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Connecticut Yankee atomic power plant, Haddam Neck, Haddam, Middlesex Co., Connecticut, USAi
Regional Level Types
Connecticut Yankee atomic power plant- not defined -
Haddam Neck- not defined -
Haddam- not defined -
Middlesex Co.County
ConnecticutState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84): 41° 28' 54'' North , 72° 29' 56'' West
Latitude & Longitude (decimal): 41.48194,-72.49889
GeoHash:G#: drk7ypxcv
Köppen climate type:Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
East Haddam9,042 (2017)4.5km
Moodus1,413 (2017)4.7km
Higganum1,698 (2017)5.1km
Chester Center1,558 (2017)9.8km
East Hampton2,691 (2017)10.5km


This power plant was built in the late 1960s on a terrace along the NE side of the Connecticut River. During construction, a bedrock knob and slope were blasted to make way for the reactor containment dome and turbine buildings and the rock rubble was spread out to the NW of the knob to fill a wetland that later became the parking lot. It was during this period that collecting was done, but most exposures are now covered. The plant was built at the foot of the steep slopes that host the SE part of the abandoned Quarry Hill stone quarries and so shares a similar geology of mostly vertically-layered black mica/dark amphibole gneiss with numerous small, cross-cutting pegmatites. The mineralogy is a combination of species found in the gneiss and in the pegmatites and is also similar to that found in the Quarry Hill quarries (though better documented) and in the Arnold and Long Hill dimension stone quarries along the bedrock strike southward across the river in Haddam. The plant was decommissioned by 2007 and the site reclaimed, but access to it and the slopes above it hosting some of the Quarry Hill quarries is still restricted.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


20 valid minerals.

Detailed Mineral List:

Actinolite
Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: Rocks & Minerals (1995) 70:396-409
Albite
Formula: Na(AlSi3O8)
Reference: Rocks & Minerals (1995) 70:396-409
Allanite-(Ce)
Formula: {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Colour: black
Description: striated, terminated crystals up to 1 cm
Reference: Robinson, George W. and Vandall T. King. (1988), What's New in Minerals? Mineralogical Record: 19(5): 332.
Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: Rocks & Minerals (1995) 70:396-409
Bertrandite
Formula: Be4(Si2O7)(OH)2
Reference: Rocks & Minerals (1995) 70:396-409
Beryl
Formula: Be3Al2(Si6O18)
Reference: Rocks & Minerals (1995) 70:396-409
'Chabazite'
Habit: phacolite twins
Colour: orange
Reference: Tschernich, R. (1992): Zeolites of the World, p.114; Rocks & Minerals (1995) 70:396-409
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Rocks & Minerals (1995) 70:396-409
Gonnardite
Formula: (Na,Ca)2(Si,Al)5O10 · 3H2O
Reference: Tschernich, R. (1992): Zeolites of the World, p.114
'Heulandite subgroup'
Reference: Kevin Czaja Collection, Ex: Marcelle Weber Coll: m2405. 4-22-65
Meta-autunite
Formula: Ca(UO2)2(PO4)2 · 6-8H2O
Reference: Harold Moritz field observations during decommissioning.
Microcline
Formula: K(AlSi3O8)
Reference: Harold Moritz field observations during decommissioning.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Harold Moritz field observations during decommissioning.
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Reference: Tschernich, R. (1992): Zeolites of the World, p.114; Rocks & Minerals (1995) 70:396-409
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Reference: Rocks & Minerals (1995) 70:396-409
Pyrite
Formula: FeS2
Habit: massive to subhedral
Colour: brassy
Description: In a quartz segregation in gneiss, collected by Richard Schooner.
Reference: Wesleyan University collection
Quartz
Formula: SiO2
Reference: Harold Moritz field observations during decommissioning.
Quartz var: Smoky Quartz
Formula: SiO2
Reference: Harold Moritz field observations during decommissioning.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Harold Moritz field observations during decommissioning.
Sillimanite
Formula: Al2(SiO4)O
Reference: Harold Moritz collection
'Stilbite subgroup'
Reference: Tschernich, R. (1992): Zeolites of the World, p.114
Thorite
Formula: Th(SiO4)
Description: Yale Peabody Museum specimen 044598.
Reference: Rocks & Minerals (1995) 70:396-409
Titanite
Formula: CaTi(SiO4)O
Reference: Rocks & Minerals (1995) 70:396-409
Zoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Reference: Rocks & Minerals (1995) 70:396-409
Zoisite var: Thulite
Formula: {Ca2}{Al,Mn3+3}(Si2O7)(SiO4)O(OH)
Reference: Rocks & Minerals (1995) 70:396-409

