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:
Middlesex Co., Massachusetts, USA

Oldest recorded age at locality: 641
Youngest recorded age at locality: 275

mindat Locality ID: 15759
mindat URL: http://www.mindat.org/loc-15759.html

Tectonic Settings:

Total number of sublocalities beneath "Middlesex Co., Massachusetts, USA": 118
Total number of bottom-level sublocalities: 85

Number of Child Localities: 39
Child Localities:
Acton
Ashland
Ayer
Bedford
Belmont
Billerica
Boxborough
Burlington
Cambridge
Carlisle
Chelmsford
Concord
Dracut
Dunstable
Framingham
Groton
Holliston
Hopkinton
Hudson
Lexington
Littleton
Lowell
Malden
Marlborough
Medford
Newton
Pepperell
Reading
Somerville
Stoneham
Stow
Townsend
Waltham
Wayland
Westford
Weston
Wilmington
Winchester
Woburn

Latitude: 42°29'3"N
Longitude: 71°20'32"W
Decimal Degree (lat, lon): 42.484166666667,-71.342222222222
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 Ba Be C Ca Ce Co Cu F Fe H K Mg Mn Mo Na Ni O P Pb S Si Th Ti U W Y Zn Zr 

Elements from minerals reported directly at this locality: As Co S 

Structural Groups for minerals in this locality: 
AllaniteAllophaneAmorphousAmphiboleAnalcimeAndalusiteApatiteAragoniteArsenopyriteAutunite
AxiniteBaryteBerylBrookiteBruciteCalciteChabaziteChalcopyriteChloriteClay
ClinozoisiteCobaltiteCopperCorundumDiasporeEpidoteFeldsparFluoriteGarnetGypsum
HalotrichiteHumiteKaoliniteMalachiteMarcasiteMelanteriteMicaMilleriteMolybdeniteMonazite
NatroliteNickelineNoneNot in a structural groupOlivinePentlanditePrehnitePyritePyroxeneQuartz
RhodoniteRocksaltRutileScapoliteScheeliteSerpentineSmectite-vermiculiteSphaleriteSpinelStilbite
StilpnomelaneTalcTitaniteTourmalineTridymiteVesuvianiteWollastoniteZircon

