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:
Fletcher Mine, Groton, Grafton Co., New Hampshire, USA

Oldest recorded age at locality: 339
Youngest recorded age at locality: 319

mindat Locality ID: 6343
mindat URL: http://www.mindat.org/loc-6343.html

Tectonic Settings:

Total number of sublocalities beneath "Fletcher Mine, Groton, Grafton Co., New Hampshire, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 43°45'34"N
Longitude: 71°49'38"W
Decimal Degree (lat, lon): 43.759444444444,-71.827222222222
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 Be Ca Cu Fe H K Li Mg Mn Na O P S Si U 

Elements from minerals reported directly at this locality: Al As Be Ca Cu Fe H K Li Mg Mn Na O P S Si U 

Structural Groups for minerals in this locality: 
ArsenopyriteArthuriteAutuniteBerauniteBerylChildreniteClayFeldsparGadoliniteGarnet
GraftoniteHureauliteJahnsiteLaueiteLeucophosphiteMeta-autuniteMicaNoneNot in a structural groupOlivine
PhosphosideriteQuartzRockbridgeiteStewartiteStrunziteVivianite

38 IMA Minerals at location:
Albite  (*)Almandine  (*)Arsenopyrite  (*)Autunite  (*)Beraunite  (*)
Bermanite  (*)Bertrandite  (*)Beryl  (*)Brazilianite  (*)Eleonorite  (*)
Eosphorite  (*)Frondelite  (*)Graftonite  (*)Heterosite  (*)Hureaulite  (*)
Hydroxylherderite  (*)Jahnsite-(CaMnFe)  (*)Jahnsite-(CaMnMg)  (*)Laueite  (*)Leucophosphite  (*)
Ludlamite  (*)Meta-autunite  (*)Metatorbernite  (*)Microcline  (*)Muscovite  (*)
Paravauxite  (*)Phosphosiderite  (*)Quartz  (*)Rockbridgeite  (*)Sillimanite  (*)
Stewartite  (*)Strengite  (*)Strunzite  (*)Tavorite  (*)Torbernite  (*)
Triphylite  (*)Vivianite  (*)Xanthoxenite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Albite  (*)FeldsparNa(AlSi3O8)33931908803
Almandine  (*)GarnetFe2+3Al2(SiO4)333931902353
Arsenopyrite  (*)ArsenopyriteFeAsS33931909052
Autunite  (*)AutuniteCa(UO2)2(PO4)2·10-12H2O33931901272
Beraunite  (*)BerauniteFe3+6(PO4)4O(OH)4·6H2O3393190136
Bermanite  (*)ArthuriteMn2+Mn3+2(PO4)2(OH)2·4H2O339319055
Bertrandite  (*)Not in a structural groupBe4Si2O7(OH)23393190606
Beryl  (*)BerylBe3Al2Si6O1833931904286
Brazilianite  (*)Not in a structural groupNaAl3(PO4)2(OH)4339319059
Eleonorite  (*)BerauniteFe3+6(PO4)4O(OH)4·6H2O339319051
Eosphorite  (*)ChildreniteMn2+Al(PO4)(OH)2·H2O3393190128
Frondelite  (*)Rockbridgeite(Mn2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5339319052
Graftonite  (*)GraftoniteFe2+Fe2+2(PO4)23393190107
Heterosite  (*)OlivineFe3+(PO4)3393190204
Hureaulite  (*)HureauliteMn2+5(PO3OH)2(PO4)2·4H2O3393190125
Hydroxylherderite  (*)GadoliniteCaBe(PO4)(OH)3393190119
Jahnsite-(CaMnFe)  (*)JahnsiteCaMn2+Fe2+2Fe3+2(PO4)4(OH)2·8H2O339319027
Jahnsite-(CaMnMg)  (*)JahnsiteCaMn2+Mg2Fe3+2(PO4)4(OH)2·8H2O339319014
Laueite  (*)LaueiteMn2+Fe3+2(PO4)2(OH)2·8H2O339319070
Leucophosphite  (*)LeucophosphiteKFe3+2(PO4)2(OH)·2H2O3393190110
Ludlamite  (*)NoneFe2+3(PO4)2·4H2O339319066
Meta-autunite  (*)Meta-autuniteCa(UO2)2(PO4)2·6H2O3393190388
Metatorbernite  (*)NoneCu(UO2)2(PO4)2·8H2O3393190443
Microcline  (*)FeldsparK(AlSi3O8)33931904924
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2339319017380
Paravauxite  (*)LaueiteFe2+Al2(PO4)2(OH)2·8H2O339319019
Phosphosiderite  (*)PhosphosideriteFe3+(PO4)·2H2O3393190182
Quartz  (*)QuartzSiO2339319061156
Rockbridgeite  (*)Rockbridgeite(Fe2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)53393190206
Sillimanite  (*)Not in a structural groupAl2SiO533931901516
Stewartite  (*)StewartiteMn2+Fe3+2(PO4)2(OH)2·8H2O339319048
Strengite  (*)NoneFe3+(PO4)·2H2O3393190263
Strunzite  (*)StrunziteMn2+Fe3+2(PO4)2(OH)2·6H2O339319098
Tavorite  (*)NoneLiFe3+(PO4)(OH)339319035
Torbernite  (*)NoneCu(UO2)2(PO4)2·12H2O33931901059
Triphylite  (*)OlivineLiFe2+(PO4)3393190313
Vivianite  (*)VivianiteFe2+3(PO4)2·8H2O3393190636
Xanthoxenite  (*)NoneCa4Fe3+2(PO4)4(OH)2·3H2O339319029


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
Alexandra-0411339319329 ± 10K-ArAge of pegmatitemuscovite   Muscovite  6343Fletcher Mine, Groton, Grafton Co., New Hampshire, USAFletcherZartman et al. (1970)10.1130/0016-7606(1970)81[3359:APDOKR]2.0.CO;2GSAB81_3359 

SampleSource LocalityReference URL
R070451Fletcher Mine, Groton, Grafton Co., New Hampshire, USAhttps://rruff.info/R070451

All locality data graciously provided by mindat.org

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