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:
Sweet Grass Co., Montana, USA

Oldest recorded age at locality: 2912.61
Youngest recorded age at locality: 74.89

mindat Locality ID: 131434
mindat URL: http://www.mindat.org/loc-131434.html

Tectonic Settings:

Total number of sublocalities beneath "Sweet Grass Co., Montana, USA": 129
Total number of bottom-level sublocalities: 124

Number of Child Localities: 21
Child Localities:
Ayers Property
Boulder Calcite (Boot)
Bridger Creek Occurrence
Cartwright Calcite Deposit (Cartwright Crystal Spar Group)
Curry Calcite Deposit
Deer Creek
Fox Occurrence
Independence Mining District
Kelly Prospect (Badger Group)
Natural Bridge
Smith Homestead
Stemwinder Prospect
Stillwater Complex
Swamp Lake Area Prospect
Ueland Calcite Deposit
Unnamed Calcite Deposit (MRDS - 10172838)
Unnamed Calcite Deposit (MRDS - 10173347)
Unnamed Calcite Deposit (MRDS - 10245716)
Unnamed Copper Mine (MRDS - 10197445)
Unnamed Copper Occurrence (MRDS - 10294385)
Whittaker Property

Latitude: 45°41'11"N
Longitude: 110°4'9"W
Decimal Degree (lat, lon): 45.686388888889,-110.06916666667

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: Ag Al As Au Bi C Ca Cr Cu Fe H Hg K Mg Ni O Os Pb Pd Pt Ru S Sb Si Sn Te Ti Zn 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AmphiboleAuricuprideBaryteCalciteChalcopyriteClayClinozoisiteCopperCorundumEpidote
MeloniteMicaNickelineNoneNot in a structural groupPentlanditePerovskitePotaritePyritePyroxene
QuartzRocksaltSphaleriteSpinelStillwateriteTalcUllmannite

42 IMA Minerals at location:
Anglesite  (*)Augite  (*)Braggite  (*)Calcite  (*)Chalcopyrite  (*)
Chromite  (*)Clinozoisite  (*)Cooperite  (*)Enstatite  (*)Epidote  (*)
Erlichmanite  (*)Galena  (*)Gold  (*)Graphite  (*)Hessite  (*)
Ilmenite  (*)Keithconnite  (*)Kotulskite  (*)Laumontite  (*)Laurite  (*)
Mackinawite  (*)Magnetite  (*)Melonite  (*)Merenskyite  (*)Michenerite  (*)
Moncheite  (*)Palarstanide  (*)Pentlandite  (*)Phlogopite  (*)Pyrite  (*)
Pyrrhotite  (*)Quartz  (*)Sperrylite  (*)Sphalerite  (*)Stibiopalladinite  (*)
Talc  (*)Temagamite  (*)Tetraferroplatinum  (*)Tremolite  (*)Violarite  (*)
Vysotskite  (*)Zvyagintsevite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Anglesite  (*)BarytePb(SO4)12341732734
Augite  (*)Pyroxene(Ca,Mg,Fe)2Si2O62906268112342332060
Braggite  (*)NonePdPt3S429062188.32234209,234236101
Calcite  (*)CalciteCa(CO3)290626812234123,23423327770
Chalcopyrite  (*)ChalcopyriteCuFeS229062188.319234197,234200,234201,234203,234206,234207,234209,234214,234216,234220,234223,234224,234225,234228,234231,234233,234236,234240,23424227198
Chromite  (*)SpinelFe2+Cr2O42906268123234180,234181,234182,234183,234184,234185,234186,234187,234188,234189,234190,234194,234196,234198,234205,234210,234211,234217,234219,234223,234227,234241,2342423902
Clinozoisite  (*)Clinozoisite EpidoteCa2Al3[Si2O7][SiO4]O(OH)2906268112342331025
Cooperite  (*)NonePtS290626811234209124
Enstatite  (*)PyroxeneMg2Si2O6290626812234209,234233944
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)290626812234209,2342338173
Erlichmanite  (*)PyriteOsS2290626811234209110
Galena  (*)RocksaltPbS290626812234173,23422824243
Gold  (*)CopperAu290626812234223,23422830554
Graphite  (*)NoneC290626812234228,2342332812
Hessite  (*)NoneAg2Te290626811234223804
Ilmenite  (*)CorundumFe2+Ti4+O3290626812234223,2342335433
Keithconnite  (*)NonePd20Te729062681123423340
Kotulskite  (*)NickelinePd(Te,Bi)2-x (x ≈ 0.4)290626812234209,234233116
Laumontite  (*)Not in a structural groupCaAl2Si4O12·4H2O12341231271
Laurite  (*)PyriteRuS2290626811234242226
Mackinawite  (*)None(Fe,Ni)1+xS (x = 0-0.07)290626811234223451
Magnetite  (*)SpinelFe2+Fe3+2O42906268115234197,234200,234201,234203,234206,234207,234214,234216,234220,234224,234225,234228,234231,234233,23424014899
Melonite  (*)MeloniteNiTe2290626811234223207
Merenskyite  (*)MelonitePdTe2290626811234223155
Michenerite  (*)UllmannitePdBiTe290626811234223114
Moncheite  (*)MelonitePt(Te,Bi)2290626812234209,234233133
Palarstanide  (*)StillwateritePd5(Sn,As)229062681123423313
Pentlandite  (*)Pentlandite(Ni,Fe)9S829062188.319234197,234200,234201,234203,234206,234207,234209,234214,234216,234220,234223,234224,234225,234228,234231,234233,234236,234240,2342421512
Phlogopite  (*)Mica ClayKMg3(AlSi3O10)(OH)2290626813234216,234231,2342402273
Pyrite  (*)PyriteFeS2290626818234173,234209,234216,234223,234228,234231,234233,23424039462
Pyrrhotite  (*)NickelineFe7S829062188.318234197,234200,234201,234203,234206,234207,234209,234214,234216,234220,234223,234224,234225,234228,234231,234233,234236,2342409056
Quartz  (*)QuartzSiO229062681123423361156
Sperrylite  (*)PyritePtAs2290626813234228,234233,234242337
Sphalerite  (*)SphaleriteZnS29062681123422821482
Stibiopalladinite  (*)NonePd5Sb229062681123423375
Talc  (*)Clay TalcMg3Si4O10(OH)2290626815234209,234216,234231,234233,2342403337
Temagamite  (*)NonePd3HgTe329062681123423324
Tetraferroplatinum  (*)PotaritePtFe29062681123420966
Tremolite  (*)Amphibole   Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2290626815234209,234216,234231,234233,2342402562
Violarite  (*)SpinelFeNi2S4290626811234223380
Vysotskite  (*)NonePdS29062681123420953
Zvyagintsevite  (*)Auricupride PerovskitePd3Pb29062681123420932