109 IMA Minerals at location:
Actinolite  (*)Aegirine  (*)Albite  (*)Allanite-(Ce)  (*)Almandine  (*)
Analcime  (*)Anatase  (*)Andalusite  (*)Andradite  (*)Anhydrite  (*)
Anorthite  (*)Antigorite  (*)Aragonite  (*)Arsenopyrite  (*)Augite  (*)
Aurichalcite  (*)Autunite  (*)Axinite-(Fe)  (*)Azurite  (*)Babingtonite  (*)
Baryte  (*)Beryl  (*)Bornite  (*)Brookite  (*)Brucite  (*)
Calcite  (*)Chabazite-Ca  (*)Chabazite-K  (*)Chalcocite  (*)Chalcopyrite  (*)
Chamosite  (*)Chondrodite  (*)Chrysocolla  (*)Chrysotile  (*)Clinochlore  (*)
Clinozoisite  (*)Cobaltite  (*)Copper  (*)Cordierite  (*)Cuprite  (*)
Diopside  (*)Dolomite  (*)Epidote  (*)Ferro-hornblende  (*)Fluorapatite  (*)
Fluorite  (*)Forsterite  (*)Galena  (*)Geikielite  (*)Goethite  (*)
Graphite  (*)Grossular  (*)Gypsum  (*)Hematite  (*)Ilmenite  (*)
Kaersutite  (*)Kamphaugite-(Y)  (*)Kaolinite  (*)Kyanite  (*)Laumontite  (*)
Magnesite  (*)Magnetite  (*)Malachite  (*)Marcasite  (*)Meionite  (*)
Melanterite  (*)Microcline  (*)Millerite  (*)Molybdenite  (*)Monazite-(Ce)  (*)
Montmorillonite  (*)Muscovite  (*)Natrolite  (*)Nepheline  (*)Opal  (*)
Orthoclase  (*)Pargasite  (*)Pentlandite  (*)Phlogopite  (*)Pickeringite  (*)
Piemontite  (*)Polydymite  (*)Prehnite  (*)Pyrite  (*)Pyrolusite  (*)
Pyrrhotite  (*)Quartz  (*)Rutile  (*)Saponite  (*)Scheelite  (*)
Schorl  (*)Siderite  (*)Sillimanite  (*)Spessartine  (*)Sphalerite  (*)
Spinel  (*)Stellerite  (*)Stilbite-Ca  (*)Stilpnomelane  (*)Talc  (*)
Thorite  (*)Titanite  (*)Tremolite  (*)Uraninite  (*)Vesuvianite  (*)
Violarite  (*)Wollastonite  (*)Xenotime-(Y)  (*)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)210219572,219579,219587,219589,219590,219624,219626,219636,219681,2196843419
Aegirine  (*)PyroxeneNaFe3+Si2O612196471022
Albite  (*)FeldsparNa(AlSi3O8)15219569,219572,219586,219607,219623,219624,219631,219639,219642,219643,219645,219647,219649,219661,2196828803
Allanite-(Ce)  (*)Allanite EpidoteCaCe(Al2Fe2+)[Si2O7][SiO4]O(OH)2219624,219682706
Almandine  (*)GarnetFe2+3Al2(SiO4)34219589,219596,219624,2196262353
Analcime  (*)AnalcimeNa(AlSi2O6)·H2O12196821627
Anatase  (*)Not in a structural groupTiO26219594,219616,219639,219641,219642,2196432162
Andalusite  (*)AndalusiteAl2SiO52219653,2196561310
Andradite  (*)GarnetCa3Fe3+2(SiO4)312196821534
Anhydrite  (*)Not in a structural groupCa(SO4)2219624,2196311588
Anorthite  (*)FeldsparCa(Al2Si2O8)2219586,2196391036
Antigorite  (*)Serpentine ClayMg3Si2O5(OH)43052751219646708
Aragonite  (*)AragoniteCa(CO3)12196523250
Arsenopyrite  (*)ArsenopyriteFeAsS2219616,2196829052
Augite  (*)Pyroxene(Ca,Mg,Fe)2Si2O65219586,219599,219639,219640,2196472060
Aurichalcite  (*)None(Zn,Cu)5(CO3)2(OH)61219572919
Autunite  (*)AutuniteCa(UO2)2(PO4)2·10-12H2O2219622,2196241272
Axinite-(Fe)  (*)AxiniteCa4Fe2+2Al4[B2Si8O30](OH)21219572260
Azurite  (*)Not in a structural groupCu3(CO3)2(OH)212196825509
Babingtonite  (*)RhodoniteCa2Fe2+Fe3+Si5O14(OH)8219572,219637,219638,219640,219641,219680,219682,219684161
Baryte  (*)BaryteBa(SO4)3219607,219631,21965111547
Beryl  (*)BerylBe3Al2Si6O183219568,219611,2196774286
Bornite  (*)NoneCu5FeS43219572,219611,2196825516
Brookite  (*)BrookiteTiO24219590,219641,219642,219643700
Brucite  (*)BruciteMg(OH)21219589462
Calcite  (*)CalciteCa(CO3)30527529219572,219578,219579,219586,219587,219590,219593,219594,219596,219607,219611,219616,219618,219622,219624,219626,219631,219633,219636,219639,219640,219642,219643,219645,219646,219652,219674,219682,21968327770
Chabazite-Ca  (*)ChabaziteCa2[Al4Si8O24]·13H2O2219624,219626310
Chabazite-K  (*)Chabazite(K2NaCa0.5)[Al4Si8O24]·11H2O121962430
Chalcocite  (*)NoneCu2S2219588,2196825707
Chalcopyrite  (*)ChalcopyriteCuFeS230527515219572,219590,219592,219595,219599,219600,219607,219611,219616,219626,219642,219646,219682,219683,21968427198
Chamosite  (*)Chlorite Clay(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)81219572577
Chondrodite  (*)HumiteMg5(SiO4)2F21219589285
Chrysocolla  (*)Allophane(Cu2-xAlx)H2-xSi2O5(OH)4·nH2O4219572,219587,219611,2196163531
Chrysotile  (*)Serpentine ClayMg3Si2O5(OH)41219599951
Clinochlore  (*)Chlorite ClayMg5Al(AlSi3O10)(OH)84219585,219593,219639,2196401756
Clinozoisite  (*)Clinozoisite EpidoteCa2Al3[Si2O7][SiO4]O(OH)6219568,219572,219587,219596,219618,2196261025
Cobaltite  (*)CobaltiteCoAsS6412750966
Copper  (*)CopperCu3219588,219624,2196313846
Cordierite  (*)BerylMg2Al4Si5O1812196251008
Cuprite  (*)Not in a structural groupCu2O2219631,2196822970
Diopside  (*)PyroxeneCaMgSi2O69219568,219587,219590,219592,219596,219617,219618,219626,2196474135
Dolomite  (*)NoneCaMg(CO3)27219578,219587,219590,219599,219611,219618,2196249895
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)46027527219569,219570,219572,219584,219596,219605,219607,219611,219613,219616,219623,219626,219627,219631,219636,219638,219639,219640,219646,219653,219661,219667,219669,219674,219681,219682,2196848173
Ferro-hornblende  (*)Amphibole   Ca2(Fe2+4Al)(Si7Al)O22(OH)22219572,219647271
Fluorapatite  (*)ApatiteCa5(PO4)3F7219572,219575,219589,219590,219596,219622,2196242740
