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Le Semnon, Martigné-Ferchaud, Fougères-Vitré, Ille-et-Vilaine, Brittany, Francei
Regional Level Types
Le SemnonMine (Abandoned)
Martigné-FerchaudCommune
Fougères-VitréArrondissement
Ille-et-VilaineDepartment
BrittanyRegion
FranceCountry

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Latitude & Longitude (WGS84):
47° 50' 28'' North , 1° 21' 10'' West
Latitude & Longitude (decimal):
47.84137,-1.35292
GeoHash:
G#: gbx01jqb4
GRN:
N32W01
Type:
Mine (Abandoned) - last checked 2020
Köppen climate type:
Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
Martigné-Ferchaud2,619 (2016)2.9km
Forges-la-Forêt269 (2016)5.7km
Fercé559 (2016)7.0km
Noyal-sur-Brutz529 (2016)7.4km
Coësmes1,168 (2016)8.0km
Mindat Locality ID:
42784
Long-form identifier:
mindat:1:2:42784:8
GUID (UUID V4):
64906ef6-96fc-44c2-9396-6cc8a117114f


"Southeast of Rennes on the D163 until Corps-Nuds. Take the D41 until Retiers and follow the D94. In the Le Semnon mine and its dumps one will encounter (gold-bearing) arsenopyrite." [Belot, 1978]

Old antimony mine which yielded 500 metric tonnes of antimony between 1895 and 1918.
Later, small quantities of gold were mined, after recognition of its presence in the ore.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


27 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Allophane
Formula: (Al2O3)(SiO2)1.3-2 · 2.5-3H2O
ⓘ Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
ⓘ Antimony
Formula: Sb
ⓘ 'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
ⓘ Arsenopyrite
Formula: FeAsS
ⓘ Aurostibite
Formula: AuSb2
ⓘ Berthierite
Formula: FeSb2S4
ⓘ Bournonite
Formula: PbCuSbS3
ⓘ Calcite
Formula: CaCO3
Colour: white, brown, grey
Description: Few automorphes crystals in quartz geodes with stibnite.
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ Chalcostibite
Formula: CuSbS2
ⓘ 'Chlorite Group'
ⓘ Goethite
Formula: α-Fe3+O(OH)
ⓘ Gold
Formula: Au
ⓘ Graphite
Formula: C
ⓘ Hematite
Formula: Fe2O3
ⓘ Ilmenite
Formula: Fe2+TiO3
ⓘ Kermesite
Formula: Sb2S2O
ⓘ Lepidocrocite
Formula: γ-Fe3+O(OH)
ⓘ 'Leucoxene'
ⓘ 'Limonite'
ⓘ Marcasite
Formula: FeS2
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Muscovite var. Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
ⓘ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrrhotite
Formula: Fe1-xS
ⓘ Quartz
Formula: SiO2
ⓘ Rutile
Formula: TiO2
ⓘ Sphalerite
Formula: ZnS
ⓘ Stibnite
Formula: Sb2S3
ⓘ 'Tetrahedrite Subgroup'
Formula: Cu6(Cu4C2+2)Sb4S12S
ⓘ Ullmannite
Formula: NiSbS
ⓘ Valentinite
Formula: Sb2O3

Gallery:

FeAsSⓘ Arsenopyrite
Sb2S3ⓘ Stibnite

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘGold1.AA.05Au
ⓘAntimony1.CA.05Sb
ⓘGraphite1.CB.05aC
Group 2 - Sulphides and Sulfosalts
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘStibnite2.DB.05Sb2S3
ⓘAurostibite2.EB.05aAuSb2
ⓘPyrite2.EB.05aFeS2
ⓘMarcasite2.EB.10aFeS2
ⓘArsenopyrite2.EB.20FeAsS
ⓘUllmannite2.EB.25NiSbS
ⓘKermesite2.FD.05Sb2S2O
ⓘBournonite2.GA.50PbCuSbS3
ⓘ'Tetrahedrite Subgroup'2.GB.05Cu6(Cu4C2+2)Sb4S12S
ⓘChalcostibite2.HA.05CuSbS2
ⓘBerthierite2.HA.20FeSb2S4
Group 4 - Oxides and Hydroxides
ⓘGoethite4.00.α-Fe3+O(OH)
ⓘIlmenite4.CB.05Fe2+TiO3
ⓘHematite4.CB.05Fe2O3
ⓘValentinite4.CB.55Sb2O3
ⓘQuartz4.DA.05SiO2
ⓘRutile4.DB.05TiO2
ⓘLepidocrocite4.FE.15γ-Fe3+O(OH)
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘAnkerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Group 9 - Silicates
ⓘMuscovite
var. Illite		9.EC.15K0.65Al2.0[Al0.65Si3.35O10](OH)2
ⓘ9.EC.15KAl2(AlSi3O10)(OH)2
ⓘAllophane9.ED.20(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Unclassified
ⓘ'Limonite'-
ⓘ'Chlorite Group'-
ⓘ'Leucoxene'-
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'Apatite'-Ca5(PO4)3(Cl/F/OH)

