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:
Walden Gem Quarry, Portland, Middlesex Co., Connecticut, USA


mindat Locality ID: 6749
mindat URL: http://www.mindat.org/loc-6749.html

Tectonic Settings:

Total number of sublocalities beneath "Walden Gem Quarry, Portland, Middlesex Co., Connecticut, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 41°37'8"N
Longitude: 72°35'45"W
Decimal Degree (lat, lon): 41.618888888889,-72.595833333333
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 B Be Ca Cs F Fe H K Li Mg Mn Na Nb O P S Si Sn Ta U Zr 

Elements from minerals reported directly at this locality: Al B Be Ca Cs F Fe H K Li Mg Mn Na Nb O P S Si Sn Ta U Zr 

Structural Groups for minerals in this locality: 
AmorphousAnalcimeApatiteAutuniteBerylClayColumbiteFeldsparFluoriteGarnet
GypsumMeta-autuniteMicaNonePyroxeneQuartzRutileSmectite-vermiculiteSulphurTopaz
TourmalineZircon

28 IMA Minerals at location:
Albite  (*)Almandine  (*)Annite  (*)Autunite  (*)Beryl  (*)
Cassiterite  (*)Columbite-(Fe)  (*)Elbaite  (*)Fluorapatite  (*)Gypsum  (*)
Meta-autunite  (*)Microcline  (*)Montebrasite  (*)Montmorillonite  (*)Muscovite  (*)
Opal  (*)Pollucite  (*)Quartz  (*)Schorl  (*)Spessartine  (*)
Spodumene  (*)Sulphur  (*)Tantalite-(Mn)  (*)Topaz  (*)Uraninite  (*)
Uranophane-α  (*)Wodginite  (*)Zircon  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Albite  (*)FeldsparNa(AlSi3O8)08803
Almandine  (*)GarnetFe2+3Al2(SiO4)302353
Annite  (*)Mica ClayKFe2+3(AlSi3O10)(OH)20356
Autunite  (*)AutuniteCa(UO2)2(PO4)2·10-12H2O01272
Beryl  (*)BerylBe3Al2Si6O1804286
Cassiterite  (*)RutileSnO205171
Columbite-(Fe)  (*)ColumbiteFe2+Nb2O60518
Elbaite  (*)TourmalineNa(Al1.5Li1.5)Al6(Si6O18)(BO3)3(OH)3(OH)0520
Fluorapatite  (*)ApatiteCa5(PO4)3F02740
Gypsum  (*)GypsumCa(SO4)·2H2O06890
Meta-autunite  (*)Meta-autuniteCa(UO2)2(PO4)2·6H2O0388
Microcline  (*)FeldsparK(AlSi3O8)04924
Montebrasite  (*)NoneLiAl(PO4)(OH)0200
Montmorillonite  (*)Clay Smectite-vermiculite(Na,Ca)0.3(Al,Mg)2Si4O10(OH)2·nH2O01508
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2017380
Opal  (*)AmorphousSiO2·nH2O02994
Pollucite  (*)AnalcimeCs(Si2Al)O6·nH2O0140
Quartz  (*)QuartzSiO2061156
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)02705
Spessartine  (*)GarnetMn2+3Al2(SiO4)301214
Spodumene  (*)PyroxeneLiAlSi2O60688
Sulphur  (*)SulphurS02045
Tantalite-(Mn)  (*)ColumbiteMn2+Ta2O60211
Topaz  (*)TopazAl2SiO4F201476
Uraninite  (*)FluoriteUO202718
Uranophane-α  (*)NoneCa(UO2)2(SiO3OH)2·5H2O0890
Wodginite  (*)ColumbiteMn2+Sn4+Ta2O8078
Zircon  (*)ZirconZr(SiO4)05251


No ages have been assigned to this locality yet.
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All locality data graciously provided by mindat.org

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