Fluorite  (*)FluoriteCaF23052756219590,219596,219607,219646,219682,2196839617
Forsterite  (*)OlivineMg2(SiO4)2219578,2195901188
Galena  (*)RocksaltPbS7219600,219616,219618,219621,219631,219651,21968324243
Geikielite  (*)CorundumMgTiO3121959070
Goethite  (*)DiasporeFeO(OH)3219572,219624,2196267437
Graphite  (*)NoneC3219618,219639,2196502812
Grossular  (*)GarnetCa3Al2(SiO4)37219579,219587,219589,219596,219613,219626,2196811544
Gypsum  (*)GypsumCa(SO4)·2H2O12196246890
Hematite  (*)CorundumFe2O38219572,219607,219621,219624,219631,219633,219674,21968214640
Ilmenite  (*)CorundumFe2+Ti4+O39219572,219595,219607,219611,219624,219631,219639,219674,2196825433
Kaersutite  (*)AmphiboleNaCa2(Mg3AlTi4+)(Si6Al2)O22O21219586179
Kamphaugite-(Y)  (*)NoneCaY(CO3)2(OH)·H2O121957228
Kaolinite  (*)Clay KaoliniteAl2Si2O5(OH)412195695591
Kyanite  (*)Not in a structural groupAl2OSiO412196481507
Laumontite  (*)Not in a structural groupCaAl2Si4O12·4H2O4219572,219639,219640,2196821271
Magnesite  (*)CalciteMg(CO3)2219589,2195901487
Magnetite  (*)SpinelFe2+Fe3+2O4427.32285.3216219569,219570,219572,219586,219595,219607,219611,219624,219631,219639,219640,219647,219648,219649,219669,21968214899
Malachite  (*)MalachiteCu2(CO3)(OH)29219569,219572,219611,219616,219626,219631,219639,219682,21968412537
Marcasite  (*)MarcasiteFeS23219595,219618,2196245674
Meionite  (*)ScapoliteCa4Al6Si6O24(CO3)1219624176
Melanterite  (*)MelanteriteFe(SO4)·7H2O1219591915
Microcline  (*)FeldsparK(AlSi3O8)11219569,219572,219596,219607,219611,219616,219623,219639,219648,219649,2196824924
Millerite  (*)MilleriteNiS12196161066
Molybdenite  (*)MolybdeniteMoS23219607,219624,2196825800
Monazite-(Ce)  (*)MonaziteCe(PO4)427.32285.324219573,219590,219624,219653945
Montmorillonite  (*)Clay Smectite-vermiculite(Na,Ca)0.3(Al,Mg)2Si4O10(OH)2·nH2O12195721508
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2427.32285.3217219569,219570,219572,219575,219596,219605,219607,219611,219616,219618,219623,219625,219643,219648,219661,219667,21968217380
Natrolite  (*)NatroliteNa2(Si3Al2)O10·2H2O2219572,2196241236
Nepheline  (*)TridymiteNa3K(Al4Si4O16)1219647884
Opal  (*)AmorphousSiO2·nH2O9219572,219596,219607,219611,219621,219626,219651,219674,2196822994
Orthoclase  (*)FeldsparK(AlSi3O8)2219572,2196822349
Pargasite  (*)AmphiboleNaCa2(Mg4Al)(Si6Al2)O22(OH)22219578,219590313
Pentlandite  (*)Pentlandite(Ni,Fe)9S812195951512
Phlogopite  (*)Mica ClayKMg3(AlSi3O10)(OH)22219578,2195902273
Pickeringite  (*)HalotrichiteMgAl2(SO4)4·22H2O1219572265
Piemontite  (*)EpidoteCa2(Al2Mn3+)[Si2O7][SiO4]O(OH)1219631260
Polydymite  (*)SpinelNi2+Ni3+2S41219595131
Prehnite  (*)PrehniteCa2Al(Si3Al)O10(OH)246046015219572,219576,219584,219593,219594,219596,219624,219631,219637,219639,219640,219642,219651,219674,2196821898
Pyrite  (*)PyriteFeS220219572,219590,219596,219599,219607,219616,219618,219622,219624,219626,219631,219639,219643,219645,219647,219649,219674,219682,219683,21968439462
Pyrolusite  (*)RutileMnO22219600,2196073106
Pyrrhotite  (*)NickelineFe7S83219572,219590,2195959056
Quartz  (*)QuartzSiO2427.32285.3238219568,219569,219570,219572,219575,219589,219590,219593,219594,219596,219599,219605,219607,219611,219612,219616,219617,219618,219623,219624,219626,219631,219633,219636,219639,219640,219641,219642,219643,219649,219652,219660,219661,219669,219674,219682,219683,21968461156
Rutile  (*)RutileTiO2427.32285.3214219569,219573,219590,219607,219611,219616,219623,219624,219631,219641,219642,219661,219667,2196825614
Saponite  (*)Clay Smectite-vermiculite(Ca,Na)0.3(Mg,Fe)3(Si,Al)4O10(OH)2·4H2O1219586301
Scheelite  (*)ScheeliteCa(WO4)3219590,219596,2196114894
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)4219596,219624,219660,2196612705
Siderite  (*)CalciteFe(CO3)4219622,219631,219652,2196746417
Sillimanite  (*)Not in a structural groupAl2SiO52219618,2196801516
Spessartine  (*)GarnetMn2+3Al2(SiO4)312196241214
Sphalerite  (*)SphaleriteZnS5219572,219616,219642,219682,21968321482
Spinel  (*)SpinelMgAl2O46219568,219578,219589,219590,219617,2196181934
Stellerite  (*)StilbiteCa4(Si28Al8)O72·28H2O1219572189
Stilbite-Ca  (*)StilbiteNaCa4(Si27Al9)O72·28H2O1219684268
Stilpnomelane  (*)Stilpnomelane Clay(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36·nH2O3219639,219640,219682456
Talc  (*)Clay TalcMg3Si4O10(OH)23219593,219603,2196313337
Thorite  (*)ZirconTh(SiO4)12196821006
Titanite  (*)TitaniteCaTi(SiO4)O17219572,219578,219587,219590,219596,219607,219611,219616,219617,219618,219623,219624,219626,219636,219642,219682,2196844899
Tremolite  (*)Amphibole   Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)24604605219572,219584,219590,219624,2196822562
Uraninite  (*)FluoriteUO212196112718
Vesuvianite  (*)Vesuvianite(Ca,Na)19(Al,Mg,Fe)13(SiO4)10(Si2O7)4(OH,F,O)1012196261395
Violarite  (*)SpinelFeNi2S41219595380
Wollastonite  (*)WollastoniteCaSiO330527512196461247
Xenotime-(Y)  (*)ZirconY(PO4)427.32285.322219624,219653939
Zircon  (*)ZirconZr(SiO4)7219569,219570,219573,219590,219643,219649,2196825251


