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:
Bugle, Treverbyn, Cornwall, England, UK

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

mindat Locality ID: 14225
mindat URL: http://www.mindat.org/loc-14225.html

Tectonic Settings:

Total number of sublocalities beneath "Bugle, Treverbyn, Cornwall, England, UK": 8
Total number of bottom-level sublocalities: 7

Number of Child Localities: 7
Child Localities:
Goonbarrow China Clay Pit
Imperial Goonbarrow China Clay Works
North Goonbarrow China Clay Pit
Old Beam Mine (Great Beam Mine)
Rock Hill China Clay Pit
Rocks And Treverbyn United Tin Mines
Wheal Henry China Clay Pit

Latitude: 50°23'26"N
Longitude: 4°47'48"W
Decimal Degree (lat, lon): 50.390555555556,-4.7966666666667

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The 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.

Amorphous	Andalusite	Apatite	Beryl	Clay	Feldspar	Fluorite	Kaolinite	Mica	None
Pharmacosiderite	Quartz	Rutile	Sphalerite	Stannite	Talc	Topaz	Tourmaline	Wavellite

Beryl ()*	Cassiterite ()*	Chalcocite ()*	Fluorapatite ()*	Fluorite ()*
Hydroxylapatite ()*	Kaolinite ()*	Muscovite ()*	Olivenite ()*	Opal ()*
Orthoclase ()*	Pharmacosiderite ()*	Quartz ()*	Schorl ()*	Scorodite ()*
Sphalerite ()*	Stannite ()*	Talc ()*	Tenorite ()*	Topaz ()*
Torbernite ()*	Wavellite ()*

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 Ca Cu F Fe H K Mg Na O P S Si Sn U Zn

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Amorphous Andalusite Apatite Beryl Clay Feldspar Fluorite Kaolinite Mica None
Pharmacosiderite Quartz Rutile Sphalerite Stannite Talc Topaz Tourmaline Wavellite

22 IMA Minerals at location:

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Beryl ()*	Beryl	Be₃Al₂Si₆O₁₈	313	253.1	1	119132	4286
Cassiterite ()*	Rutile	SnO₂	324.9	245.9	5	119132,119133,119134,119135,119138	5171
Chalcocite ()*	None	Cu₂S	324.9	245.9	1	119135	5707
Fluorapatite ()*	Apatite	Ca₅(PO₄)₃F	313	253.1	1	119132	2740
Fluorite ()*	Fluorite	CaF₂	313	253.1	2	119132,119134	9617
Hydroxylapatite ()*	Apatite	Ca₅(PO₄)₃OH			1	119134	367
Kaolinite ()*	Clay Kaolinite	Al₂Si₂O₅(OH)₄	324.9	245.9	3	119132,119134,119135	5591
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	289.8	253.1	1	119132	17380
Olivenite ()*	Andalusite	Cu₂(AsO₄)(OH)	324.9	245.9	2	119134,119135	492
Opal ()*	Amorphous	SiO₂·nH₂O			1	119136	2994
Orthoclase ()*	Feldspar	K(AlSi₃O₈)	313	253.1	1	119132	2349
Pharmacosiderite ()*	Pharmacosiderite	KFe³⁺₄(AsO₄)₃(OH)₄·6-7H₂O	324.9	245.9	2	119134,119135	428
Quartz ()*	Quartz	SiO₂	324.9	245.9	2	119132,119135	61156
Schorl ()*	Tourmaline	NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)	324.9	245.9	3	119133,119134,119135	2705
Scorodite ()*	None	Fe³⁺(AsO₄)·2H₂O	324.9	245.9	1	119135	1153
Sphalerite ()*	Sphalerite	ZnS	313	253.1	1	119132	21482
Stannite ()*	Stannite Sphalerite	Cu₂FeSnS₄	313	253.1	1	119132	668
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂	324.9	245.9	1	119135	3337
Tenorite ()*	None	CuO	324.9	245.9	1	119135	1101
Topaz ()*	Topaz	Al₂SiO₄F₂	324.9	245.9	3	119132,119134,119135	1476
Torbernite ()*	None	Cu(UO₂)₂(PO₄)₂·12H₂O			1	119134	1059
Wavellite ()*	Wavellite	Al₃(PO₄)₂(OH)₃·5H₂O	324.9	245.9	2	119134,119135	374

