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:
Guern, Morbihan, Brittany, France

Oldest recorded age at locality: 290
Youngest recorded age at locality: 210

mindat Locality ID: 155615
mindat URL: http://www.mindat.org/loc-155615.html

Tectonic Settings:

Total number of sublocalities beneath "Guern, Morbihan, Brittany, France": 11
Total number of bottom-level sublocalities: 11

Number of Child Localities: 11
Child Localities:
Bieuzy
Coat Henven (Coët Henven)
Guermeur
Guern Pitchblende Vein
Kerroc'h
Kervegan
Locrio
Mané Er Val
Mané Tanguy
Montguern
Quistiav (Quistiave)

Latitude: 48°1'13"N
Longitude: 3°6'23"W
Decimal Degree (lat, lon): 48.020277777778,-3.1063888888889

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.

Acanthite	Amorphous	Aragonite	Arsenic	Arsenopyrite	Autunite	Baryte	Bournonite	Chalcopyrite	Chalcostibite
Clay	Coquimbite	Corundum	Covellite	Cubanite	Diaspore	Digenite	Fluorite	Johannite	Kieserite
Kobellite	Marcasite	Meneghinite	Meta-autunite	Natroautunite	Nickeline	None	Not in a structural group	Phosphuranylite	Polybasite
Pyrite	Quartz	Rhabdophane	Rocksalt	Schoepite	Smectite-vermiculite	Sphalerite	Spinel	Stannite	Stibnite
Wurtzite	Zircon

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 Ba Bi C Ca Ce Cu Fe H K Mg Na Ni O P Pb S Sb Se Si Sn U Zn

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Acanthite Amorphous Aragonite Arsenic Arsenopyrite Autunite Baryte Bournonite Chalcopyrite Chalcostibite
Clay Coquimbite Corundum Covellite Cubanite Diaspore Digenite Fluorite Johannite Kieserite
Kobellite Marcasite Meneghinite Meta-autunite Natroautunite Nickeline None Not in a structural group Phosphuranylite Polybasite
Pyrite Quartz Rhabdophane Rocksalt Schoepite Smectite-vermiculite Sphalerite Spinel Stannite Stibnite
Wurtzite Zircon

57 IMA Minerals at location:

Acanthite ()*	Aikinite ()*	Anglesite ()*	Arsenopyrite ()*	Autunite ()*
Bassetite ()*	Bismuth ()*	Bismuthinite ()*	Bournonite ()*	Cerussite ()*
Chalcopyrite ()*	Chernikovite ()*	Coffinite ()*	Cosalite ()*	Covellite ()*
Cubanite ()*	Curite ()*	Dewindtite ()*	Digenite ()*	Emplectite ()*
Fourmarierite ()*	Galena ()*	Goethite ()*	Greigite ()*	Hematite ()*
Johannite ()*	Kasolite ()*	Kobellite ()*	Mackinawite ()*	Marcasite ()*
Matildite ()*	Meta-autunite ()*	Metatorbernite ()*	Metauranocircite-I ()*	Montmorillonite ()*
Naumannite ()*	Ningyoite ()*	Opal ()*	Paracoquimbite ()*	Parsonsite ()*
Pearceite ()*	Phosphuranylite ()*	Pyrite ()*	Pyrrhotite ()*	Quartz ()*
Renardite ()*	Sabugalite ()*	Sklodowskite ()*	Sphalerite ()*	Stannite ()*
Szomolnokite ()*	Torbernite ()*	Uraninite ()*	Uranocircite-II ()*	Uranophane-α ()*
Uranopilite ()*	Uranosphaerite ()*

