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:
Ajo District, Pima Co., Arizona, USA

Oldest recorded age at locality: 67.1
Youngest recorded age at locality: 0

mindat Locality ID: 29459
mindat URL: http://www.mindat.org/loc-29459.html

Tectonic Settings:

Total number of sublocalities beneath "Ajo District, Pima Co., Arizona, USA": 48
Total number of bottom-level sublocalities: 36

Number of Child Localities: 10
Child Localities:
Alfred Group
Barry M. Goldwater Air Force Range
Bates Well
Chico Shuni Hills
Copper Ridge Group
Crescent Et Al Claims
Hells Kitchen Mine (Hells Kitchen 1 And 2)
Little Ajo Mts
Old Hickles Property
Sunshine Mine

Latitude: 32°21'23"N
Longitude: 112°52'55"W
Decimal Degree (lat, lon): 32.356388888889,-112.88194444444
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 B Ba C Ca Cl Co Cr Cu F Fe H K Mg Mn Mo Na Nb O P Pb S Sb Si Ti U V Zn Zr 

Elements from minerals reported directly at this locality: Al Ca H Mg O Si 

Structural Groups for minerals in this locality: 
AdeliteAjoiteAllophaneAluniteAmorphousAmphiboleAndalusiteApatiteAragoniteAtacamite
BaryteBrochantiteBrookiteCalciteChalcopyriteChloriteClayClinozoisiteColumbiteConnellite
CopperCorundumCovelliteDescloiziteDevillineDiasporeEnargiteEpidoteEpsomiteErionite
FeldsparFerrieriteFornaciteGillespiteGypsumKaoliniteMalachiteMelanteriteMicaMolybdenite
NoneNot in a structural groupOlivinePalygorskitePlancheitePseudobrookitePyritePyrochlorePyroxeneQuartz
RocksaltRutileSmectite-vermiculiteSphaleriteSpinelSulphurTalcTetrahedriteTitaniteTopaz
TourmalineTridymiteTurquoiseWurtziteZircon

