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:
San Diego Mine (K. C. Naylor Mine), Gem Hill, Mesa Grande District, San Diego Co., California, USA

Oldest recorded age at locality: 102.4
Youngest recorded age at locality: 93.1

mindat Locality ID: 6785
mindat URL: http://www.mindat.org/loc-6785.html

Tectonic Settings:

Total number of sublocalities beneath "San Diego Mine (K. C. Naylor Mine), Gem Hill, Mesa Grande District, San Diego Co., California, USA": 1
Total number of bottom-level sublocalities: 1

Number of Child Localities: 1
Child Localities:
Trask Mine

Latitude: 33°12'41"N
Longitude: 116°47'55"W
Decimal Degree (lat, lon): 33.211388888889,-116.79861111111
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 Ce F Fe H K Li Mn Na Nb O P Sb Si Ta Ti 

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

Structural Groups for minerals in this locality: 
AeschyniteBerylColumbiteFeldsparGarnetNonePyroxeneQuartzTourmaline

12 IMA Minerals at location:
Albite  (*)Beryl  (*)Elbaite  (*)Fersmite  (*)Microcline  (*)
Montebrasite  (*)Quartz  (*)Rynersonite  (*)Schorl  (*)Spessartine  (*)
Spodumene  (*)Stibiotantalite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Albite  (*)FeldsparNa(AlSi3O8)102.493.108803
Beryl  (*)BerylBe3Al2Si6O18102.493.104286
Elbaite  (*)TourmalineNa(Al1.5Li1.5)Al6(Si6O18)(BO3)3(OH)3(OH)102.493.11174814520
Fersmite  (*)ColumbiteCaNb2O6102.493.1083
Microcline  (*)FeldsparK(AlSi3O8)102.493.104924
Montebrasite  (*)NoneLiAl(PO4)(OH)102.493.10200
Quartz  (*)QuartzSiO2102.493.1117481461156
Rynersonite  (*)AeschyniteCaTa2O6102.493.1014
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)102.493.111748142705
Spessartine  (*)GarnetMn2+3Al2(SiO4)3102.493.101214
Spodumene  (*)PyroxeneLiAlSi2O6102.493.10688
Stibiotantalite  (*)NoneSb3+TaO4102.493.1117481453


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
Giersdorf_00000330102.494.498.4±4K-Ar       6785San Diego Mine (K. C. Naylor Mine), Gem Hill, Mesa Grande District, San Diego Co., California, USASan Diego MineFisher et al. (1999)10.1080/00357529809603037RM73_156 
Giersdorf_00000331101.193.197.1±4K-Ar     Muscovite 6785San Diego Mine (K. C. Naylor Mine), Gem Hill, Mesa Grande District, San Diego Co., California, USASan Diego MineFisher et al. (1999)10.1080/00357529809603038RM73_156 

SampleSource LocalityReference URL

All locality data graciously provided by mindat.org

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