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:
Harpswell, Cumberland Co., Maine, USA

Oldest recorded age at locality: 265
Youngest recorded age at locality: 263

mindat Locality ID: 105705
mindat URL: http://www.mindat.org/loc-105705.html

Tectonic Settings:

Total number of sublocalities beneath "Harpswell, Cumberland Co., Maine, USA": 5
Total number of bottom-level sublocalities: 4

Number of Child Localities: 4
Child Localities:
Bombazine Island
Dyer Cove
Jaquish Island
Sebascodegan Island

Latitude: 0°0'0"N
Longitude: 0°0'0"E
Decimal Degree (lat, lon): 0,0
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 C Ca Fe H K Mg Mn Na O Si Ti 

Elements from minerals reported directly at this locality: Al Ca Fe H Mg Mn O Si 

Structural Groups for minerals in this locality: 
AmphiboleAndalusiteBerylChloriteClayCorundumFeldsparGarnetMicaNone
Not in a structural groupQuartzScapoliteSpinelStauroliteTalcTitanite

25 IMA Minerals at location:
Actinolite  (*)Albite  (*)Almandine  (*)Andalusite  (*)Annite  (*)
Anthophyllite  (*)Clinochlore  (*)Cordierite  (*)Corundum  (*)Cummingtonite  (*)
Gedrite  (*)Grossular  (*)Magnesio-hornblende  (*)Margarite  (*)Meionite  (*)
Muscovite  (*)Phlogopite  (*)Quartz  (*)Sillimanite  (*)Spessartine  (*)
Spinel  (*)Staurolite  (*)Talc  (*)Titanite  (*)Tremolite  (*)
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)226526303419
Albite  (*)FeldsparNa(AlSi3O8)2652632216849,2168538803
Almandine  (*)GarnetFe2+3Al2(SiO4)326526312168492353
Andalusite  (*)AndalusiteAl2SiO526526301310
Annite  (*)Mica ClayKFe2+3(AlSi3O10)(OH)22652631216849356
Anthophyllite  (*)Amphibole   Mg2Mg5Si8O22(OH)22652630718
Clinochlore  (*)Chlorite ClayMg5Al(AlSi3O10)(OH)826526312168491756
Cordierite  (*)BerylMg2Al4Si5O1826526312168491008
Corundum  (*)CorundumAl2O326526301797
Cummingtonite  (*)Amphibole   Mg2Mg5Si8O22(OH)22652633216849,216850,216853327
Gedrite  (*)Amphibole   Mg2(Mg3Al2)(Si6Al2)O22(OH)22652632216849,216850178
Grossular  (*)GarnetCa3Al2(SiO4)326526312168491544
Magnesio-hornblende  (*)Amphibole   Ca2(Mg4Al)(Si7Al)O22(OH)22652631216849238
Margarite  (*)Mica ClayCaAl2Si2Al2O10(OH)22652631216849168
Meionite  (*)ScapoliteCa4Al6Si6O24(CO3)2652631216849176
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)22652632216849,21685317380
Phlogopite  (*)Mica ClayKMg3(AlSi3O10)(OH)226526312168492273
Quartz  (*)QuartzSiO22652632216849,21685361156
Sillimanite  (*)Not in a structural groupAl2SiO52652632216849,2168531516
Spessartine  (*)GarnetMn2+3Al2(SiO4)326526301214
Spinel  (*)SpinelMgAl2O426526312168491934
Staurolite  (*)StauroliteFe2+2Al9Si4O23(OH)2652631216849978
Talc  (*)Clay TalcMg3Si4O10(OH)226526312168523337
Titanite  (*)TitaniteCaTi(SiO4)O26526312168494899
Tremolite  (*)Amphibole   Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)226526312168522562


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_092265263264±1U/Pb zircon  YesZircon  237377Sebago, Cumberland Co., Maine, USAMt. Mica (Irish Pit)McCauley 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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