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Lyman Viaduct at Dickinson Creek, Westchester, Colchester, New London County, Connecticut, USAi
Regional Level Types
Lyman Viaduct at Dickinson CreekCreek
Westchester- not defined -
Colchester- not defined -
New London CountyCounty
ConnecticutState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
41° 33' 49'' North , 72° 26' 59'' West
Latitude & Longitude (decimal):
41.56371,-72.44973
GeoHash:
G#: drkkrq7wn
GRN:
N28W40
Type:
Creek
Köppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
East Hampton2,691 (2017)4.6km
Lake Pocotopaug3,436 (2017)6.3km
Moodus1,413 (2017)6.8km
Terramuggus1,025 (2017)8.1km
Colchester4,781 (2017)9.9km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Lapidary and Mineral Society of Central ConnecticutMeriden, Connecticut30km
Bristol Gem & Mineral ClubBristol, Connecticut43km
New Haven Mineral ClubNew Haven, Connecticut49km
Mindat Locality ID:
54243
Long-form identifier:
mindat:1:2:54243:9
GUID (UUID V4):
5eb498b9-3cc2-4549-9b04-278fc98a0e5b


Former popular gem "pyrope" garnet (really almandine) digging locality, in Dickinson Creek stream bed at the culvert outfall under the Lyman Viaduct on the Air Line Trail (former railroad bed) in the Salmon River State Forest. Rounded alluvial garnet crystals up to 1 cm. Cut gems up to 2.5 carets are known.

Connecticut's only authenticated diamond (0.8mm cubic grey crystal) was found during analyses of garnet sands from here in the late 1960s.

In 2012, mainly to stop the diving and swimming that went on here, the state filled the plunge pool with large boulders.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


4 valid minerals. 2 erroneous literature entries.

Detailed Mineral List:

✪ Almandine
Formula: Fe2+3Al2(SiO4)3
Colour: ruby red
Description: Rounded alluvial garnet crystals up to 1 cm. Cut gems up to 2.5 carets are known.
ⓘ 'Almandine-Pyrope Series var. Rhodolite'
Formula: Mg3Al2(SiO4)3
Description: Although many local amateur gem cutters believe the garnets here to be pyrope-dominant, analyses show them to be almandine-dominant.
ⓘ 'Amphibole Supergroup'
Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Diamond
Formula: C
Habit: cubic
Colour: grey
Description: Single alluvial crystal 0.8mm
ⓘ Pyrope
Formula: Mg3Al2(SiO4)3
Description: Although many local amateur gem cutters believe the garnets here to be pyrope-dominant, analyses show them to be almandine-dominant.
ⓘ Quartz
Formula: SiO2
ⓘ Staurolite
Formula: Fe2+2Al9Si4O23(OH)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘDiamond1.CB.10aC
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Group 9 - Silicates
ⓘAlmandine9.AD.25Fe2+3Al2(SiO4)3
ⓘPyrope ?9.AD.25Mg3Al2(SiO4)3
ⓘStaurolite9.AF.30Fe2+2Al9Si4O23(OH)
Unclassified
ⓘ'Amphibole Supergroup'-AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Almandine-Pyrope Series
var. Rhodolite' ?		-Mg3Al2(SiO4)3

List of minerals for each chemical element

HHydrogen
Hⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ StauroliteFe22+Al9Si4O23(OH)
CCarbon
Cⓘ DiamondC
OOxygen
Oⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Oⓘ AlmandineFe32+Al2(SiO4)3
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ PyropeMg3Al2(SiO4)3
Oⓘ QuartzSiO2
Oⓘ StauroliteFe22+Al9Si4O23(OH)
Oⓘ Almandine-Pyrope Series var. RhodoliteMg3Al2(SiO4)3
FFluorine
Fⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ PyropeMg3Al2(SiO4)3
Mgⓘ Almandine-Pyrope Series var. RhodoliteMg3Al2(SiO4)3
AlAluminium
Alⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Alⓘ AlmandineFe32+Al2(SiO4)3
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ PyropeMg3Al2(SiO4)3
Alⓘ StauroliteFe22+Al9Si4O23(OH)
Alⓘ Almandine-Pyrope Series var. RhodoliteMg3Al2(SiO4)3
SiSilicon
Siⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Siⓘ AlmandineFe32+Al2(SiO4)3
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ PyropeMg3Al2(SiO4)3
Siⓘ QuartzSiO2
Siⓘ StauroliteFe22+Al9Si4O23(OH)
Siⓘ Almandine-Pyrope Series var. RhodoliteMg3Al2(SiO4)3
ClChlorine
Clⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
TiTitanium
Tiⓘ Amphibole SupergroupAB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Feⓘ AlmandineFe32+Al2(SiO4)3
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ StauroliteFe22+Al9Si4O23(OH)

Other Regions, Features and Areas containing this locality

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This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Jarnot, Bruce and Jarnot, Miranda. (2004) Gem Almandine from Colchester, Connecticut: in abstracts of the 31st Rochester Mineralogical Symposium, April 15-18, 2004: 13-14.
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