List of minerals for each chemical element

HHydrogen
Hⓘ Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Hⓘ Goethiteα-Fe3+O(OH)
Hⓘ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Hⓘ Lepidocrociteγ-Fe3+O(OH)
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ ApatiteCa5(PO4)3(Cl/F/OH)
CCarbon
Cⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Cⓘ CalciteCaCO3
Cⓘ GraphiteC
OOxygen
Oⓘ Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Oⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Oⓘ CalciteCaCO3
Oⓘ Goethiteα-Fe3+O(OH)
Oⓘ HematiteFe2O3
Oⓘ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Oⓘ IlmeniteFe2+TiO3
Oⓘ KermesiteSb2S2O
Oⓘ Lepidocrociteγ-Fe3+O(OH)
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ QuartzSiO2
Oⓘ RutileTiO2
Oⓘ ValentiniteSb2O3
Oⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oⓘ ApatiteCa5(PO4)3(Cl/F/OH)
FFluorine
Fⓘ ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Naⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
AlAluminium
Alⓘ Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Alⓘ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Siⓘ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ QuartzSiO2
Siⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
PPhosphorus
Pⓘ ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
Sⓘ ArsenopyriteFeAsS
Sⓘ BerthieriteFeSb2S4
Sⓘ BournonitePbCuSbS3
Sⓘ ChalcopyriteCuFeS2
Sⓘ ChalcostibiteCuSbS2
Sⓘ KermesiteSb2S2O
Sⓘ MarcasiteFeS2
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
Sⓘ SphaleriteZnS
Sⓘ StibniteSb2S3
Sⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
Sⓘ UllmanniteNiSbS
ClChlorine
Clⓘ ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
Kⓘ Muscovite var. IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Caⓘ CalciteCaCO3
Caⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Caⓘ ApatiteCa5(PO4)3(Cl/F/OH)
TiTitanium
Tiⓘ IlmeniteFe2+TiO3
Tiⓘ RutileTiO2
FeIron
Feⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Feⓘ ArsenopyriteFeAsS
Feⓘ BerthieriteFeSb2S4
Feⓘ ChalcopyriteCuFeS2
Feⓘ Goethiteα-Fe3+O(OH)
Feⓘ HematiteFe2O3
Feⓘ IlmeniteFe2+TiO3
Feⓘ Lepidocrociteγ-Fe3+O(OH)
Feⓘ MarcasiteFeS2
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
NiNickel
Niⓘ UllmanniteNiSbS
CuCopper
Cuⓘ BournonitePbCuSbS3
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ ChalcostibiteCuSbS2
Cuⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
ZnZinc
Znⓘ SphaleriteZnS
AsArsenic
Asⓘ ArsenopyriteFeAsS
SbAntimony
Sbⓘ AntimonySb
Sbⓘ AurostibiteAuSb2
Sbⓘ BerthieriteFeSb2S4
Sbⓘ BournonitePbCuSbS3
Sbⓘ ChalcostibiteCuSbS2
Sbⓘ KermesiteSb2S2O
Sbⓘ StibniteSb2S3
Sbⓘ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
Sbⓘ UllmanniteNiSbS
Sbⓘ ValentiniteSb2O3
AuGold
Auⓘ AurostibiteAuSb2
Auⓘ GoldAu
PbLead
Pbⓘ BournonitePbCuSbS3

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate
EuropeContinent

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

patrimoine.bzh (n.d.) http://patrimoine.bzh/gertrude-diffusion/dossier/mine-d-antimoine-du-semnon/7519b56f-76c4-4cdc-8b3b-353f9cd9ee2a
www.ville-martigneferchaud.fr (n.d.) http://www.ville-martigneferchaud.fr/FCKeditor/UserFiles/La-Mine-d-or-a-MF.pdf
Belot, Victor R. (1978) Guide des minéraux, coquillages et fossiles: où les trouver en France, comment les reconnaître et les collectionner. Guides Horay.
Lukas, Yann (1978) Roches et minéraux de Bretagne. Editions Ouest-France, 33 pp. [p. 15.]
Pillard, F., Chauris, L., and Laforêt, C. (1985) Inventaire minéralogique de la France, 13, 106-111. Ed. B.R.G.M.
Pochon, A., Gloaguen, E., Branquet, Y., Poujol, M., Ruffet, G., Boiron, M.-C., Boulvais, P., Gumiaux, C., Cagnard, F., Guazou, F., and Gapais, D. (2018) Variscan Sb-Au mineralization in Central Brittany (France): A new metallogenic model derived from the Le Semnon district. Ore Geology Reviews, 97, 109-142.
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