23 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
JP35_1717-00001290627542830±76Re-Os high 81MVL217, 801M02, 355-64-556.0, 355-64-684.5, 355- Yes  3883Stillwater Complex, Nye, Stillwater Co., Montana, USAStillwater PGE deposit, Montana, USALambert et al. (1994)10.1093/petrology/35.6.1717JP35_1717 
JP35_1717-00002272126812701±20Sm-Nd high   Yes  3883Stillwater Complex, Nye, Stillwater Co., Montana, USAStillwater PGE deposit, Montana, USALambert et al. (1994)10.1093/petrology/35.6.1717JP35_1717 
NAVDAT-3839475.7374.8975.31±0.42   38394    160509Butte And Butte No. 1 Claims, Deer Creek, Sweet Grass Co., Montana, USA NAVDAT NAVDAT 
NAVDAT-3841475.7374.8975.31±0.42   38414    161517Fox Occurrence, Sweet Grass Co., Montana, USA NAVDAT NAVDAT 
USGS-Rb-Sr-031332912.612412.612662.61±250Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031342841.52679.52760.5±81Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031352832.862746.862789.86±43Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031362891.82801.82846.8±45Rb-Srage of metamorphic crystallizationwhole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031372912.612412.612662.61±250Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031382681.142595.142638.14±43Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031392912.612412.612662.61±250Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031402841.52679.52760.5±81Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031412832.862746.862789.86±43Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031422891.82801.82846.8±45Rb-Srage of metamorphic crystallizationwhole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031432912.612412.612662.61±250Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031442841.52679.52760.5±81Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031452832.862746.862789.86±43Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031462891.82801.82846.8±45Rb-Srage of metamorphic crystallizationwhole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031472912.612412.612662.61±250Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031482841.52679.52760.5±81Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031492832.862746.862789.86±43Rb-Sr whole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-031502891.82801.82846.8±45Rb-Srage of metamorphic crystallizationwhole rock     163974Pine Claim, Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 
USGS-Rb-Sr-030992608.32188.32398.3±210Rb-Srminimum age of intrusionwhole rock     164889Stillwater Mine (Johns-Manville Stillwater Platinum; Stillwater PGM Resources; Stillwater Platinum Project; M Prospect), Stillwater Complex, Sweet Grass Co., Montana, USA USGS-Rb-Sr USGS-Rb-Sr 


SampleSource LocalityReference URL


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