44 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Sample Source	Sample Num	Dated Mineral	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
Lucy_105	276.9	272.7	274.8 ± 2.1 [± 1 std. error mean]	K/Ar	Fifty-four new K/Ar age determinations for micas from fresh granitic rock	mica			1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.2113/gsecongeo.78.6.1064	EG78_1064	Arithmetic mean of all data sets of muscovite and biotite ages
Lucy_106	275.9	266.9	271.4 ± 4.5	K/Ar	Greisens adjacent to sheeted quartz-tourmaline veins	mica	140, 141, 196, 197, 198.		1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	Arithmetic mean of each sample except 141
Lucy_107	272.7	269.1	270.9 ± 1.8	K/Ar	Metafelsite dikes which conspicuously crosscut sheeted veins but which are themselves hydrothermally metamorphosed to a quartz-muscovite-kaolinite assemblages.	mica	206, 213, 214, 218, 221.		1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	Arithmetic mean of each sample
Lucy_108	276.3	272.1	274.2 ± 2.1	K/Ar		mica			1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	Various size fractions separated from completely kaolinized granit
Lucy_109a	313	289	301 ± 12	K/Ar	Range between granite crystallisation (301 ± 12) and closure temperature of 250oC	mica			1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	Since 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_109b	274.7	272.5	273.6 ± 1.1	K/Ar	Range between granite crystallisation (301 ± 12) and closure temperature of 250oC	mica			1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	Since 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_110	282	278	280 ± 2	Rb/Sr	Age of felsite intrusion and sheeted vein mineralisatinon.				1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	These 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_111a	261.7	253.1	257.4 ± 4.3	K/Ar	Stated age of muscovites	muscovite	187	Muscovite	1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_111b	269.6	260.6	265.1 ± 4.5	K/Ar	Stated age of muscovites	muscovite	187	Muscovite	1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_112a	283.2	274.6	285.2 ± 4.6	K/Ar	Stated age of muscovites	muscovite	262	Muscovite	1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_112b	289.8	280.6	266.3 ± 4.3	K/Ar	Stated age of biotite	biotite	262		1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_113a	270.6	262	277.1 ± 4.3	K/Ar	Stated age of biotite	biotite	187		1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_113b	281.3	272.9	278.9 ± 4.3	K/Ar	Stated age of biotite	biotite	187		1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_114a	266.1	257.7	261.9 ± 4.2	K/Ar	Stated age of muscovites	muscovite	188	Muscovite	1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_114b	266.1	257.7	273.4 ± 4.5	K/Ar	Stated age of muscovites	muscovite	188	Muscovite	1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_114c	277.9	268.9	280.0 ± 4.5	K/Ar	Stated age of muscovites	muscovite	247	Muscovite	1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_114d	282.9	274.1	278.5 ± 4.4	K/Ar	Stated age of muscovites	muscovite	247	Muscovite	1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115a	284.2	275.2	279.7 ± 4.5	K/Ar	Stated age of muscovites	muscovite	248	Muscovite	1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115b	289.8	280.6	285.2 ± 4.6	K/Ar	Stated age of muscovites	muscovite	248	Muscovite	1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115c	283.3	274.3	278.8 ± 4.5	K/Ar	Stated age of muscovites	muscovite	248	Muscovite	1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115d	280.8	272.2	276.5 ± 4.3	K/Ar	Stated age of biotite	biotite	186		1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115e	281.6	273	277.3 ± 4.3	K/Ar	Stated age of biotite	biotite	186		1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115f	280.8	272.2	276.5 ± 4.3	K/Ar	Arithmetic mean ± standard error of the mean (muscovites)				1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115g	280.8	272.2	276.5 ± 4.3	K/Ar	Arithmetic mean ± standard error of the mean (biotites)				1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_115h	280.8	272.2	276.5 ± 4.3	K/Ar	Arithmetic mean ± standard error of the mean (all data)				1189	Goonbarrow China Clay Pit, Bugle, Treverbyn, Cornwall, England, UK	Goonbarrow China Clay Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064	New and Previous K/Ar and Rb/Sr Age Determinations for Hercynian Granitic Rocks and Felsite Dikes (Elvans) in Southwest England
