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:
Treverbyn, Cornwall, England, UK

Oldest recorded age at locality: 324.9
Youngest recorded age at locality: 245.9

mindat Locality ID: 14226
mindat URL: http://www.mindat.org/loc-14226.html

Tectonic Settings:

Total number of sublocalities beneath "Treverbyn, Cornwall, England, UK": 46
Total number of bottom-level sublocalities: 34

Number of Child Localities: 10
Child Localities:
Bugle
Carbean
Carluddon
Carn Grey
Greensplat
Menear
Ruddlemoor
Stenalees
Trenance Downs
Trethurgy

Latitude: 50°21'58"N
Longitude: 4°47'24"W
Decimal Degree (lat, lon): 50.366111111111,-4.79
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 Cl Cu F Fe H K La Li Mg Mn Na Nb O P Pb S Si Sn Sr Ti U W Zn Zr 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AluniteAmorphousAndalusiteApatiteArseniosideriteArsenopyriteArthuriteBerauniteBerylBrochantite
ChalcopyriteClayColumbiteConnelliteCopperCorundumCovelliteDigeniteDufréniteFeldspar
FluoriteKaoliniteLazuliteLeucophosphiteMalachiteMicaNoneNot in a structural groupPharmacosideritePhosphosiderite
QuartzRockbridgeiteRutileScheeliteSmectite-vermiculiteSphaleriteStanniteStannoiditeStibniteStrunzite
TalcTetrahedriteTopazTourmalineTurquoiseWarditeWavelliteWurtziteZircon