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
Acanthite ()*	Acanthite	Ag₂S	290	210	1	53299	2793
Aikinite ()*	Meneghinite	CuPbBiS₃	230	210	1	53299	315
Anglesite ()*	Baryte	Pb(SO₄)	230	210	1	53299	2734
Arsenopyrite ()*	Arsenopyrite	FeAsS	290	210	2	53297,53299	9052
Autunite ()*	Autunite	Ca(UO₂)₂(PO₄)₂·10-12H₂O	290	270	5	53290,53291,53293,53295,53299	1272
Bassetite ()*	None	Fe²⁺(UO₂)₂(PO₄)₂(H₂O)₁₀	290	270	1	53299	51
Bismuth ()*	Arsenic	Bi	290	210	1	53299	1966
Bismuthinite ()*	Stibnite	Bi₂S₃	290	210	1	53299	1935
Bournonite ()*	Bournonite	CuPbSbS₃	230	210	1	53299	1089
Cerussite ()*	Aragonite	Pb(CO₃)			1	53297	4979
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	290	210	4	53291,53293,53297,53299	27198
Chernikovite ()*	Natroautunite	(H₃O)(UO₂)(PO₄)·3H₂O	290	270	1	53299	21
Coffinite ()*	Zircon	U(SiO₄)·nH₂O	290	270	2	53293,53299	566
Cosalite ()*	None	Pb₂Bi₂S₅	230	210	1	53299	344
Covellite ()*	Covellite	CuS	290	210	2	53297,53299	4165
Cubanite ()*	Cubanite Wurtzite	CuFe₂S₃	290	210	1	53299	802
Curite ()*	None	Pb_3+x[(UO₂)₄O_4+x(OH)_3-x]₂·2H₂O	290	210	1	53299	51
Dewindtite ()*	Phosphuranylite	H₂Pb₃(UO₂)₆O₄(PO₄)₄·12H₂O	290	210	3	53291,53295,53299	82
Digenite ()*	Digenite	Cu_1.8S	290	210	1	53299	1027
Emplectite ()*	Chalcostibite	CuBiS₂	290	210	1	53299	246
Fourmarierite ()*	Schoepite	Pb_1-xO_3-2x(UO₂)₄(OH)_4+2x·4H₂O	290	210	1	53299	61
Galena ()*	Rocksalt	PbS	230	210	6	53289,53293,53295,53296,53297,53299	24243
Goethite ()*	Diaspore	FeO(OH)	290	210	2	53293,53299	7437
Greigite ()*	Spinel	Fe²⁺Fe³⁺₂S₄	290	210	1	53299	62
Hematite ()*	Corundum	Fe₂O₃	290	210	2	53293,53299	14640
Johannite ()*	Johannite	Cu(UO₂)₂(SO₄)₂(OH)₂·8H₂O	290	270	1	53299	69
Kasolite ()*	None	Pb(UO₂)(SiO₄)·H₂O	290	210	1	53299	198
Kobellite ()*	Kobellite	Pb₁₁(Cu,Fe)₂(Bi,Sb)₁₅S₃₅	230	210	1	53299	87
Mackinawite ()*	None	(Fe,Ni)_1+xS (x = 0-0.07)	290	210	1	53299	451
Marcasite ()*	Marcasite	FeS₂	290	210	4	53291,53293,53297,53299	5674
Matildite ()*	None	AgBiS₂	290	210	1	53299	252
Meta-autunite ()*	Meta-autunite	Ca(UO₂)₂(PO₄)₂·6H₂O	290	270	1	53299	388
Metatorbernite ()*	None	Cu(UO₂)₂(PO₄)₂·8H₂O	290	270	1	53299	443
Metauranocircite-I ()*	None	Ba(UO₂)₂(PO₄)₂·6H₂O	290	270	1	53299	38
Montmorillonite ()*	Clay Smectite-vermiculite	(Na,Ca)_0.3(Al,Mg)₂Si₄O₁₀(OH)₂·nH₂O			1	53293	1508
Naumannite ()*	Not in a structural group	Ag₂Se	290	210	1	53299	192
Ningyoite ()*	Rhabdophane	(U,Ca,Ce)₂(PO₄)₂·1-2H₂O			1	53293	33
Opal ()*	Amorphous	SiO₂·nH₂O	290	210	1	53299	2994
Paracoquimbite ()*	Coquimbite	Fe³⁺₄(SO₄)₆(H₂O)₁₂·6H₂O	290	210	1	53299	30
Parsonsite ()*	None	Pb₂(UO₂)(PO₄)₂	290	210	1	53299	63
Pearceite ()*	Polybasite	[Ag₉CuS₄][(Ag,Cu)₆(As,Sb)₂S₇]	290	210	1	53299	249
Phosphuranylite ()*	Phosphuranylite	KCa(H₃O)₃(UO₂)₇(PO₄)₄O₄·8H₂O	290	270	1	53299	182
Pyrite ()*	Pyrite	FeS₂	290	210	5	53290,53291,53293,53297,53299	39462
Pyrrhotite ()*	Nickeline	Fe₇S₈	290	210	2	53297,53299	9056
Quartz ()*	Quartz	SiO₂	290	210	8	53289,53291,53292,53293,53295,53296,53297,53299	61156
Renardite ()*	None	Pb(UO₂)₄(PO₄)₂(OH)₄·7H₂O	290	210	1	53299	7
Sabugalite ()*	None	HAl(UO₂)₄(PO₄)₄·16H₂O	290	270	2	53293,53299	87
Sklodowskite ()*	None	Mg(UO₂)₂(SiO₃OH)₂·6H₂O	290	270	1	53299	56
Sphalerite ()*	Sphalerite	ZnS	230	210	5	53293,53295,53296,53297,53299	21482
Stannite ()*	Stannite Sphalerite	Cu₂FeSnS₄	290	210	1	53299	668
Szomolnokite ()*	Kieserite	Fe(SO₄)·H₂O			1	53293	139
Torbernite ()*	None	Cu(UO₂)₂(PO₄)₂·12H₂O	290	270	2	53291,53299	1059
Uraninite ()*	Fluorite	UO₂	290	270	6	53290,53291,53292,53293,53294,53299	2718
Uranocircite-II ()*	None	Ba(UO₂)₂(PO₄)₂·10H₂O	290	270	3	53291,53294,53299	89
Uranophane-α ()*	None	Ca(UO₂)₂(SiO₃OH)₂·5H₂O	290	270	2	53291,53299	890
Uranopilite ()*	None	(UO₂)₆(SO₄)O₂(OH)₆·14H₂O	290	270	1	53299	94
Uranosphaerite ()*	None	Bi(UO₂)O₂(OH)			1	53294	18

