Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org



The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.


Locality Name:
Great Hill Cobalt Mines, Cobalt, East Hampton (Chatham), Middlesex Co., Connecticut, USA

Oldest recorded age at locality: 274
Youngest recorded age at locality: 272

mindat Locality ID: 17109
mindat URL: http://www.mindat.org/loc-17109.html

Tectonic Settings:

Total number of sublocalities beneath "Great Hill Cobalt Mines, Cobalt, East Hampton (Chatham), Middlesex Co., Connecticut, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 41°34'40"N
Longitude: 72°32'59"W
Decimal Degree (lat, lon): 41.577777777778,-72.549722222222
AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
This mineral's age has not yet been recorded.

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Al As Au Ca Co Cu Fe H K Mg Na Ni O Pb S Si Zn 

Elements from minerals reported directly at this locality: Al As Au Ca Co Cu Fe H K Mg Na Ni O Pb S Si Zn 

Structural Groups for minerals in this locality: 
AmorphousAmphiboleArsenopyriteChalcopyriteClayCopperDiasporeFeldsparGarnetHalotrichite
KaoliniteLöllingiteMelanteriteMicaNickelineNonePyriteQuartzRocksaltSphalerite
SpinelStauroliteVivianite

28 IMA Minerals at location:
Actinolite  (*)Albite  (*)Almandine  (*)Annabergite  (*)Anorthite  (*)
Arsenopyrite  (*)Chalcopyrite  (*)Erythrite  (*)Gahnite  (*)Galena  (*)
Goethite  (*)Gold  (*)Grossular  (*)Kaolinite  (*)Löllingite  (*)
Melanterite  (*)Microcline  (*)Muscovite  (*)Nickeline  (*)Opal  (*)
Gersdorffite-Pa3  (*)Pickeringite  (*)Pyrite  (*)Pyrrhotite  (*)Quartz  (*)
Scorodite  (*)Sphalerite  (*)Staurolite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Actinolite  (*)Amphibole   Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)227427203419
Albite  (*)FeldsparNa(AlSi3O8)27427208803
Almandine  (*)GarnetFe2+3Al2(SiO4)327427202353
Annabergite  (*)VivianiteNi3(AsO4)2·8H2O2742720445
Anorthite  (*)FeldsparCa(Al2Si2O8)27427201036
Arsenopyrite  (*)ArsenopyriteFeAsS27427209052
Chalcopyrite  (*)ChalcopyriteCuFeS2274272027198
Erythrite  (*)VivianiteCo3(AsO4)2·8H2O2742720814
Gahnite  (*)SpinelZnAl2O42742720445
Galena  (*)RocksaltPbS274272024243
Goethite  (*)DiasporeFeO(OH)27427207437
Gold  (*)CopperAu274272030554
Grossular  (*)GarnetCa3Al2(SiO4)327427201544
Kaolinite  (*)Clay KaoliniteAl2Si2O5(OH)427427205591
Löllingite  (*)LöllingiteFeAs22742720762
Melanterite  (*)MelanteriteFe(SO4)·7H2O2742720915
Microcline  (*)FeldsparK(AlSi3O8)27427204924
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2274272017380
Nickeline  (*)NickelineNiAs2742720633
Opal  (*)AmorphousSiO2·nH2O27427202994
Gersdorffite-Pa3  (*)PyriteNiAsS2742720767
Pickeringite  (*)HalotrichiteMgAl2(SO4)4·22H2O2742720265
Pyrite  (*)PyriteFeS2274272039462
Pyrrhotite  (*)NickelineFe7S827427209056
Quartz  (*)QuartzSiO2274272061156
Scorodite  (*)NoneFe3+(AsO4)·2H2O27427201153
Sphalerite  (*)SphaleriteZnS274272021482
Staurolite  (*)StauroliteFe2+2Al9Si4O23(OH)2742720978


1 Ages assigned to this locality:

Excel IDMax Age (Ma)Min Age (Ma)Age as listed in referenceDating MethodAge InterpretPrioritized?Sample SourceSample NumRun NumAge from other LocalityDated MineralMinerals explicitely stated as having this ageAge applies to these ElementsMinDat Locality IDDated Locality (Max Age)Location as listed in referenceReferenceReference DOIReference IDAge Notes
Bradley_2012_069274272273±1U/Pb zircon  YesZircon  6782Anderson No. 1 Mica Mine (Swanson Mine; Swanson Lithia Mine), East Hampton (Chatham), Middlesex Co., Connecticut, USAAndersonMcCauley and Bradley (2014)10.3749/canmin.52.2.183CM52_183 

SampleSource LocalityReference URL

All locality data graciously provided by mindat.org

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