76 IMA Minerals at location:
Albite  (*)Arsenopyrite  (*)Arthurite  (*)Azurite  (*)Barbosalite  (*)
Beraunite  (*)Beryl  (*)Bismuthinite  (*)Brochantite  (*)Cacoxenite  (*)
Cassiterite  (*)Chalcocite  (*)Chalcopyrite  (*)Chalcosiderite  (*)Columbite-(Mn)  (*)
Connellite  (*)Copper  (*)Corundum  (*)Covellite  (*)Cuprite  (*)
Cuprotungstite  (*)Cyrilovite  (*)Digenite  (*)Dravite  (*)Dufrénite  (*)
Elbaite  (*)Ferberite  (*)Florencite-(La)  (*)Fluorapatite  (*)Fluorite  (*)
Frondelite  (*)Goyazite  (*)Hematite  (*)Hentschelite  (*)Hydroxylapatite  (*)
Kaolinite  (*)Kuramite  (*)Leucophosphite  (*)Libethenite  (*)Malachite  (*)
Mawsonite  (*)Metatorbernite  (*)Metavariscite  (*)Microcline  (*)Mitridatite  (*)
Morinite  (*)Muscovite  (*)Nontronite  (*)Olivenite  (*)Opal  (*)
Orthoclase  (*)Pharmacosiderite  (*)Pseudomalachite  (*)Pyromorphite  (*)Quartz  (*)
Rockbridgeite  (*)Rutile  (*)Scheelite  (*)Schorl  (*)Scorodite  (*)
Sphalerite  (*)Stannite  (*)Stannoidite  (*)Strunzite  (*)Talc  (*)
Tennantite-(Fe)  (*)Tenorite  (*)Topaz  (*)Torbernite  (*)Turquoise  (*)
Variscite  (*)Varlamoffite  (*)Wavellite  (*)Waylandite  (*)Wurtzite  (*)
Zircon  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Albite  (*)FeldsparNa(AlSi3O8)278.726811191628803
Arsenopyrite  (*)ArsenopyriteFeAsS278.726811191629052
Arthurite  (*)ArthuriteCuFe3+2(AsO4)2(OH)2·4H2O278.7268111916235
Azurite  (*)Not in a structural groupCu3(CO3)2(OH)2278.726811191625509
Barbosalite  (*)LazuliteFe2+Fe3+2(PO4)2(OH)2278.7268111916243
Beraunite  (*)BerauniteFe3+6(PO4)4O(OH)4·6H2O278.72681119162136
Beryl  (*)BerylBe3Al2Si6O18313253.12119132,1191624286
Bismuthinite  (*)StibniteBi2S3278.726811191621935
Brochantite  (*)BrochantiteCu4(SO4)(OH)6278.726811191621633
Cacoxenite  (*)NoneFe3+24AlO6(PO4)17(OH)12·75H2O278.72681119162280
Cassiterite  (*)RutileSnO2324.9245.914119132,119133,119134,119135,119138,119146,119155,119160,119161,119162,119163,119164,119173,1191755171
Chalcocite  (*)NoneCu2S324.9245.911191355707
Chalcopyrite  (*)ChalcopyriteCuFeS2278.7268111916227198
Chalcosiderite  (*)TurquoiseCuFe3+6(PO4)4(OH)8·4H2O278.7268111916277
Columbite-(Mn)  (*)ColumbiteMn2+Nb2O6278.72681119162289
Connellite  (*)ConnelliteCu36(SO4)(OH)62Cl8·6H2O278.72681119162295
Copper  (*)CopperCu278.726811191623846
Corundum  (*)CorundumAl2O3278.726811191621797
Covellite  (*)CovelliteCuS278.726811191624165
Cuprite  (*)Not in a structural groupCu2O278.726811191622970
Cuprotungstite  (*)NoneCu2+3(WO4)2(OH)2278.7268111916267
Cyrilovite  (*)WarditeNaFe3+3(PO4)2(OH)4·2H2O278.7268111916260
Digenite  (*)DigeniteCu1.8S278.726811191621027
Dravite  (*)TourmalineNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)278.72681119162648
Dufrénite  (*)DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6·2H2O278.72681119162139
Elbaite  (*)TourmalineNa(Al1.5Li1.5)Al6(Si6O18)(BO3)3(OH)3(OH)278.72681119162520
Ferberite  (*)ColumbiteFe2+(WO4)278.72681119162551
Florencite-(La)  (*)AluniteLaAl3(PO4)2(OH)6278.7268111916212
Fluorapatite  (*)ApatiteCa5(PO4)3F313253.12119132,1191622740
Fluorite  (*)FluoriteCaF2313253.14119132,119134,119162,1191639617
