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Samiresy, Tritriva, Betafo District, Vakinankaratra, Madagascari
Regional Level Types
SamiresyGroup ofDikes
TritrivaCommune
Betafo DistrictDistrict
VakinankaratraRegion
MadagascarCountry

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Latitude & Longitude (WGS84):
19° 58' 9'' South , 46° 52' 53'' East
Latitude & Longitude (decimal):
-19.96943,46.88141
GeoHash:
G#:mh3q6udj8
GRN:
S14E31
Type:
Group ofDikes
Köppen climate type:
Cwb : Subtropical highland climate or temperate oceanic climate with dry winters
Nearest Settlements:
PlacePopulationDistance
Betafo29,785(2018)15.5km
Antsirabe186,253(2018)19.6km
Soanindrariny21,000(2018)37.6km
Antanifotsy70,626(2018)57.7km
Mindat Locality ID:
2261
Long-form identifier:
mindat:1:2:2261:6
GUID (UUID V4):
473676df-5a8f-4495-8359-623fe5bf4188
Other Languages:
Malagasy:
Samiresy, Kaominin'i Tritriva, Distrikan'i Betafo, Vakinankaratra, Madagasikara


The locality Samiresy covers a number of pegmatite dikes (classified as potassic pegmatites after A. Lacroix 1922) worked for minerals containing U, beryl and rose quartz.

It is located SW of Tritriva and about 20 km SW of the town Antsirabe in the main highland of Madagascar.

One of these dikes is the type locality of the now discredited "samiresite", a zero valent dominant member of the Pyrochlore Group.

Select Mineral List Type

StandardDetailedGalleryStrunzChemical Elements

Detailed Mineral List:

ⓘBeryl
Formula:Be3Al2(Si6O18)
Colour: blue, yellow, green
ⓘ'Biotite'
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘBismite
Formula:Bi2O3
ⓘBismuth
Formula:Bi
ⓘBismuthinite
Formula:Bi2S3
ⓘBismutite
Formula:(BiO)2CO3
ⓘColumbite-(Fe)
Formula:Fe2+Nb2O6
ⓘDravite
Formula:NaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘEuxenite-(Y)
Formula:(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
ⓘGoethite
Formula:α-Fe3+O(OH)
ⓘHematite
Formula:Fe2O3
ⓘMagnetite
Formula:Fe2+Fe3+2O4
ⓘMonazite-(Ce)
Formula:Ce(PO4)
ⓘMuscovite
Formula:KAl2(AlSi3O10)(OH)2
ⓘ'Psilomelane'
ⓘPucherite
Formula:Bi(VO4)
Habit: as crust on bismite
ⓘ'Pyrochlore Group'
Formula:A2Nb2(O,OH)6Z
ⓘ'Pyrochlore Group var. Samiresite'
Formula:(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)
ⓘ'Pyrochlore Group var. Uranpyrochlore (of Hogarth 1977)'
Formula:(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
Description: Samiresite was described and named by Lacroix (1912) as a betafite with a content of Pb. Samiresite was later discredited by IMA in 1977 (Hogarth 1977) as a plumbian uranpyrochlore. Uranopyrochlore was later discredited by IMA 2010 due to inadequate modern analysis (Atencio et al. 2010). Samiresite belongs to the zero-valent-dominant pyrochlores.
ⓘPyromorphite
Formula:Pb5(PO4)3Cl
ⓘQuartz
Formula:SiO2
ⓘQuartz var. Rose Quartz
Formula:SiO2
ⓘRutile
Formula:TiO2
ⓘRutile var. Ilmenorutile
Formula:(Ti,Nb)O2
ⓘRutile var. Strüverite
Formula:(Ti,Ta,Fe)O2
ⓘSamarskite-(Y)
Formula:YFe3+Nb2O8
ⓘSchorl
Formula:NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘSpessartine
Formula:Mn2+3Al2(SiO4)3
ⓘXenotime-(Y)
Formula:Y(PO4)
ⓘZircon
Formula:Zr(SiO4)

Gallery:

(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6ⓘEuxenite-(Y)
(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)ⓘ'Pyrochlore Group var. Samiresite'
(Ti,Ta,Fe)O2ⓘRutile var. Strüverite

