-grade intersection with State Route 66. From here the expressway heads northeast and immediately crosses into the town of Coventry where the eastbound and westbound sides of the expressway split, with a hill in between them. The Coventry section contains by far the major road cuts on the expressway and produced specimens found in old collections. The road cuts expose gneiss of the Ordovician Tatnic Hill Formation (part of the Putnam-Nashoba Terrane), which here and in other places around the state can host sillimanite crystals in quartz-rich segregations. Fractures in the gneiss host drusy epidote, quartz, prehnite and zeolites. The locality coordinates are for this portion of the expressway.

The expressway then crosses the Willimantic River and enters the town of Windham. At the interchange with State Route 32 there are additional road cuts exposing gneiss of the Waterford Group (part of the Avalonian Terrane) and a small pegmatite dike, mostly on the ramps rather than on the highway, which include part of a small quarry. But these cuts are minor compared to those in Coventry.

After the Rt 32 interchange, the expressway enters the town of Mansfield. There are no bedrock road cuts in this section. After U. S. Route 6 Willimantic Bypass crosses the Natchaug River it once again enters Windham. 0.5 miles (0.80 km) after entering Windham, the U.S. Route 6 Willimantic Bypass ends at an interchange with State Route 66 and U. S. Route 6. There are no bedrock road cuts in this final section.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


14 valid minerals.

Detailed Mineral List:

ⓘ Albite
Formula: Na(AlSi3O8)
Colour: white to pink
Description: As rock forming matrix and as microscopic crystal overgrowths lining fractures.
ⓘ 'Amphibole Supergroup'
Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘ 'Amphibole Supergroup var. Byssolite'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Habit: capillary
Colour: white
Description: Scattered capillary crystals in fracture voids.
ⓘ Annite
Formula: KFe2+3(AlSi3O10)(OH)2
ⓘ Calcite
Formula: CaCO3
Habit: massive
Colour: white
Description: Massive material filling fracture voids.
ⓘ 'Chabazite'
Habit: rhombohedral
Colour: white
Description: drusy crystals on epidote in fractures in gneiss
ⓘ Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Habit: massive
Colour: dark green
Description: In matrix near hydrothermally altered fractures.
✪ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Habit: prismatic
Colour: yellow-green to dark green to black
Description: drusy crystals in fractures in gneiss, crystallized in two generations, an initial one with elongated, larger and darker crystals and a second one of much finer-grained, short and lighter colored crystals. The second generation coats the first and some other minerals like quartz.
ⓘ Goethite
Formula: α-Fe3+O(OH)
Habit: cubic (pseudomorph)
Colour: brown
Description: Pseudomorphs of microscopic pyrite crystals in fractures.
ⓘ 'Heulandite Subgroup'
Formula: (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Colour: colorless to white
Description: micro drusy crystals with epidote and zeolites in fractures in gneiss
ⓘ 'Hornblende Root Name Group'
Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Microcline
Formula: K(AlSi3O8)
Habit: massive
Colour: white
Fluorescence: deep red
Description: in pegmatites cross-cutting the gneiss within the road cuts
ⓘ Molybdenite
Formula: MoS2
Habit: tabular, subhedral
Colour: silvery gray
Description: crystal 23 mm collected by Fred Schuster during construction
ⓘ Prehnite
Formula: Ca2Al2Si3O10(OH)2
Habit: platy aggregates
Colour: pale green
Description: drusy crystal aggregates with zeolites and epidote in fractures in gneiss
ⓘ Pyrite
Formula: FeS2
Habit: cubic
Description: Microscopic crystals in fractures altered to goethite.
ⓘ Quartz
Formula: SiO2
Habit: elongated prismatic
Colour: colorless to white
Description: drusy crystals with epidote and zeolites in fractures in gneiss
✪ Sillimanite
Formula: Al2(SiO4)O
Habit: elongated prisms
Colour: brown
Description: Crystals to 7 cm in subparallel alignment in quartz-rich segregations, just like at Chester, Norwich and Willimantic - all from exposures of the Tatnic Hill Formation.
ⓘ 'Stilbite Subgroup'
Formula: M6-7[Al8-9Si27-28O72] · nH2O
Habit: platy
Description: drusy crystals with epidote and zeolites in fractures in gneiss
ⓘ Titanite
Formula: CaTi(SiO4)O