102 IMA Minerals at location:
Actinolite  (*)Ajoite  (*)Albite  (*)Allophane  (*)Alunite  (*)
Anatase  (*)Andalusite  (*)Anhydrite  (*)Ankerite  (*)Atacamite  (*)
Augite  (*)Aurichalcite  (*)Azurite  (*)Baryte  (*)Beidellite  (*)
Bieberite  (*)Bornite  (*)Brochantite  (*)Brookite  (*)Calcite  (*)
Cerussite  (*)Chalcocite  (*)Chalcopyrite  (*)Chamosite  (*)Chlorargyrite  (*)
Chrysocolla  (*)Clinochlore  (*)Columbite-(Fe)  (*)Conichalcite  (*)Connellite  (*)
Copper  (*)Covellite  (*)Cuprite  (*)Cuprorivaite  (*)Devilline  (*)
Diaspore  (*)Dolomite  (*)Enargite  (*)Enstatite  (*)Epidote  (*)
Epsomite  (*)Erionite-Ca  (*)Ferrierite-Na  (*)Fluorapatite  (*)Fornacite  (*)
Forsterite  (*)Galena  (*)Goethite  (*)Gold  (*)Gypsum  (*)
Halite  (*)Hematite  (*)Ilmenite  (*)Jarosite  (*)Kaolinite  (*)
Laumontite  (*)Lechatelierite  (*)Magnesio-hornblende  (*)Magnetite  (*)Malachite  (*)
Melanterite  (*)Meta-alunogen  (*)Microcline  (*)Molybdenite  (*)Mottramite  (*)
Muscovite  (*)Neotocite  (*)Nontronite  (*)Olivenite  (*)Opal  (*)
Orthoclase  (*)Palygorskite  (*)Papagoite  (*)Phlogopite  (*)Plancheite  (*)
Planerite  (*)Posnjakite  (*)Pseudobrookite  (*)Pseudomalachite  (*)Pyrite  (*)
Pyrolusite  (*)Quartz  (*)Ranciéite  (*)Rutile  (*)Sanidine  (*)
Schorl  (*)Shattuckite  (*)Siderite  (*)Silver  (*)Sphalerite  (*)
Stibiconite  (*)Sulphur  (*)Talc  (*)Tennantite-(Fe)  (*)Tenorite  (*)
Tetrahedrite-(Zn)  (*)Titanite  (*)Topaz  (*)Torbernite  (*)Tridymite  (*)
Turquoise  (*)Zircon  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Actinolite  (*)Amphibole   Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2636311434633419
Ajoite  (*)AjoiteK3Cu2+20Al3Si29O76(OH)16·8H2O6363114344711
Albite  (*)FeldsparNa(AlSi3O8)636311434478803
Allophane  (*)AllophaneAl2O3(SiO2)1.3-2.0·2.5-3.0H2O63631143447470
Alunite  (*)NoneKAl3(SO4)2(OH)663632143447,143448966
Anatase  (*)Not in a structural groupTiO2636311434472162
Andalusite  (*)AndalusiteAl2SiO5636311434631310
Anhydrite  (*)Not in a structural groupCa(SO4)63632143440,1434471588
Ankerite  (*)NoneCa(Fe2+,Mg)(CO3)263633143444,143447,1434533092
Atacamite  (*)AtacamiteCu2Cl(OH)363631143447544
Augite  (*)Pyroxene(Ca,Mg,Fe)2Si2O663632143447,1434512060
Aurichalcite  (*)None(Zn,Cu)5(CO3)2(OH)663631143447919
Azurite  (*)Not in a structural groupCu3(CO3)2(OH)2636311434475509
Baryte  (*)BaryteBa(SO4)63635143437,143444,143447,143448,14345311547
Beidellite  (*)Clay Smectite-vermiculite(Na,Ca)0.3Al2(Si,Al)4O10(OH)2·nH2O63632143447,14345685
Bieberite  (*)MelanteriteCo(SO4)·7H2O6363114344750
Bornite  (*)NoneCu5FeS4636311434475516
Brochantite  (*)BrochantiteCu4(SO4)(OH)6636311434471633
Brookite  (*)BrookiteTiO263631143447700
Calcite  (*)CalciteCa(CO3)63632143447,14345727770
Cerussite  (*)AragonitePb(CO3)16.0614.9811434494979
Chalcocite  (*)NoneCu2S63634143441,143442,143447,1434595707
Chalcopyrite  (*)ChalcopyriteCuFeS267.102143447,14345527198
Chamosite  (*)Chlorite Clay(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)863631143447577
Chlorargyrite  (*)RocksaltAgCl16.0614.9811434491382
Chrysocolla  (*)Allophane(Cu2-xAlx)H2-xSi2O5(OH)4·nH2O63632143447,1434573531
Clinochlore  (*)Chlorite ClayMg5Al(AlSi3O10)(OH)8636311434471756
Columbite-(Fe)  (*)ColumbiteFe2+Nb2O663633143433,143434,143435518
Conichalcite  (*)AdeliteCaCu(AsO4)(OH)63631143447363
Connellite  (*)ConnelliteCu36(SO4)(OH)62Cl8·6H2O63631143447295
Copper  (*)CopperCu63632143440,1434473846
Covellite  (*)CovelliteCuS636311434474165
Cuprite  (*)Not in a structural groupCu2O636311434472970
Cuprorivaite  (*)GillespiteCaCuSi4O10636311434408
Devilline  (*)DevillineCaCu4(SO4)2(OH)6·3H2O63631143447366
