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:
Okehampton Hamlets, West Devon, Devon, England, UK

Oldest recorded age at locality: 308
Youngest recorded age at locality: 249

mindat Locality ID: 302081
mindat URL: http://www.mindat.org/loc-302081.html

Tectonic Settings:

Total number of sublocalities beneath "Okehampton Hamlets, West Devon, Devon, England, UK": 7
Total number of bottom-level sublocalities: 7

Number of Child Localities: 7
Child Localities:
Homerton Mine
Meldon Aplite Quarry
Meldon Mine (Red-a-Ven Mine; Okehampton Wheal Maria; Devon Copper Mine)
Meldon Quarry (British Rail Quarry; British Railways Quarry; B. R. Quarry)
Meldon Reservoir
Okehampton Consols
Wheal Forest (Forest Mine; Okement Consols)

Latitude: 50°42'26"N
Longitude: 4°1'58"W
Decimal Degree (lat, lon): 50.707222222222,-4.0327777777778
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 Be Bi C Ca Ce Cl Cs Cu F Fe H K Li Mg Mn Mo Na Nb O P Pb S Sb Si Sn Ta Ti U W Zn 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AllophaneAluminiteAmphiboleAnalcimeApatiteArsenicArsenoliteArsenopyriteAutuniteAxinite
BerylBerylloniteBrookiteCalciteChalcopyriteChloriteClayClinozoisiteColumbiteCorundum
DanburiteEpidoteFeldsparFluoriteGadoliniteGarnetLöllingiteMelanteriteMicaMolybdenite
NickelineNoneNot in a structural groupOlivinePalygorskitePrehnitePyritePyrochlorePyroxeneQuartz
RhodoniteRocksaltScapoliteScheeliteSmectite-vermiculiteSphaleriteStibniteStilbiteTitaniteTopaz
TourmalineVesuvianiteWollastonite

