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:
Worcester, Worcester Co., Massachusetts, USA

Oldest recorded age at locality: 379
Youngest recorded age at locality: 342.14

mindat Locality ID: 22367
mindat URL: http://www.mindat.org/loc-22367.html

Tectonic Settings:

Total number of sublocalities beneath "Worcester, Worcester Co., Massachusetts, USA": 7
Total number of bottom-level sublocalities: 7

Number of Child Localities: 7
Child Localities:
Ballard Quarry
Millstone Hill Quarry
Soapstone Locality
Tatnuck Hill Quarry
Worcester Coal Mine
Worcester Silver Mine (Northville Silver Mine; Old Silver Mine)
Worcester Vesuvianite Locality

Latitude: 42°16'30"N
Longitude: 71°49'40"W
Decimal Degree (lat, lon): 42.275,-71.827777777778
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 B Be C Ca Cu F Fe H Mg Mo Na O Pb S Si Ti Zn Zr 

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

Structural Groups for minerals in this locality: 
AmphiboleArsenopyriteBerylCalciteChalcopyriteChloriteClayClinozoisiteEpidoteFluorite
GarnetMalachiteMolybdeniteNickelineNoneNot in a structural groupPrehnitePyritePyroxeneQuartz
RocksaltSmectite-vermiculiteSphaleriteStauroliteTitaniteTourmalineVesuvianiteZircon

31 IMA Minerals at location:
Actinolite  (*)Almandine  (*)Ankerite  (*)Arsenopyrite  (*)Azurite  (*)
Beryl  (*)Calcite  (*)Chalcopyrite  (*)Clinochlore  (*)Clinozoisite  (*)
Diopside  (*)Epidote  (*)Fluorite  (*)Galena  (*)Graphite  (*)
Grossular  (*)Malachite  (*)Molybdenite  (*)Prehnite  (*)Pyrite  (*)
Pyrrhotite  (*)Quartz  (*)Schorl  (*)Siderite  (*)Sillimanite  (*)
Sphalerite  (*)Staurolite  (*)Titanite  (*)Vermiculite  (*)Vesuvianite  (*)
Zircon  (*)
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)212199343419
Almandine  (*)GarnetFe2+3Al2(SiO4)312199382353
Ankerite  (*)NoneCa(Fe2+,Mg)(CO3)2379342.1412199353092
Arsenopyrite  (*)ArsenopyriteFeAsS12199399052
Azurite  (*)Not in a structural groupCu3(CO3)2(OH)212199345509
Beryl  (*)BerylBe3Al2Si6O18379342.1412199354286
Calcite  (*)CalciteCa(CO3)379342.143219934,219935,21994027770
Chalcopyrite  (*)ChalcopyriteCuFeS2121993427198
Clinochlore  (*)Chlorite ClayMg5Al(AlSi3O10)(OH)812199341756
Clinozoisite  (*)Clinozoisite EpidoteCa2Al3[Si2O7][SiO4]O(OH)12199401025
Diopside  (*)PyroxeneCaMgSi2O612199404135
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)12199348173
Fluorite  (*)FluoriteCaF2379342.1412199359617
Galena  (*)RocksaltPbS121993924243
Graphite  (*)NoneC12199382812
Grossular  (*)GarnetCa3Al2(SiO4)3379342.142219935,2199401544
Malachite  (*)MalachiteCu2(CO3)(OH)2121993412537
Molybdenite  (*)MolybdeniteMoS2379342.1412199355800
Prehnite  (*)PrehniteCa2Al(Si3Al)O10(OH)212199341898
Pyrite  (*)PyriteFeS2379342.144219934,219935,219937,21993939462
Pyrrhotite  (*)NickelineFe7S812199349056
Quartz  (*)QuartzSiO2379342.142219934,21993561156
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)12199372705
Siderite  (*)CalciteFe(CO3)12199396417
Sillimanite  (*)Not in a structural groupAl2SiO5379342.1401516
Sphalerite  (*)SphaleriteZnS379342.14121993521482
Staurolite  (*)StauroliteFe2+2Al9Si4O23(OH)379342.140978
Titanite  (*)TitaniteCaTi(SiO4)O379342.1412199354899
Vermiculite  (*)Clay Smectite-vermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4·8H2O1219934652
Vesuvianite  (*)Vesuvianite(Ca,Na)19(Al,Mg,Fe)13(SiO4)10(Si2O7)4(OH,F,O)1012199401395
Zircon  (*)ZirconZr(SiO4)12199345251


5 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
USGS-Rb-Sr-00877372.14342.14357.14±15Rb-Srage of intrusionwhole rock     15191Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-06279379365372±7Rb-Srage of intrusionwhole rock     15191Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-06280379365372±7Rb-Srage of intrusionwhole rock     15191Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-06281379365372±7Rb-Srage of intrusionwhole rock     15191Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-06282379365372±7Rb-Srage of intrusionwhole rock     15191Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 

SampleSource LocalityReference URL

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