20 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-0113746046046Rb-Srage of intrusionwhole rock     195966Burlington, Middlesex Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-06235641541591±50Rb-Sr whole rock     212086Fletcher Quarry (Milford Pink Quarry), Hopkinton, Middlesex Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-U-Th-Pb-01334_206_238531521526±5206_238 zircon   Zircon  212086Fletcher Quarry (Milford Pink Quarry), Hopkinton, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01334_207_206624614619±5207_206 zircon   Zircon  212086Fletcher Quarry (Milford Pink Quarry), Hopkinton, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01334_207_235550538544±6207_235 zircon   Zircon  212086Fletcher Quarry (Milford Pink Quarry), Hopkinton, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
Alexandra-0416305275290 ± 15K-ArAge of basaltwhole rock     22413Stoneham, Middlesex Co., Massachusetts, USAStonehamZartman et al. (1970)10.1130/0016-7606(1970)81[3359:APDOKR]2.0.CO;2GSAB81_3359 
USGS-Rb-Sr-03298427.32285.32356.32±71Rb-Srage of intrusionwhole rock     220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-03299427.32285.32356.32±71Rb-Srage of intrusionwhole rock     220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-U-Th-Pb-01362_206_238360352356±4206_238 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01362_207_206391385388±3207_206 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01362_207_235364356360±4207_235 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01363_206_238368360364±4206_238 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01363_207_206391385388±3207_206 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01363_207_235371363367±4207_235 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01364_206_238361353357±4206_238 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01364_207_206395387391±4207_206 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01364_207_235366358362±4207_235 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01365_206_238354346350±4206_238 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01365_207_206394386390±4207_206 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-01365_207_235360352356±4207_235 zircon   Zircon  220591Snake Meadow Hill, Westford, Middlesex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 

SampleSource LocalityReference URL
R080085Ashland, Middlesex Co., Massachusetts, USAhttps://rruff.info/R080085

All locality data graciously provided by mindat.org

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