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
Group 8 - Phosphates, Arsenates and Vanadates
Meta-autunite8.EB.10Ca(UO2)2(PO4)2 · 6-8H2O
Group 9 - Silicates
Actinolite9.DE.10☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Albite9.FA.35Na(AlSi3O8)
Allanite-(Ce)9.BG.05b{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Almandine9.AD.25Fe2+3Al2(SiO4)3
Bertrandite9.BD.05Be4(Si2O7)(OH)2
Beryl9.CJ.05Be3Al2(Si6O18)
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Gonnardite9.GA.05(Na,Ca)2(Si,Al)5O10 · 3H2O
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Sillimanite9.AF.05Al2(SiO4)O
Thorite9.AD.30Th(SiO4)
Titanite9.AG.15CaTi(SiO4)O
Zoisite9.BG.10{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
var: Thulite9.BG.10{Ca2}{Al,Mn3+3}(Si2O7)(SiO4)O(OH)
Unclassified Minerals, Rocks, etc.
'Chabazite'-
'Heulandite subgroup'-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
AB2(XO4)2·xH2O, containing (UO2)2+
Meta-autunite40.2a.1.2Ca(UO2)2(PO4)2 · 6-8H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Thorite51.5.2.3Th(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Sillimanite52.2.2a.1Al2(SiO4)O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with cations in [4] coordination
Bertrandite56.1.1.1Be4(Si2O7)(OH)2
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)
Allanite-(Ce)58.2.1a.1{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Zoisite58.2.1b.1{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
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
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
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Gonnardite77.1.5.7(Na,Ca)2(Si,Al)5O10 · 3H2O
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Mixtures, etc.
Actinolite-☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
'Chabazite'-
'Heulandite subgroup'-
Quartz
var: Smoky Quartz
-SiO2
'Stilbite subgroup'-
Zoisite
var: Thulite
-{Ca2}{Al,Mn3+3}(Si2O7)(SiO4)O(OH)