Diaspore  (*)DiasporeAlO(OH)63631143447481
Dolomite  (*)NoneCaMg(CO3)2636311434479895
Enargite  (*)Enargite WurtziteCu3AsS463631143447910
Enstatite  (*)PyroxeneMg2Si2O663633143440,143451,143464944
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)67.1634143444,143447,143455,1434578173
Epsomite  (*)EpsomiteMg(SO4)·7H2O63631143447484
Erionite-Ca  (*)ErioniteCa5[Si26Al10O72]·30H2O67.10031
Ferrierite-Na  (*)Ferrierite(Na,K)5(Si31Al5)O72·18H2O636311434476
Fluorapatite  (*)ApatiteCa5(PO4)3F636311434472740
Fornacite  (*)FornaciteCuPb2(CrO4)(AsO4)(OH)16.0614.98114344985
Forsterite  (*)OlivineMg2(SiO4)636311434471188
Galena  (*)RocksaltPbS6363114344724243
Goethite  (*)DiasporeFeO(OH)636311434477437
Gold  (*)CopperAu63633143445,143447,14345230554
Gypsum  (*)GypsumCa(SO4)·2H2O636311434476890
Halite  (*)RocksaltNaCl636311434471398
Hematite  (*)CorundumFe2O367.1638143444,143447,143451,143453,143455,143456,143457,14346414640
Ilmenite  (*)CorundumFe2+Ti4+O363632143447,1434515433
Jarosite  (*)AluniteKFe3+3(SO4)2(OH)6636311434472228
Kaolinite  (*)Clay KaoliniteAl2Si2O5(OH)4636311434475591
Laumontite  (*)Not in a structural groupCaAl2Si4O12·4H2O636311434471271
Lechatelierite  (*)AmorphousSiO267.10062
Magnesio-hornblende  (*)Amphibole   Ca2(Mg4Al)(Si7Al)O22(OH)267.100238
Magnetite  (*)SpinelFe2+Fe3+2O46363114344714899
Malachite  (*)MalachiteCu2(CO3)(OH)263633143447,143453,14345712537
Melanterite  (*)MelanteriteFe(SO4)·7H2O63631143447915
Meta-alunogen  (*)NoneAl2(SO4)3·14H2O636311434478
Microcline  (*)FeldsparK(AlSi3O8)636311434474924
Molybdenite  (*)MolybdeniteMoS2636311434475800
Mottramite  (*)DescloizitePbCu(VO4)(OH)63632143447,143448362
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)263633143432,143447,14344817380
Neotocite  (*)Allophane(Mn,Fe)SiO3·H2O (?)63631143447186
Nontronite  (*)Clay Smectite-vermiculiteNa0.3Fe3+2(Si,Al)4O10(OH)2·nH2O63632143447,143453471
Olivenite  (*)AndalusiteCu2(AsO4)(OH)63631143447492
Opal  (*)AmorphousSiO2·nH2O636311434472994
Orthoclase  (*)FeldsparK(AlSi3O8)636311434472349
Palygorskite  (*)Palygorskite Clay(Mg,Al)2Si4O10(OH)·4H2O63631143447306
Papagoite  (*)NoneCaCuAlSi2O6(OH)3636311434474
Phlogopite  (*)Mica ClayKMg3(AlSi3O10)(OH)263632143447,1434642273
Plancheite  (*)PlancheiteCu8(Si4O11)2(OH)4·H2O6363114344774
Planerite  (*)TurquoiseAl6(PO4)2(PO3OH)2(OH)8·4H2O67.102143447,14345543
Posnjakite  (*)NoneCu4(SO4)(OH)6·H2O63631143447309
Pseudobrookite  (*)Pseudobrookite(Fe3+2Ti)O563632143451,143464164
Pseudomalachite  (*)NoneCu5(PO4)2(OH)463631143447369
Pyrite  (*)PyriteFeS26363114344739462
Pyrolusite  (*)RutileMnO2636311434473106
Quartz  (*)QuartzSiO263634143444,143447,143448,14346461156
Ranciéite  (*)None(Ca,Mn2+)0.2(Mn4+,Mn3+)O2·0.6H2O63631143464177
Rutile  (*)RutileTiO2636311434475614
Sanidine  (*)FeldsparK(AlSi3O8)16.0614.981143450598
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)67.1011434392705
Shattuckite  (*)NoneCu5(SiO3)4(OH)26363114344771
Siderite  (*)CalciteFe(CO3)636311434476417
Silver  (*)CopperAg636311434475186
Sphalerite  (*)SphaleriteZnS6363114344721482
Stibiconite  (*)PyrochloreSb3+Sb5+2O6(OH)63631143447446
Sulphur  (*)SulphurS636311434472045
Talc  (*)Clay TalcMg3Si4O10(OH)2636311434473337
Tennantite-(Fe)  (*)TetrahedriteCu6(Cu4Fe2)As4S13636311434471803
Tenorite  (*)NoneCuO636311434471101
Tetrahedrite-(Zn)  (*)TetrahedriteCu6(Cu4Zn2)Sb4S13636311434475317
Titanite  (*)TitaniteCaTi(SiO4)O636311434474899
Topaz  (*)TopazAl2SiO4F2636311434631476
Torbernite  (*)NoneCu(UO2)2(PO4)2·12H2O636311434471059
Tridymite  (*)TridymiteSiO263631143451458
Turquoise  (*)TurquoiseCuAl6(PO4)4(OH)8·4H2O63631143447484
Zircon  (*)ZirconZr(SiO4)636311434475251


