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:
Helen Beryl Mine (Sweepstakes Beryl; Big Tom Claim; Kem Claim), Fourmile, Custer District, Custer Co., South Dakota, USA

Oldest recorded age at locality: 1702
Youngest recorded age at locality: 1702

mindat Locality ID: 11785
mindat URL: http://www.mindat.org/loc-11785.html

Tectonic Settings:

Total number of sublocalities beneath "Helen Beryl Mine (Sweepstakes Beryl; Big Tom Claim; Kem Claim), Fourmile, Custer District, Custer Co., South Dakota, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 43°42'46"N
Longitude: 103°41'49"W
Decimal Degree (lat, lon): 43.712777777778,-103.69694444444
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 Ca F Fe H K Li Mg Mn Na Nb O P Si Sn Ta 

Elements from minerals reported directly at this locality: Al B Be Ca F Fe H K Li Mn Na O P Si Sn Ta 

Structural Groups for minerals in this locality: 
AlluauditeAmorphousApatiteBerylChildreniteClayClinozoisiteColumbiteCorundumEpidote
FeldsparMicaNoneNot in a structural groupOlivinePyroxeneQuartzRutileTourmalineVivianite

23 IMA Minerals at location:
Albite  (*)Alluaudite  (*)Amblygonite  (*)Bertrandite  (*)Beryl  (*)
Cassiterite  (*)Childrenite  (*)Epidote  (*)Fluorapatite  (*)Hematite  (*)
Heterosite  (*)Ixiolite  (*)Microcline  (*)Muscovite  (*)Opal  (*)
Purpurite  (*)Quartz  (*)Schorl  (*)Sicklerite  (*)Sillimanite  (*)
Spodumene  (*)Triphylite  (*)Vivianite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Albite  (*)FeldsparNa(AlSi3O8)1702170208803
Alluaudite  (*)Alluaudite   NaMnFe3+2(PO4)317021702094
Amblygonite  (*)NoneLiAl(PO4)F170217020244
Bertrandite  (*)Not in a structural groupBe4Si2O7(OH)2170217020606
Beryl  (*)BerylBe3Al2Si6O181702170204286
Cassiterite  (*)RutileSnO21702170205171
Childrenite  (*)ChildreniteFe2+Al(PO4)(OH)2·H2O17021702093
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)1702170208173
Fluorapatite  (*)ApatiteCa5(PO4)3F1702170202740
Hematite  (*)CorundumFe2O317021702014640
Heterosite  (*)OlivineFe3+(PO4)170217020204
Ixiolite  (*)Columbite(Ta2/3Mn2+1/3)O2170217020148
Microcline  (*)FeldsparK(AlSi3O8)1702170204924
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)217021702017380
Opal  (*)AmorphousSiO2·nH2O1702170202994
Purpurite  (*)OlivineMn3+(PO4)17021702080
Quartz  (*)QuartzSiO217021702061156
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)1702170202705
Sicklerite  (*)OlivineLiMn2+(PO4)17021702066
Sillimanite  (*)Not in a structural groupAl2SiO51702170201516
Spodumene  (*)PyroxeneLiAlSi2O6170217020688
Triphylite  (*)OlivineLiFe2+(PO4)170217020313
Vivianite  (*)VivianiteFe2+3(PO4)2·8H2O170217020636


2 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
Be-00046170217021702  high   YesFaheyiteBe45259Roosevelt Group (Rough Rider), Custer, Custer District, Custer Co., South Dakota, USA Dahl and Foland (2008)10.2138/am.2008.2633AM93_1215 
Be-00023170217021702  high   YesEhrleite, Fransoletite, Greifensteinite, Pahasapaite, Parafransoletite, Roscherite, TiptopiteBe4122Tip Top Mine (Tip Top Pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA Dahl and Foland (2008)10.2138/am.2008.2633AM93_1215 

SampleSource LocalityReference URL

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