74 IMA Minerals at location:
Actinolite  (*)Albite  (*)Allophane  (*)Aluminite  (*)Amblygonite  (*)
Anatase  (*)Andradite  (*)Antimony  (*)Arsenic  (*)Arsenolite  (*)
Arsenopyrite  (*)Autunite  (*)Axinite-(Fe)  (*)Bavenite  (*)Beryl  (*)
Beryllonite  (*)Bismuth  (*)Bismuthinite  (*)Bornite  (*)Brookite  (*)
Bustamite  (*)Calcite  (*)Chalcopyrite  (*)Chamosite  (*)Columbite-(Mn)  (*)
Cordierite  (*)Danburite  (*)Datolite  (*)Diopside  (*)Elbaite  (*)
Epidote  (*)Ferro-actinolite  (*)Fersmite  (*)Fluorapatite  (*)Fluorite  (*)
Galena  (*)Gibbsite  (*)Grossular  (*)Hedenbergite  (*)Hematite  (*)
Herderite  (*)Laumontite  (*)Löllingite  (*)Malayaite  (*)Marialite  (*)
Melanterite  (*)Molybdenite  (*)Montebrasite  (*)Montmorillonite  (*)Muscovite  (*)
Orthoclase  (*)Palygorskite  (*)Petalite  (*)Pollucite  (*)Prehnite  (*)
Pyrite  (*)Pyrrhotite  (*)Quartz  (*)Rhodochrosite  (*)Rhodonite  (*)
Scheelite  (*)Siderite  (*)Spessartine  (*)Sphalerite  (*)Stibiconite  (*)
Stilbite-Ca  (*)Tantalite-(Mn)  (*)Tephroite  (*)Titanite  (*)Topaz  (*)
Tremolite  (*)Vesuvianite  (*)Wollastonite  (*)Zoisite  (*)
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)23082492120558,1205603419
Albite  (*)FeldsparNa(AlSi3O8)2952492120558,1205638803
Allophane  (*)AllophaneAl2O3(SiO2)1.3-2.0·2.5-3.0H2O3082841120559470
Aluminite  (*)AluminiteAl2(SO4)(OH)4·7H2O308284112056078
Amblygonite  (*)NoneLiAl(PO4)F2812491120558244
Anatase  (*)Not in a structural groupTiO230828411205602162
Andradite  (*)GarnetCa3Fe3+2(SiO4)33082842120559,1205601534
Antimony  (*)ArsenicSb2812491120558363
Arsenic  (*)ArsenicAs2812491120558379
Arsenolite  (*)ArsenoliteAs2O32812491120558231
Arsenopyrite  (*)ArsenopyriteFeAsS3082495120557,120558,120559,120560,1205639052
Autunite  (*)AutuniteCa(UO2)2(PO4)2·10-12H2O28124911205581272
Axinite-(Fe)  (*)AxiniteCa4Fe2+2Al4[B2Si8O30](OH)23082492120558,120560260
Bavenite  (*)NoneCa4Be2+xAl2-xSi9O26-x(OH)2+x (x = 0 to 1)3082492120558,120560255
Beryl  (*)BerylBe3Al2Si6O1828124911205584286
Beryllonite  (*)BerylloniteNaBe(PO4)281249112055847
Bismuth  (*)ArsenicBi30828411205601966
Bismuthinite  (*)StibniteBi2S330828411205601935
Bornite  (*)NoneCu5FeS430828411205595516
Brookite  (*)BrookiteTiO23082841120560700
Bustamite  (*)WollastoniteMn2Ca2MnCa(Si3O9)23082841120560101
Calcite  (*)CalciteCa(CO3)3082493120557,120558,12056027770
Chalcopyrite  (*)ChalcopyriteCuFeS23082494120558,120559,120560,12056327198
Chamosite  (*)Chlorite Clay(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)83082841120560577
Columbite-(Mn)  (*)ColumbiteMn2+Nb2O62812491120558289
Cordierite  (*)BerylMg2Al4Si5O1828124911205581008
Danburite  (*)DanburiteCaB2Si2O83082842120559,120560148
Datolite  (*)GadoliniteCaB(SiO4)(OH)3082493120558,120559,120560498
Diopside  (*)PyroxeneCaMgSi2O63082492120558,1205604135
Elbaite  (*)TourmalineNa(Al1.5Li1.5)Al6(Si6O18)(BO3)3(OH)3(OH)2812491120558520
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)3082492120558,1205598173
Ferro-actinolite  (*)Amphibole   Ca2(Mg2.5-0.0Fe2+2.5-5.0)Si8O22(OH)23082841120560129
Fersmite  (*)ColumbiteCaNb2O6281249112055883
Fluorapatite  (*)ApatiteCa5(PO4)3F3082492120558,1205602740
Fluorite  (*)FluoriteCaF23082492120558,1205609617
Galena  (*)RocksaltPbS308284112056024243
Gibbsite  (*)NoneAl(OH)33082841120560504
Grossular  (*)GarnetCa3Al2(SiO4)33082493120558,120559,1205601544
Hedenbergite  (*)PyroxeneCaFe2+Si2O63082492120558,120559741
Hematite  (*)CorundumFe2O3295295112056114640
Herderite  (*)GadoliniteCaBe(PO4)F281249112055820
Laumontite  (*)Not in a structural groupCaAl2Si4O12·4H2O3082492120558,1205601271
Löllingite  (*)LöllingiteFeAs23082493120558,120559,120560762
Malayaite  (*)TitaniteCaSnO(SiO4)3082492120558,12055940
Marialite  (*)ScapoliteNa4Al3Si9O24Cl2812491120558139
Melanterite  (*)MelanteriteFe(SO4)·7H2O3082841120559915
Molybdenite  (*)MolybdeniteMoS23082842120559,1205605800
Montebrasite  (*)NoneLiAl(PO4)(OH)2812491120558200
Montmorillonite  (*)Clay Smectite-vermiculite(Na,Ca)0.3(Al,Mg)2Si4O10(OH)2·nH2O3082492120558,1205601508
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2259249112055817380
Orthoclase  (*)FeldsparK(AlSi3O8)3082493120558,120560,1205632349
Palygorskite  (*)Palygorskite Clay(Mg,Al)2Si4O10(OH)·4H2O2812491120558306
Petalite  (*)Not in a structural groupLiAlSi4O102812491120558124
Pollucite  (*)AnalcimeCs(Si2Al)O6·nH2O2812491120558140
Prehnite  (*)PrehniteCa2Al(Si3Al)O10(OH)23082492120558,1205601898
Pyrite  (*)PyriteFeS23082494120558,120559,120560,12056239462
Pyrrhotite  (*)NickelineFe7S83082493120558,120559,1205609056
Quartz  (*)QuartzSiO23082496120557,120558,120559,120560,120562,12056361156
Rhodochrosite  (*)CalciteMn(CO3)30828411205601711
Rhodonite  (*)RhodoniteCaMn3Mn(Si5O15)3082841120560969
Scheelite  (*)ScheeliteCa(WO4)3082493120558,120559,1205604894
Siderite  (*)CalciteFe(CO3)3082492120558,1205606417
Spessartine  (*)GarnetMn2+3Al2(SiO4)330828411205601214
Sphalerite  (*)SphaleriteZnS3082842120559,12056021482
Stibiconite  (*)PyrochloreSb3+Sb5+2O6(OH)2812491120558446
Stilbite-Ca  (*)StilbiteNaCa4(Si27Al9)O72·28H2O2812491120558268
Tantalite-(Mn)  (*)ColumbiteMn2+Ta2O62812491120558211
Tephroite  (*)OlivineMn2+2(SiO4)3082841120560240
Titanite  (*)TitaniteCaTi(SiO4)O30828411205604899
Topaz  (*)TopazAl2SiO4F228124911205581476
Tremolite  (*)Amphibole   Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)228124911205582562
Vesuvianite  (*)Vesuvianite(Ca,Na)19(Al,Mg,Fe)13(SiO4)10(Si2O7)4(OH,F,O)103082842120559,1205601395
Wollastonite  (*)WollastoniteCaSiO33082493120558,120559,1205601247
Zoisite  (*)EpidoteCa2Al3[Si2O7][SiO4]O(OH)28124911205581025


