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:
Tophet Hill Mine, Lynnfield, Essex Co., Massachusetts, USA

Oldest recorded age at locality: 369
Youngest recorded age at locality: 246

mindat Locality ID: 32074
mindat URL: http://www.mindat.org/loc-32074.html

Tectonic Settings:

Total number of sublocalities beneath "Tophet Hill Mine, Lynnfield, Essex Co., Massachusetts, USA": 0
Total number of bottom-level sublocalities: 0

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: Ca F Fe O Pb S 

Elements from minerals reported directly at this locality: Ca F Fe O Pb S 

Structural Groups for minerals in this locality: 
CorundumFluoriteNonePyriteRocksalt

4 IMA Minerals at location:
Fluorite  (*)Galena  (*)Hematite  (*)Pyrite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Fluorite  (*)FluoriteCaF236924609617
Galena  (*)RocksaltPbS369246024243
Hematite  (*)CorundumFe2O3369246014640
Pyrite  (*)PyriteFeS2369246039462


3 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
Alexandra-0417262246254 ± 8K-ArAge of basaltwhole rock  Yes  22345Lynnfield, Essex Co., Massachusetts, USALynnfkldZartman et al. (1970)10.1130/0016-7606(1970)81[3359:APDOKR]2.0.CO;2GSAB81_3359 
Alexandra-0418268252260 ± 8K-ArAge of granitebiotite  Yes  22345Lynnfield, Essex Co., Massachusetts, USALynnfkldZartman et al. (1970)10.1130/0016-7606(1970)81[3359:APDOKR]2.0.CO;2GSAB81_3359 
Alexandra-0419369349359 ± 10K-ArAge of granitehornblende  Yes  22345Lynnfield, Essex Co., Massachusetts, USALynnfkldZartman et al. (1970)10.1130/0016-7606(1970)81[3359:APDOKR]2.0.CO;2GSAB81_3359 

SampleSource LocalityReference URL

All locality data graciously provided by mindat.org

All age data...

Other copyright data...