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Giersdorf_00000655	The Quistiav locality is found within the Pontivy region of France. It is responsible for producing 400 tons of Uranium metal. Uranium in the Pontivy district is usually found intragranitic, the granite is cut by a system of transverse mineralized fractures, preferentially located on the northern part of the Massif. It is within the fractures that the Uranium can be found.
Giersdorf_00000655a	The Quistiav locality is found within the Pontivy region of France. It is responsible for producing 400 tons of Uranium metal. Uranium in the Pontivy district is usually found intragranitic, the granite is cut by a system of transverse mineralized fractures, preferentially located on the northern part of the Massif. It is within the fractures that the Uranium can be found.

2 Ages assigned to this locality:

	Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Source	Sample Num	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	Giersdorf_00000655	290	270	290-270	U-Pb	The age of mineralization being post-cooling of the 300-340 Ma granite bodies restricts the formation of the Uranium minerals to being genetically derived.								U	1726	Quistiav (Quistiave), Guern, Morbihan, Brittany, France	Quistiav	Chauris et al. (1994)		PMGFRA_243	Age of the uranium mineralization in the Armorican Massif is associated with Hercynian peraluminous granites. From pg. 262: "The precise chronology of these mineralizations is not well established. The uranium veins appear to be the oldest (290-270 Ma by U/Pb dating) but underwent late remobilization processes."
	Giersdorf_00000655a	230	210	230-210	K-Ar	The age of mineralization being post-cooling of the 300-340 Ma granite bodies restricts the formation of the Uranium minerals to being genetically derived.								Pb, Zn	1726	Quistiav (Quistiave), Guern, Morbihan, Brittany, France	Quistiav	Chauris et al. (1994)		PMGFRA_243	from pg 262: "The lead-zinc veins (230-210 Ma, K-Ar dating) seem to be the youngest and the antimony veins are of intermediate age"

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...