9 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
Bradley_2012_093281277279±2Rb-Sr       4572Meldon Aplite Quarry, Okehampton Hamlets, West Devon, Devon, England, UKMeldon apliteMcCauley and Bradley (2014)10.3749/canmin.52.2.183CM52_183 
Lucy_051281277279 ± 2Rb-SrPreferred Age determined in study E 38443, E 38444, E 38445, E 38446, E 38447, E 384    4572Meldon Aplite Quarry, Okehampton Hamlets, West Devon, Devon, England, UKMeldon QuarryDarbyshire et al. (1985)10.1144/gsjgs.142.6.1159JGSL142_1159Regression of the data yields an isochron age of 279 ± 2
Lucy_052265255260 ± 5K-ArMuch younger mica age obtained, may be acounted for argon loss.lepidolite     4572Meldon Aplite Quarry, Okehampton Hamlets, West Devon, Devon, England, UKMeldon QuarryDarbyshire et al. (1985)10.1144/gsjgs.142.6.1159JGSL142_1159Using K-Ar Age on lepidolite, it was concluded that the aplite was much younger than the granite
Lucy_214259249254 ± 5K-ArAge for Dartmoor Granitemuscovite   Muscovite  4572Meldon Aplite Quarry, Okehampton Hamlets, West Devon, Devon, England, UKMeldon ApliteMiller et al (1964)10.1002/gj.3350040109GJ4_105New ages on the granites and derived rocks
Lucy_096308284296 ± 12        105601Meldon Mine (Red-a-Ven Mine; Okehampton Wheal Maria; Devon Copper Mine), Okehampton Hamlets, West Devon, Devon, England, UKMeldonFitch et al. (1964)10.1144/GSL.SP.1964.001.01.16GSL1_159Age cited
Lucy_097301289295 ± 6        105601Meldon Mine (Red-a-Ven Mine; Okehampton Wheal Maria; Devon Copper Mine), Okehampton Hamlets, West Devon, Devon, England, UKMeldonFitch et al. (1964)10.1144/GSL.SP.1964.001.01.16GSL1_159Age cited
Lucy_082295295295K/ArAge of cotact metamorphism      4571Meldon Quarry (British Rail Quarry; British Railways Quarry; B. R. Quarry), Okehampton Hamlets, West Devon, Devon, England, UKMeldonHawkes et al. (1978 US4_51Age of contact metamorphism from intrusion of doloritic dyke and is equated to plutons in the area
Lucy_212308284296 ± 12K-ArLocality unknown      4571Meldon Quarry (British Rail Quarry; British Railways Quarry; B. R. Quarry), Okehampton Hamlets, West Devon, Devon, England, UKRailway Quarry (Meldon)Miller et al (1964)10.1002/gj.3350040109GJ4_105New ages for basic igneous rocks from south-west England.
Lucy_213301289295 ± 6K-ArLocality unknown      4571Meldon Quarry (British Rail Quarry; British Railways Quarry; B. R. Quarry), Okehampton Hamlets, West Devon, Devon, England, UKMeldonMiller et al (1964)10.1002/gj.3350040109GJ4_105New ages for basic igneous rocks from south-west England.

SampleSource LocalityReference URL
FKM-58Meldon Mine (Red-a-Ven Mine; Okehampton Wheal Maria; Devon Copper Mine), Okehampton Hamlets, West Devon, Devon, England, UKhttps://www.rockptx.com/fkm-51-to-fkm-75/#FKM-58

All locality data graciously provided by mindat.org

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