Gallery:

(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)ⓘ Epidote
Ca2Al2Si3O10(OH)2ⓘ Prehnite
M6-7[Al8-9Si27-28O72] · nH2Oⓘ 'Stilbite Subgroup'

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘMolybdenite2.EA.30MoS2
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘGoethite4.00.α-Fe3+O(OH)
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
Group 9 - Silicates
ⓘSillimanite9.AF.05Al2(SiO4)O
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘPrehnite9.DP.20Ca2Al2Si3O10(OH)2
ⓘAnnite9.EC.20KFe2+3(AlSi3O10)(OH)2
ⓘClinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
ⓘMicrocline9.FA.30K(AlSi3O8)
ⓘAlbite9.FA.35Na(AlSi3O8)
Unclassified
ⓘ'Amphibole Supergroup'-AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘ'Heulandite Subgroup'-(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
ⓘ'Stilbite Subgroup'-M6-7[Al8-9Si27-28O72] · nH2O
ⓘ'Chabazite'-
ⓘ'Hornblende Root Name Group'-◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
ⓘ'Amphibole Supergroup
var. Byssolite'		-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2

List of minerals for each chemical element

HHydrogen
Hⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Hⓘ AnniteKFe32+(AlSi3O10)(OH)2
Hⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ Goethiteα-Fe3+O(OH)
Hⓘ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Hⓘ PrehniteCa2Al2Si3O10(OH)2
Hⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Hⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Hⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
CCarbon
Cⓘ CalciteCaCO3
OOxygen
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Oⓘ AnniteKFe32+(AlSi3O10)(OH)2
Oⓘ CalciteCaCO3
Oⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ Goethiteα-Fe3+O(OH)
Oⓘ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MicroclineK(AlSi3O8)
Oⓘ PrehniteCa2Al2Si3O10(OH)2
Oⓘ QuartzSiO2
Oⓘ SillimaniteAl2(SiO4)O
Oⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Oⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
FFluorine
Fⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Fⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Fⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
NaSodium
Naⓘ AlbiteNa(AlSi3O8)
Naⓘ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
MgMagnesium
Mgⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
AlAluminium
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Alⓘ AnniteKFe32+(AlSi3O10)(OH)2
Alⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Alⓘ MicroclineK(AlSi3O8)
Alⓘ PrehniteCa2Al2Si3O10(OH)2
Alⓘ SillimaniteAl2(SiO4)O
Alⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Alⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Alⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SiSilicon
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Siⓘ AnniteKFe32+(AlSi3O10)(OH)2
Siⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Siⓘ MicroclineK(AlSi3O8)
Siⓘ PrehniteCa2Al2Si3O10(OH)2
Siⓘ QuartzSiO2
Siⓘ SillimaniteAl2(SiO4)O
Siⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Siⓘ TitaniteCaTi(SiO4)O
Siⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Siⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SSulfur
Sⓘ MolybdeniteMoS2
Sⓘ PyriteFeS2
ClChlorine
Clⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Clⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Clⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
Kⓘ AnniteKFe32+(AlSi3O10)(OH)2
Kⓘ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Kⓘ MicroclineK(AlSi3O8)
CaCalcium
Caⓘ CalciteCaCO3
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Caⓘ PrehniteCa2Al2Si3O10(OH)2
Caⓘ TitaniteCaTi(SiO4)O
Caⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
TiTitanium
Tiⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Tiⓘ TitaniteCaTi(SiO4)O
Tiⓘ Amphibole Supergroup var. ByssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
FeIron
Feⓘ AnniteKFe32+(AlSi3O10)(OH)2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ Goethiteα-Fe3+O(OH)
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ PyriteFeS2
MoMolybdenum
Moⓘ MolybdeniteMoS2

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