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:
West Chester, Westtown Township, Chester Co., Pennsylvania, USA


mindat Locality ID: 4097
mindat URL: http://www.mindat.org/loc-4097.html

Tectonic Settings:

Total number of sublocalities beneath "West Chester, Westtown Township, Chester Co., Pennsylvania, USA": 1
Total number of bottom-level sublocalities: 1

Number of Child Localities: 1
Child Localities:
Brinton's Quarry

Latitude: 39°55'49"N
Longitude: 75°33'9"W
Decimal Degree (lat, lon): 39.930277777778,-75.5525
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 C Ca Fe H Mg Na O Si Ti 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AmphiboleAragoniteBerylBruciteChloriteClayCorundumNoneOlivineQuartz
Smectite-vermiculiteSpinelTalcTourmaline

13 IMA Minerals at location:
Aragonite  (*)Beryl  (*)Brucite  (*)Clinochlore  (*)Forsterite  (*)
Hydromagnesite  (*)Ilmenite  (*)Magnetite  (*)Quartz  (*)Schorl  (*)
Talc  (*)Tremolite  (*)Vermiculite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Aragonite  (*)AragoniteCa(CO3)12627683250
Beryl  (*)BerylBe3Al2Si6O1812627684286
Brucite  (*)BruciteMg(OH)21262768462
Clinochlore  (*)Chlorite ClayMg5Al(AlSi3O10)(OH)812627681756
Forsterite  (*)OlivineMg2(SiO4)12627681188
Hydromagnesite  (*)NoneMg5(CO3)4(OH)2·4H2O1262768341
Ilmenite  (*)CorundumFe2+Ti4+O312627685433
Magnetite  (*)SpinelFe2+Fe3+2O4126276814899
Quartz  (*)QuartzSiO2126276861156
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)12627682705
Talc  (*)Clay TalcMg3Si4O10(OH)212627683337
Tremolite  (*)Amphibole   Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)212627682562
Vermiculite  (*)Clay Smectite-vermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4·8H2O1262768652


No ages have been assigned to this locality yet.
SampleSource LocalityReference URL
R040144Brinton's Quarry, West Chester, Westtown Township, Chester Co., Pennsylvania, USAhttps://rruff.info/R040144

All locality data graciously provided by mindat.org

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