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:
Middletown Lead Mines (Middletown Mine), Middletown, Middlesex Co., Connecticut, USA

Oldest recorded age at locality: 277.9
Youngest recorded age at locality: 277.9

mindat Locality ID: 23355
mindat URL: http://www.mindat.org/loc-23355.html

Tectonic Settings:

Total number of sublocalities beneath "Middletown Lead Mines (Middletown Mine), Middletown, Middlesex Co., Connecticut, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 41°33'32"N
Longitude: 72°36'42"W
Decimal Degree (lat, lon): 41.558888888889,-72.611666666667
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: Ag Al As C Ca Cd Cl Cu F Fe H O P Pb S Si Zn 

Elements from minerals reported directly at this locality: Ag Al As C Ca Cd Cl Cu F Fe H O P Pb S Si Zn 

Structural Groups for minerals in this locality: 
AcanthiteAllophaneApatiteAragoniteArsenopyriteBaryteCalciteChalcopyriteFluoriteMalachite
MarcasiteMiniumNoneNot in a structural groupPyriteQuartzRocksaltRutileSphaleriteWurtzite

24 IMA Minerals at location:
Acanthite  (*)Anglesite  (*)Arsenopyrite  (*)Aurichalcite  (*)Calcite  (*)
Cerussite  (*)Chalcopyrite  (*)Chrysocolla  (*)Fluorite  (*)Galena  (*)
Greenockite  (*)Hemimorphite  (*)Hydrozincite  (*)Litharge  (*)Malachite  (*)
Marcasite  (*)Massicot  (*)Mimetite  (*)Minium  (*)Plattnerite  (*)
Pyrite  (*)Pyromorphite  (*)Quartz  (*)Sphalerite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Acanthite  (*)AcanthiteAg2S277.9277.902793
Anglesite  (*)BarytePb(SO4)277.9277.902734
Arsenopyrite  (*)ArsenopyriteFeAsS277.9277.909052
Aurichalcite  (*)None(Zn,Cu)5(CO3)2(OH)6277.9277.90919
Calcite  (*)CalciteCa(CO3)277.9277.9027770
Cerussite  (*)AragonitePb(CO3)277.9277.904979
Chalcopyrite  (*)ChalcopyriteCuFeS2277.9277.9027198
Chrysocolla  (*)Allophane(Cu2-xAlx)H2-xSi2O5(OH)4·nH2O277.9277.903531
Fluorite  (*)FluoriteCaF2277.9277.909617
Galena  (*)RocksaltPbS277.9277.9024243
Greenockite  (*)WurtziteCdS277.9277.90717
Hemimorphite  (*)Not in a structural groupZn4(Si2O7)(OH)2·H2O277.9277.901689
Hydrozincite  (*)NoneZn5(CO3)2(OH)6277.9277.901066
Litharge  (*)NonePbO277.9277.90139
Malachite  (*)MalachiteCu2(CO3)(OH)2277.9277.9012537
Marcasite  (*)MarcasiteFeS2277.9277.905674
Massicot  (*)NonePbO277.9277.90202
Mimetite  (*)ApatitePb5(AsO4)3Cl277.9277.901107
Minium  (*)MiniumPb2+2Pb4+O4277.9277.90247
Plattnerite  (*)RutilePbO2277.9277.90158
Pyrite  (*)PyriteFeS2277.9277.9039462
Pyromorphite  (*)ApatitePb5(PO4)3Cl277.9277.901725
Quartz  (*)QuartzSiO2277.9277.9061156
Sphalerite  (*)SphaleriteZnS277.9277.9021482


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
Mo-00159277.9277.9277.9U-Pb monazite  YesMolybdeniteMo17878Middletown, Middlesex Co., Connecticut, USAMiddletownFenner (1932)10.2475/ajs.s5-23.136.327AJS5_327 

SampleSource LocalityReference URL

All locality data graciously provided by mindat.org

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