Frondelite  (*)Rockbridgeite(Mn2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5278.7268111916252
Goyazite  (*)AluniteSrAl3(PO4)(PO3OH)(OH)6278.72681119162173
Hematite  (*)CorundumFe2O3111917614640
Hentschelite  (*)LazuliteCuFe3+2(PO4)2(OH)2278.7268111916220
Hydroxylapatite  (*)ApatiteCa5(PO4)3OH1119134367
Kaolinite  (*)Clay KaoliniteAl2Si2O5(OH)4324.9245.96119132,119134,119135,119146,119162,1191635591
Kuramite  (*)Stannite SphaleriteCu3SnS4278.7268111916212
Leucophosphite  (*)LeucophosphiteKFe3+2(PO4)2(OH)·2H2O278.72681119162110
Libethenite  (*)AndalusiteCu2(PO4)(OH)278.72681119162234
Malachite  (*)MalachiteCu2(CO3)(OH)2278.7268111916212537
Mawsonite  (*)NoneCu6Fe2SnS8278.7268111916292
Metatorbernite  (*)NoneCu(UO2)2(PO4)2·8H2O278.72681119162443
Metavariscite  (*)PhosphosideriteAl(PO4)·2H2O278.7268111916227
Microcline  (*)FeldsparK(AlSi3O8)278.726811191624924
Mitridatite  (*)ArseniosideriteCa2Fe3+3O2(PO4)3·3H2O278.72681119162129
Morinite  (*)NoneNaCa2Al2(PO4)2(OH)F4·2H2O278.7268111916222
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2289.8253.14119132,119148,119162,11916317380
Nontronite  (*)Clay Smectite-vermiculiteNa0.3Fe3+2(Si,Al)4O10(OH)2·nH2O1119146471
Olivenite  (*)AndalusiteCu2(AsO4)(OH)324.9245.92119134,119135492
Opal  (*)AmorphousSiO2·nH2O278.72683119136,119146,1191622994
Orthoclase  (*)FeldsparK(AlSi3O8)313253.13119132,119150,1191622349
Pharmacosiderite  (*)PharmacosideriteKFe3+4(AsO4)3(OH)4·6-7H2O324.9245.93119134,119135,119162428
Pseudomalachite  (*)NoneCu5(PO4)2(OH)4278.72681119162369
Pyromorphite  (*)ApatitePb5(PO4)3Cl278.726811191621725
Quartz  (*)QuartzSiO2324.9245.97119132,119135,119142,119143,119146,119162,11916361156
Rockbridgeite  (*)Rockbridgeite(Fe2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5278.72681119162206
Rutile  (*)RutileTiO2278.726811191625614
Scheelite  (*)ScheeliteCa(WO4)278.726811191624894
Schorl  (*)TourmalineNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)324.9245.97119133,119134,119135,119148,119150,119162,1191632705
Scorodite  (*)NoneFe3+(AsO4)·2H2O324.9245.92119135,1191621153
Sphalerite  (*)SphaleriteZnS313253.1111913221482
Stannite  (*)Stannite SphaleriteCu2FeSnS4313253.12119132,119162668
Stannoidite  (*)StannoiditeCu8(Fe,Zn)3Sn2S12278.7268111916280
Strunzite  (*)StrunziteMn2+Fe3+2(PO4)2(OH)2·6H2O278.7268111916298
Talc  (*)Clay TalcMg3Si4O10(OH)2324.9245.911191353337
Tennantite-(Fe)  (*)TetrahedriteCu6(Cu4Fe2)As4S13278.726811191621803
Tenorite  (*)NoneCuO324.9245.911191351101
Topaz  (*)TopazAl2SiO4F2324.9245.95119132,119134,119135,119142,1191621476
Torbernite  (*)NoneCu(UO2)2(PO4)2·12H2O278.72682119134,1191621059
Turquoise  (*)TurquoiseCuAl6(PO4)4(OH)8·4H2O278.72683119161,119162,119163484
Variscite  (*)NoneAl(PO4)·2H2O278.72682119162,119163301
Varlamoffite  (*)Rutile(Sn,Fe)(O,OH)2278.72682119161,11916256
Wavellite  (*)WavelliteAl3(PO4)2(OH)3·5H2O324.9245.94119134,119135,119162,119163374
Waylandite  (*)AluniteBiAl3(PO4)2(OH)6278.7268111916231
Wurtzite  (*)WurtziteZnS278.72681119162372
Zircon  (*)ZirconZr(SiO4)278.726811191625251