21 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
EG94_211-00047636363Pb-Pb whole rock?805    3370New Cornelia Mine (Ajo Mine), Ajo, Little Ajo Mts, Ajo District, Pima Co., Arizona, USAAjoBouse et al. (1999)10.2113/gsecongeo.94.2.211EG94_211 
EG94_211-00048636363Pb-Pb whole rock?806    3370New Cornelia Mine (Ajo Mine), Ajo, Little Ajo Mts, Ajo District, Pima Co., Arizona, USAAjoBouse et al. (1999)10.2113/gsecongeo.94.2.211EG94_211 
EG94_211-00049636363Pb-Pb whole rock?214    3370New Cornelia Mine (Ajo Mine), Ajo, Little Ajo Mts, Ajo District, Pima Co., Arizona, USAAjoBouse et al. (1999)10.2113/gsecongeo.94.2.211EG94_211 
PorphCu-00011636363      Albite, Alunite, Bornite, Brochantite, Chalcocite, Chalcopyrite, Chrysocolla, Covellite, Cuprite, Epidote, Gold, Ilmenite, Jarosite, Magnetite, Malachite, Molybdenite, Pyrite, Shattuckite, SphaleriteCu3370New Cornelia Mine (Ajo Mine), Ajo, Little Ajo Mts, Ajo District, Pima Co., Arizona, USAAjoSinger et al. (2008) USGSOFR2008_1155 
Giersdorf_0000044616.0614.9815.52±0.54K-Ar  UAKA-72-64    43662Batamote Mts, Ajo Area, Little Ajo Mts, Ajo District, Pima Co., Arizona, USABatamote HillsShafiqullah et al. (1980) AGSD12_201 
NAVDAT-1680567.154.961±6.1   16805    64136Camelback Mountain, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-1680667.154.961±6.1   16806    64136Camelback Mountain, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-1680767.154.961±6.1   16807    64136Camelback Mountain, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-1680867.154.961±6.1   16808    64136Camelback Mountain, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-1681827.522.525±2.5   16818    64136Camelback Mountain, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-1682225012+13/-12   16822    64136Camelback Mountain, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-8878723.923.523.7±0.2  zircon88787  Zircon  64136Camelback Mountain, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-8879223.923.523.7±0.2  zircon88792  Zircon  64136Camelback Mountain, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-88794656364±1   88794    64136Camelback Mountain, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-88795656364±1   88795    64136Camelback Mountain, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-8877627.722.325±2.7   88776    67392Eighty-Five Group, Little Ajo Mts, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-1681027.522.525±2.5   16810    189558Old Hickles Property, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-1681127.522.525±2.5   16811    189558Old Hickles Property, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-8880123.923.523.7±0.2  zircon88801  Zircon  189558Old Hickles Property, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-8880323.923.523.7±0.2  zircon88803  Zircon  189558Old Hickles Property, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 
NAVDAT-8880423.923.523.7±0.2  zircon88804  Zircon  189558Old Hickles Property, Ajo District, Pima Co., Arizona, USA NAVDAT NAVDAT 

SampleSource LocalityReference URL
R040182Ajo, Little Ajo Mts, Ajo District, Pima Co., Arizona, USAhttps://rruff.info/R040182
R050133Ajo, Little Ajo Mts, Ajo District, Pima Co., Arizona, USAhttps://rruff.info/R050133
R120018New Cornelia Mine (Ajo Mine), Ajo, Little Ajo Mts, Ajo District, Pima Co., Arizona, USAhttps://rruff.info/R120018
R120017New Cornelia Mine (Ajo Mine), Ajo, Little Ajo Mts, Ajo District, Pima Co., Arizona, USAhttps://rruff.info/R120017

All locality data graciously provided by mindat.org

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