List of minerals for each chemical element

HHydrogen
H NatroliteNa2Al2Si3O10 · 2H2O
H Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H BertranditeBe4(Si2O7)(OH)2
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H PrehniteCa2Al2Si3O10(OH)2
H Zoisite (var: Thulite){Ca2}{Al,Mn33+}(Si2O7)(SiO4)O(OH)
H MuscoviteKAl2(AlSi3O10)(OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O
H Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
H Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
BeBeryllium
Be BertranditeBe4(Si2O7)(OH)2
Be BerylBe3Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O NatroliteNa2Al2Si3O10 · 2H2O
O Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O AlbiteNa(AlSi3O8)
O AlmandineFe32+Al2(SiO4)3
O BertranditeBe4(Si2O7)(OH)2
O BerylBe3Al2(Si6O18)
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O PrehniteCa2Al2Si3O10(OH)2
O ThoriteTh(SiO4)
O TitaniteCaTi(SiO4)O
O Zoisite (var: Thulite){Ca2}{Al,Mn33+}(Si2O7)(SiO4)O(OH)
O MicroclineK(AlSi3O8)
O Quartz (var: Smoky Quartz)SiO2
O MuscoviteKAl2(AlSi3O10)(OH)2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O
O SillimaniteAl2(SiO4)O
O Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
O Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
O QuartzSiO2
NaSodium
Na NatroliteNa2Al2Si3O10 · 2H2O
Na Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
Na AlbiteNa(AlSi3O8)
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
AlAluminium
Al NatroliteNa2Al2Si3O10 · 2H2O
Al Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
Al AlbiteNa(AlSi3O8)
Al AlmandineFe32+Al2(SiO4)3
Al BerylBe3Al2(Si6O18)
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al PrehniteCa2Al2Si3O10(OH)2
Al Zoisite (var: Thulite){Ca2}{Al,Mn33+}(Si2O7)(SiO4)O(OH)
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al SillimaniteAl2(SiO4)O
Al Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Al Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
SiSilicon
Si NatroliteNa2Al2Si3O10 · 2H2O
Si Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si AlbiteNa(AlSi3O8)
Si AlmandineFe32+Al2(SiO4)3
Si BertranditeBe4(Si2O7)(OH)2
Si BerylBe3Al2(Si6O18)
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si PrehniteCa2Al2Si3O10(OH)2
Si ThoriteTh(SiO4)
Si TitaniteCaTi(SiO4)O
Si Zoisite (var: Thulite){Ca2}{Al,Mn33+}(Si2O7)(SiO4)O(OH)
Si MicroclineK(AlSi3O8)
Si Quartz (var: Smoky Quartz)SiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si SillimaniteAl2(SiO4)O
Si Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Si Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Si QuartzSiO2
PPhosphorus
P Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O
SSulfur
S PyriteFeS2
KPotassium
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca PrehniteCa2Al2Si3O10(OH)2
Ca TitaniteCaTi(SiO4)O
Ca Zoisite (var: Thulite){Ca2}{Al,Mn33+}(Si2O7)(SiO4)O(OH)
Ca Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O
Ca Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Ca Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
TiTitanium
Ti TitaniteCaTi(SiO4)O
MnManganese
Mn Zoisite (var: Thulite){Ca2}{Al,Mn33+}(Si2O7)(SiO4)O(OH)
FeIron
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe AlmandineFe32+Al2(SiO4)3
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Fe PyriteFeS2
CeCerium
Ce Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
ThThorium
Th ThoriteTh(SiO4)
UUranium
U Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O

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

Devonian - Silurian
358.9 - 443.8 Ma



ID: 3186140
Paleozoic sedimentary and volcanic rocks

Age: Paleozoic (358.9 - 443.8 Ma)

Lithology: Mudstone-carbonate-sandstone-conglomerate

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]

Middle Ordovician - Early Ordovician
458.4 - 485.4 Ma



ID: 3017559
Monson Gneiss

Age: Ordovician (458.4 - 485.4 Ma)

Stratigraphic Name: Monson Gneiss

Description: (May be equivalent to part of Waterford Group) - Interlayered light to dark, mostly medium to coarse-grained gneiss and amphibolite; gneiss composed of plagioclase, quartz, and biotite, with hornblende in some layers and microcline in others; traces of garnet, epidote, and magnetite.

Comments: Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Bronson Hill Anticlinorium. Swanzey, Pauchaug, Monson, and Fourmile Gneisses represent metamorphosed intrusive igneous rocks and yield ages from 454 to 442+3/-2 Ma. Therefore, ages range from early Late through latest Ordovician. Authors suggest that they represent the plutonic root of a calc-alkaline magmatic arc at least 250 km long that was produced partly or entirely on a continental margin in the Late Ordovician. The overlying Ammonoosuc Volcanics and Partridge Formation, rather that resting unconformably on these plagioclase-rich plutonic gneiss, are now known to have had a magmatic history overlapping with them and are approximately the same age (Tucker and Robinson, 1990) per CT012. 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:{gneiss,amphibolite}

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]

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)
Robinson, George W. and Vandall T. King. (1988), What's New in Minerals? Mineralogical Record: 19(5): 332.
Tschernich, R. (1992): Zeolites of the World. Geoscience Press, Phoenix, p. 114, 225.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), Vol. 70, No. 6, p. 402.

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