48 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
Lucy_105276.9272.7274.8 ± 2.1 [± 1 std. error mean]K/ArFifty-four new K/Ar age determinations for micas from fresh granitic rockmica     1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.2113/gsecongeo.78.6.1064EG78_1064Arithmetic mean of all data sets of muscovite and biotite ages
Lucy_106275.9266.9271.4 ± 4.5K/ArGreisens adjacent to sheeted quartz-tourmaline veinsmica140, 141, 196, 197, 198.    1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064Arithmetic mean of each sample except 141
Lucy_107272.7269.1270.9 ± 1.8K/ArMetafelsite dikes which conspicuously crosscut sheeted veins but which are themselves hydrothermally metamorphosed to a quartz-muscovite-kaolinite assemblages.mica206, 213, 214, 218, 221.    1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064Arithmetic mean of each sample
Lucy_108276.3272.1274.2 ± 2.1K/Ar mica     1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064Various size fractions separated from completely kaolinized granit
Lucy_109a313289301 ± 12K/ArRange between granite crystallisation (301 ± 12) and closure temperature of 250oCmica     1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064Since evidence suggests that secondary muscovite and kaolinitc in metafelsite dikes and kaolinized granite are significantly cogenetic, these data and the geologic relationships indicate that sheeted vein mineralization, greisenization, and kaolinization were simultaneous processes which occurred in the time interval between granite crystallization at 301±12 m.y. (whole-rock Rb/Sr isochron for the St. Austell granite) and cooling below a mica closure temperature of '~250oC at 273.6±1.1 m.y. (pooled K-Ar age based on 50 acceptable values).
Lucy_109b274.7272.5273.6 ± 1.1K/ArRange between granite crystallisation (301 ± 12) and closure temperature of 250oCmica     1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064Since evidence suggests that secondary muscovite and kaolinitc in metafelsite dikes and kaolinized granite are significantly cogenetic, these data and the geologic relationships indicate that sheeted vein mineralization, greisenization, and kaolinization were simultaneous processes which occurred in the time interval between granite crystallization at 301±12 m.y. (whole-rock Rb/Sr isochron for the St. Austell granite) and cooling below a mica closure temperature of '~250oC at 273.6±1.1 m.y. (pooled K-Ar age based on 50 acceptable values).
Lucy_110282278280 ± 2Rb/SrAge of felsite intrusion and sheeted vein mineralisatinon.      1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064These dates are consistent with an estimate of 280 ± 2 m.y., based on five Rb/Sr age determinations, for the time of felsite dike intrusion and sheeted vein mineralization.
Lucy_111a261.7253.1257.4 ± 4.3K/ArStated age of muscovitesmuscovite187  Muscovite  1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_111b269.6260.6265.1 ± 4.5K/ArStated age of muscovitesmuscovite187  Muscovite  1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_112a283.2274.6285.2 ± 4.6K/ArStated age of muscovitesmuscovite262  Muscovite  1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_112b289.8280.6266.3 ± 4.3K/ArStated age of biotitebiotite262    1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_113a270.6262277.1 ± 4.3K/ArStated age of biotitebiotite187    1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_113b281.3272.9278.9 ± 4.3K/ArStated age of biotitebiotite187    1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_114a266.1257.7261.9 ± 4.2K/ArStated age of muscovitesmuscovite188  Muscovite  1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_114b266.1257.7273.4 ± 4.5K/ArStated age of muscovitesmuscovite188  Muscovite  1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_114c277.9268.9280.0 ± 4.5K/ArStated age of muscovitesmuscovite247  Muscovite  1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_114d282.9274.1278.5 ± 4.4K/ArStated age of muscovitesmuscovite247  Muscovite  1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115a284.2275.2279.7 ± 4.5K/ArStated age of muscovitesmuscovite248  Muscovite  1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115b289.8280.6285.2 ± 4.6K/ArStated age of muscovitesmuscovite248  Muscovite  1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115c283.3274.3278.8 ± 4.5K/ArStated age of muscovitesmuscovite248  Muscovite  1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115d280.8272.2276.5 ± 4.3K/ArStated age of biotitebiotite186    1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115e281.6273277.3 ± 4.3K/ArStated age of biotitebiotite186    1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115f280.8272.2276.5 ± 4.3K/ArArithmetic mean ± standard error of the mean (muscovites)      1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115g280.8272.2276.5 ± 4.3K/ArArithmetic mean ± standard error of the mean (biotites)      1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115h280.8272.2276.5 ± 4.3K/ArArithmetic mean ± standard error of the mean (all data)      1189Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UKGoonbarrow China Clay MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_132f263.8255.4259.6 ± 4.2K/ArNew K/Ar determination 196    1190Imperial Goonbarrow China Clay Works, Bugle, Treverbyn, Cornwall, England, UKImperial GoonbarrowBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_132g271262.2266.6 ± 4.4K/ArNew K/Ar determination 196    1190Imperial Goonbarrow China Clay Works, Bugle, Treverbyn, Cornwall, England, UKImperial GoonbarrowBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_143a287.1277.9282.5 ± 4.6K/ArNew K/Ar ages of Kaolinized granite 501    1190Imperial Goonbarrow China Clay Works, Bugle, Treverbyn, Cornwall, England, UKImperial GoonbarrowBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_143b296.4287291.7 ± 4.7K/ArNew K/Ar ages of Kaolinized granite 501    1190Imperial Goonbarrow China Clay Works, Bugle, Treverbyn, Cornwall, England, UKImperial GoonbarrowBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_132b277.7269.7273.7 ± 4K/ArNew K/Ar determination 140    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld BeamBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_132c324.9315.3320.1 ± 4.8K/ArNew K/Ar determination 141    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld BeamBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_132d320.4310.8315.6 ± 4.8K/ArNew K/Ar determination 141    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld BeamBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_132e305.5296.3300.9 ± 4.6K/ArNew K/Ar determination 141    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld BeamBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_141a277.1268.1272.6 ± 4.5K/ArNew K/Ar ages of Kaolinized granite 263    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld Beam MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_141b285.7277.1281.4 ± 4.3K/ArNew K/Ar ages of Kaolinized granite 500    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld Beam MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_141c282.2273.6277.9 ± 4.3K/ArNew K/Ar ages of Kaolinized granite 500    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld Beam MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_141d267.1258.5262.8 ± 4.2K/ArNew K/Ar ages of Kaolinized granite 263    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld Beam MineBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_142a273.2264.6268.9 ± 4.3K/ArNew K/Ar ages of Kaolinized granite 265    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld Beam-East GoonbarrowBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_142b253.9245.9249.9 ± 4.0K/ArNew K/Ar ages of Kaolinized granite 265    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld Beam-East GoonbarrowBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_142c270.2261.6265.9 ± 4.3K/ArNew K/Ar ages of Kaolinized granite 265    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld Beam-East GoonbarrowBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_142d266.2257.8262.0 ± 4.2K/ArNew K/Ar ages of Kaolinized granite 265    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld Beam-East GoonbarrowBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_142e270.6262266.3 ± 4.3K/ArNew K/Ar ages of Kaolinized granite 265    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld Beam-East GoonbarrowBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_142f273.1264.5268.8 ± 4.3K/ArNew K/Ar ages of Kaolinized granite 265    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld Beam-East GoonbarrowBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_142g273.2264.6268.9 ± 4.3K/ArNew K/Ar ages of Kaolinized granite 265    967Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UKOld Beam-East GoonbarrowBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_138a277.7269.1273.4 ± 4.3K/ArNew K/Ar determination 223    965Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UKGunheathBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_138b278.7269.5274.1 ± 4.6K/ArNew K/Ar determination 230    965Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UKGunheathBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_138c276.8268272.4 ± 4.4K/ArNew K/Ar determination 237    965Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UKGunheathBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064 
Lucy_138d273.9272.9273.4 ± 4.3K/ArNew K/Ar determination      965Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UKGunheathBray and Spooner (1983)10.1144/GSL.SP.1964.001.01.15EG78_1064Arithmetic mean of 3 samples

SampleSource LocalityReference URL
R060339Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UKhttps://rruff.info/R060339
R060504Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UKhttps://rruff.info/R060504
R060338Gunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UKhttps://rruff.info/R060338

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