Lucy_132f	263.8	255.4	259.6 ± 4.2	K/Ar	New K/Ar determination		196		1190	Imperial Goonbarrow China Clay Works, Bugle, Treverbyn, Cornwall, England, UK	Imperial Goonbarrow	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_132g	271	262.2	266.6 ± 4.4	K/Ar	New K/Ar determination		196		1190	Imperial Goonbarrow China Clay Works, Bugle, Treverbyn, Cornwall, England, UK	Imperial Goonbarrow	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_143a	287.1	277.9	282.5 ± 4.6	K/Ar	New K/Ar ages of Kaolinized granite		501		1190	Imperial Goonbarrow China Clay Works, Bugle, Treverbyn, Cornwall, England, UK	Imperial Goonbarrow	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_143b	296.4	287	291.7 ± 4.7	K/Ar	New K/Ar ages of Kaolinized granite		501		1190	Imperial Goonbarrow China Clay Works, Bugle, Treverbyn, Cornwall, England, UK	Imperial Goonbarrow	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_132b	277.7	269.7	273.7 ± 4	K/Ar	New K/Ar determination		140		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_132c	324.9	315.3	320.1 ± 4.8	K/Ar	New K/Ar determination		141		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_132d	320.4	310.8	315.6 ± 4.8	K/Ar	New K/Ar determination		141		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_132e	305.5	296.3	300.9 ± 4.6	K/Ar	New K/Ar determination		141		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_141a	277.1	268.1	272.6 ± 4.5	K/Ar	New K/Ar ages of Kaolinized granite		263		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_141b	285.7	277.1	281.4 ± 4.3	K/Ar	New K/Ar ages of Kaolinized granite		500		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_141c	282.2	273.6	277.9 ± 4.3	K/Ar	New K/Ar ages of Kaolinized granite		500		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_141d	267.1	258.5	262.8 ± 4.2	K/Ar	New K/Ar ages of Kaolinized granite		263		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam Mine	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_142a	273.2	264.6	268.9 ± 4.3	K/Ar	New K/Ar ages of Kaolinized granite		265		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam-East Goonbarrow	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_142b	253.9	245.9	249.9 ± 4.0	K/Ar	New K/Ar ages of Kaolinized granite		265		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam-East Goonbarrow	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_142c	270.2	261.6	265.9 ± 4.3	K/Ar	New K/Ar ages of Kaolinized granite		265		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam-East Goonbarrow	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_142d	266.2	257.8	262.0 ± 4.2	K/Ar	New K/Ar ages of Kaolinized granite		265		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam-East Goonbarrow	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_142e	270.6	262	266.3 ± 4.3	K/Ar	New K/Ar ages of Kaolinized granite		265		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam-East Goonbarrow	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_142f	273.1	264.5	268.8 ± 4.3	K/Ar	New K/Ar ages of Kaolinized granite		265		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam-East Goonbarrow	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064
Lucy_142g	273.2	264.6	268.9 ± 4.3	K/Ar	New K/Ar ages of Kaolinized granite		265		967	Old Beam Mine (Great Beam Mine), Bugle, Treverbyn, Cornwall, England, UK	Old Beam-East Goonbarrow	Bray and Spooner (1983)	10.1144/GSL.SP.1964.001.01.15	EG78_1064

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...