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:
U.S. Borax Open Pit (Boron Pit), U.S. Borax Mine (Pacific West Coast Borax; Kramer Mine; Baker Mine), Kramer Borate Deposit, Boron, Kramer District (Kramer Borate District), Kern Co., California, USA

Oldest recorded age at locality: 19
Youngest recorded age at locality: 19

mindat Locality ID: 3484
mindat URL: http://www.mindat.org/loc-3484.html

Tectonic Settings:

Total number of sublocalities beneath "U.S. Borax Open Pit (Boron Pit), U.S. Borax Mine (Pacific West Coast Borax; Kramer Mine; Baker Mine), Kramer Borate Deposit, Boron, Kramer District (Kramer Borate District), Kern Co., California, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 35°2'39"N
Longitude: 117°41'39"W
Decimal Degree (lat, lon): 35.044166666667,-117.69416666667

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 As B C Ca Fe H K Mg Mn Na O S Si Sr 

Elements from minerals reported directly at this locality: Al As B C Ca Fe H K Mg Mn Na O S Si Sr 

Structural Groups for minerals in this locality: 
AnalcimeCalciteChabaziteClayGmeliniteHarmotomeHeulanditeMordeniteNickelineNone
OrpimentSmectite-vermiculiteSpinel

28 IMA Minerals at location:
Analcime  (*)Borax  (*)Calcite  (*)Chabazite-Na  (*)Clinoptilolite-Na  (*)
Colemanite  (*)Gmelinite-Na  (*)Greigite  (*)Heulandite-Na  (*)Hydroboracite  (*)
Inderite  (*)Inyoite  (*)Kernite  (*)Kurnakovite  (*)Mazzite-Na  (*)
Meyerhofferite  (*)Mordenite  (*)Orpiment  (*)Phillipsite-Na  (*)Probertite  (*)
Pyrrhotite  (*)Realgar  (*)Rhodochrosite  (*)Saponite  (*)Searlesite  (*)
Tincalconite  (*)Tunellite  (*)Ulexite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Analcime  (*)AnalcimeNa(AlSi2O6)·H2O191901627
Borax  (*)NoneNa2B4O5(OH)4·8H2O1919076
Calcite  (*)CalciteCa(CO3)1919027770
Chabazite-Na  (*)Chabazite(Na3K)[Al4Si8O24]·11H2O1919066
Clinoptilolite-Na  (*)HeulanditeNa6(Si30Al6)O72·20H2O1919024
Colemanite  (*)NoneCaB3O4(OH)3·H2O19190144
Gmelinite-Na  (*)GmeliniteNa4(Si8Al4)O24·11H2O1919025
Greigite  (*)SpinelFe2+Fe3+2S41919062
Heulandite-Na  (*)Heulandite(Na,Ca,K)6(Si,Al)36O72·22H2O1919018
Hydroboracite  (*)NoneCaMg[B3O4(OH)3]2·3H2O1919042
Inderite  (*)NoneMgB3O3(OH)5·5H2O1919013
Inyoite  (*)NoneCaB3O3(OH)5·4H2O1919034
Kernite  (*)NoneNa2B4O6(OH)2·3H2O1919010
Kurnakovite  (*)NoneMgB3O3(OH)5·5H2O1919015
Mazzite-Na  (*)NoneNa8(Si28Al8)O72·30H2O191902
Meyerhofferite  (*)NoneCaB3O3(OH)5·H2O1919023
Mordenite  (*)Mordenite(Na2,Ca,K2)4(Al8Si40)O96·28H2O19190405
Orpiment  (*)OrpimentAs2S319190511
Phillipsite-Na  (*)HarmotomeNa6(Si10Al6)O32·12H2O1919027
Probertite  (*)NoneNaCaB5O7(OH)4·3H2O1919029
Pyrrhotite  (*)NickelineFe7S8191909056
Realgar  (*)NoneAsS19190712
Rhodochrosite  (*)CalciteMn(CO3)191901711
Saponite  (*)Clay Smectite-vermiculite(Ca,Na)0.3(Mg,Fe)3(Si,Al)4O10(OH)2·4H2O19190301
Searlesite  (*)NoneNaBSi2O5(OH)21919034
Tincalconite  (*)NoneNa2B4O5(OH)4·3H2O1919029
Tunellite  (*)NoneSrB6O9(OH)2·3H2O1919012
Ulexite  (*)NoneNaCaB5O6(OH)6·5H2O19190160



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
Scott-OLEB41_307-0001191919 Age of deposition   Yes  80184Kramer Borate Deposit, Boron, Kramer District (Kramer Borate District), Kern Co., California, USAKramer DepositGrew et al. (2011)10.1007/s11084-010-9233-yOLEB41_307the oldest reported kernite is 19 Ma in the Kramer


SampleSource LocalityReference URL


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