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:
Rockport, Essex Co., Massachusetts, USA

Oldest recorded age at locality: 457
Youngest recorded age at locality: 418

mindat Locality ID: 3825
mindat URL: http://www.mindat.org/loc-3825.html

Tectonic Settings:

Total number of sublocalities beneath "Rockport, Essex Co., Massachusetts, USA": 5
Total number of bottom-level sublocalities: 4

Number of Child Localities: 3
Child Localities:
Pigeon Cove Diabase Porphyry Prospect
Pigeon Hill Quarries
Rockport Granite Company Quarries

Latitude: 42°40'41"N
Longitude: 70°37'44"W
Decimal Degree (lat, lon): 42.678055555556,-70.628888888889
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 Be C Ca F Fe H K Mg Mo Na Nb O Pb S Si Th Ti Y Zn Zr 

Elements from minerals reported directly at this locality: Al Be Ca Fe H K Mg Na Nb O Pb S Si Ti Y Zn Zr 

Structural Groups for minerals in this locality: 
AmphiboleAstrophylliteCalciteCancrinite-sodaliteClayCorundumFeldsparFluoriteMicaMolybdenite
NickelineNoneOlivinePyritePyroxeneQuartzRocksaltScheeliteSodaliteSpinel
TalcZirconZirconolite

29 IMA Minerals at location:
Albite  (*)Annite  (*)Astrophyllite  (*)Augite  (*)Calcite  (*)
Danalite  (*)Fayalite  (*)Fergusonite-(Y)  (*)Ferro-anthophyllite  (*)Fluorite  (*)
Galena  (*)Genthelvite  (*)Grunerite  (*)Hastingsite  (*)Hedenbergite  (*)
Hematite  (*)Ilmenite  (*)Magnetite  (*)Microcline  (*)Minnesotaite  (*)
Molybdenite  (*)Muscovite  (*)Orthoclase  (*)Pyrite  (*)Pyrrhotite  (*)
Quartz  (*)Thorite  (*)Zircon  (*)Zirconolite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Albite  (*)FeldsparNa(AlSi3O8)45741808803
Annite  (*)Mica ClayKFe2+3(AlSi3O10)(OH)24574180356
Astrophyllite  (*)AstrophylliteK2NaFe2+7Ti2(Si4O12)2O2(OH)4F4574181219387161
Augite  (*)Pyroxene(Ca,Mg,Fe)2Si2O612193852060
Calcite  (*)CalciteCa(CO3)431.82419.82121938927770
Danalite  (*)Cancrinite-sodalite SodaliteBe3Fe2+4(SiO4)3S431.82419.822219387,21938958
Fayalite  (*)OlivineFe2+2(SiO4)4574182219387,219388371
Fergusonite-(Y)  (*)ScheeliteYNbO44574180196
Ferro-anthophyllite  (*)Amphibole   Fe2+2Fe2+5Si8O22(OH)245741805
Fluorite  (*)FluoriteCaF2431.82419.822219387,2193899617
Galena  (*)RocksaltPbS457418024243
Genthelvite  (*)Cancrinite-sodalite SodaliteBe3Zn4(SiO4)3S457418060
Grunerite  (*)Amphibole   Fe2+2Fe2+5Si8O22(OH)24574181219387223
Hastingsite  (*)AmphiboleNaCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)24574180209
Hedenbergite  (*)PyroxeneCaFe2+Si2O64574181219388741
Hematite  (*)CorundumFe2O34574182219386,21938814640
Ilmenite  (*)CorundumFe2+Ti4+O345741812193885433
Magnetite  (*)SpinelFe2+Fe3+2O44574184219385,219387,219388,21938914899
Microcline  (*)FeldsparK(AlSi3O8)45741812193884924
Minnesotaite  (*)Clay TalcFe2+3Si4O10(OH)2457418061
Molybdenite  (*)MolybdeniteMoS2431.82419.8212193895800
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2457418017380
Orthoclase  (*)FeldsparK(AlSi3O8)45741802349
Pyrite  (*)PyriteFeS2121938639462
Pyrrhotite  (*)NickelineFe7S845741809056
Quartz  (*)QuartzSiO24574184219386,219387,219388,21938961156
Thorite  (*)ZirconTh(SiO4)431.82419.8212193891006
Zircon  (*)ZirconZr(SiO4)4574183219387,219388,2193895251
Zirconolite  (*)Zirconolite(Ca,Y)Zr(Ti,Mg,Al)2O74574180140


8 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-00934431.82419.82425.82±6Rb-Srage of intrusionwhole rock     47041Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-00935431.82419.82425.82±6Rb-Srage of intrusionwhole rock     47041Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-U-Th-Pb-00150_206_238426418422±4206_238 zircon   Zircon  47041Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-00150_207_206457445451±6207_206 zircon   Zircon  47041Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-U-Th-Pb-00150_207_235431423427±4207_235 zircon   Zircon  47041Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA USGS-U-Th-Pb USGS-U-Th-Pb 
USGS-Rb-Sr-00936431.82419.82425.82±6Rb-Srage of intrusionwhole rock     209564Flat Ledge Quarry (Flatledge Quarry), Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-00937431.82419.82425.82±6Rb-Srage of intrusionwhole rock     209564Flat Ledge Quarry (Flatledge Quarry), Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-00938431.82419.82425.82±6Rb-Srage meaning uncertain (geologic factors)whole rock     209564Flat Ledge Quarry (Flatledge Quarry), Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA USGS-Rb-Sr USGS-Rb-Sr 

SampleSource LocalityReference URL
R080134Rockport, Essex Co., Massachusetts, USAhttps://rruff.info/R080134

All locality data graciously provided by mindat.org

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