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:
Twin Lakes, Fresno Co., California, USA

Oldest recorded age at locality: 114.4
Youngest recorded age at locality: 93.6

mindat Locality ID: 217979
mindat URL: http://www.mindat.org/loc-217979.html

Tectonic Settings:

Total number of sublocalities beneath "Twin Lakes, Fresno Co., California, USA": 14
Total number of bottom-level sublocalities: 11

Number of Child Localities: 3
Child Localities:
Kaiser Ridge
Lower Twin Lake
Upper Twin Lake

Latitude: 37°17'52"N
Longitude: 119°9'19"W
Decimal Degree (lat, lon): 37.297777777778,-119.15527777778
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 C Ca Cu F Fe H K Mg Na O S Si Ti W 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AmphiboleBruciteCalciteClayClinozoisiteDiasporeEpidoteFeldsparGarnetHumite
IlvaiteLudwigiteMicaNickelineNonePertsevitePyroxeneScheeliteSpinelTitanite
VesuvianiteWollastonite

26 IMA Minerals at location:
Anorthite  (*)Brucite  (*)Chalcocite  (*)Clinohumite  (*)Clintonite  (*)
Diaspore  (*)Diopside  (*)Epidote  (*)Grossular  (*)Hedenbergite  (*)
Ilvaite  (*)Ludwigite  (*)Magnesite  (*)Magnetite  (*)Orthoclase  (*)
Pargasite  (*)Pertsevite-(F)  (*)Phlogopite  (*)Pyrrhotite  (*)Scheelite  (*)
Spinel  (*)Titanite  (*)Tremolite  (*)Vesuvianite  (*)Wightmanite  (*)
Wollastonite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Anorthite  (*)FeldsparCa(Al2Si2O8)11560581036
Brucite  (*)BruciteMg(OH)21156058462
Chalcocite  (*)NoneCu2S11560585707
Clinohumite  (*)HumiteMg9(SiO4)4F21156058236
Clintonite  (*)Mica ClayCaAlMg2(SiAl3O10)(OH)2115605886
Diaspore  (*)DiasporeAlO(OH)1156058481
Diopside  (*)PyroxeneCaMgSi2O611560584135
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)11560588173
Grossular  (*)GarnetCa3Al2(SiO4)311560581544
Hedenbergite  (*)PyroxeneCaFe2+Si2O61156058741
Ilvaite  (*)IlvaiteCaFe3+Fe2+2O(Si2O7)(OH)1156058197
Ludwigite  (*)LudwigiteMg2Fe3+O2(BO3)2156056,156058134
Magnesite  (*)CalciteMg(CO3)11560641487
Magnetite  (*)SpinelFe2+Fe3+2O4115605814899
Orthoclase  (*)FeldsparK(AlSi3O8)11560582349
Pargasite  (*)AmphiboleNaCa2(Mg4Al)(Si6Al2)O22(OH)21156058313
Pertsevite-(F)  (*)PertseviteMg2(BO3)F11560588
Phlogopite  (*)Mica ClayKMg3(AlSi3O10)(OH)211560582273
Pyrrhotite  (*)NickelineFe7S811560589056
Scheelite  (*)ScheeliteCa(WO4)114.493.62156058,1560614894
Spinel  (*)SpinelMgAl2O411560581934
Titanite  (*)TitaniteCaTi(SiO4)O11560584899
Tremolite  (*)Amphibole   Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)211560582562
Vesuvianite  (*)Vesuvianite(Ca,Na)19(Al,Mg,Fe)13(SiO4)10(Si2O7)4(OH,F,O)1011560581395
Wightmanite  (*)NoneMg5O(BO3)(OH)5·2H2O11560583
Wollastonite  (*)WollastoniteCaSiO32156058,1560671247


1 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
NAVDAT-32431114.493.6104±10.4   32431    76448Question And Twin Lakes Claim, Upper Twin Lake, Twin Lakes, Fresno Co., California, USA NAVDAT NAVDAT 

SampleSource LocalityReference URL

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