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘBismuth1.CA.05Bi
Group 2 - Sulphides and Sulfosalts
ⓘBismuthinite2.DB.05Bi2S3
Group 4 - Oxides and Hydroxides
ⓘGoethite4.00.α-Fe3+O(OH)
ⓘ'Pyrochlore Group'4.00.A2Nb2(O,OH)6Z
ⓘ'var. Samiresite'4.00.(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)
ⓘ'var. Uranpyrochlore (of Hogarth 1977)'4.00.(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘHematite4.CB.05Fe2O3
ⓘBismite4.CB.60Bi2O3
ⓘQuartz4.DA.05SiO2
ⓘvar. Rose Quartz4.DA.05SiO2
ⓘRutile
var. Ilmenorutile		4.DB.05(Ti,Nb)O2
ⓘ4.DB.05TiO2
ⓘvar. Strüverite4.DB.05(Ti,Ta,Fe)O2
ⓘSamarskite-(Y)4.DB.25YFe3+Nb2O8
ⓘColumbite-(Fe)4.DB.35Fe2+Nb2O6
ⓘEuxenite-(Y)4.DG.05(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Group 5 - Nitrates and Carbonates
ⓘBismutite5.BE.25(BiO)2CO3
Group 8 - Phosphates, Arsenates and Vanadates
ⓘXenotime-(Y)8.AD.35Y(PO4)
ⓘPucherite8.AD.40Bi(VO4)
ⓘMonazite-(Ce)8.AD.50Ce(PO4)
ⓘPyromorphite8.BN.05Pb5(PO4)3Cl
Group 9 - Silicates
ⓘSpessartine9.AD.25Mn2+3Al2(SiO4)3
ⓘZircon9.AD.30Zr(SiO4)
ⓘBeryl9.CJ.05Be3Al2(Si6O18)
ⓘDravite9.CK.05NaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘSchorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Psilomelane'-

List of minerals for each chemical element

HHydrogen
HⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
HⓘDraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
HⓘGoethiteα-Fe3+O(OH)
HⓘMuscoviteKAl2(AlSi3O10)(OH)2
HⓘPyrochlore GroupA2Nb2(O,OH)6Z
HⓘPyrochlore Group var.Samiresite(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)
HⓘSchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
HⓘPyrochlore Group var.Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
BeBeryllium
BeⓘBerylBe3Al2(Si6O18)
BBoron
BⓘDraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
BⓘSchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
CCarbon
CⓘBismutite(BiO)2CO3
OOxygen
OⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
OⓘBismiteBi2O3
OⓘBismutite(BiO)2CO3
OⓘBerylBe3Al2(Si6O18)
OⓘDraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
OⓘEuxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
OⓘColumbite-(Fe)Fe2+Nb2O6
OⓘGoethiteα-Fe3+O(OH)
OⓘHematiteFe2O3
OⓘRutile var.Ilmenorutile(Ti,Nb)O2
OⓘMagnetiteFe2+Fe23+O4
OⓘMonazite-(Ce)Ce(PO4)
OⓘMuscoviteKAl2(AlSi3O10)(OH)2
OⓘPucheriteBi(VO4)
OⓘPyrochlore GroupA2Nb2(O,OH)6Z
OⓘPyromorphitePb5(PO4)3Cl
OⓘQuartzSiO2
OⓘQuartz var.Rose QuartzSiO2
OⓘRutileTiO2
OⓘSamarskite-(Y)YFe3+Nb2O8
OⓘPyrochlore Group var.Samiresite(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)
OⓘSchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
OⓘSpessartineMn32+Al2(SiO4)3
OⓘRutile var.Strüverite(Ti,Ta,Fe)O2
OⓘPyrochlore Group var.Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
OⓘXenotime-(Y)Y(PO4)
OⓘZirconZr(SiO4)
FFluorine
FⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FⓘPyrochlore Group var.Samiresite(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)
FⓘPyrochlore Group var.Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
NaSodium
NaⓘDraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
NaⓘSchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
MgⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
MgⓘDraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
AlⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlⓘBerylBe3Al2(Si6O18)
AlⓘDraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
AlⓘMuscoviteKAl2(AlSi3O10)(OH)2
AlⓘSchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
AlⓘSpessartineMn32+Al2(SiO4)3
SiSilicon
SiⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
SiⓘBerylBe3Al2(Si6O18)
SiⓘDraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
SiⓘMuscoviteKAl2(AlSi3O10)(OH)2
SiⓘQuartzSiO2
SiⓘQuartz var.Rose QuartzSiO2
SiⓘSchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
SiⓘSpessartineMn32+Al2(SiO4)3
SiⓘZirconZr(SiO4)
PPhosphorus
PⓘMonazite-(Ce)Ce(PO4)
PⓘPyromorphitePb5(PO4)3Cl
PⓘXenotime-(Y)Y(PO4)
SSulfur
SⓘBismuthiniteBi2S3
ClChlorine
ClⓘPyromorphitePb5(PO4)3Cl
KPotassium
KⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
KⓘMuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
CaⓘEuxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
CaⓘPyrochlore Group var.Samiresite(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)
CaⓘPyrochlore Group var.Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
TiTitanium
TiⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
TiⓘEuxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
TiⓘRutile var.Ilmenorutile(Ti,Nb)O2
TiⓘRutileTiO2
TiⓘRutile var.Strüverite(Ti,Ta,Fe)O2
TiⓘPyrochlore Group var.Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
VVanadium
VⓘPucheriteBi(VO4)
MnManganese
MnⓘSpessartineMn32+Al2(SiO4)3
FeIron
FeⓘBiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeⓘColumbite-(Fe)Fe2+Nb2O6
FeⓘGoethiteα-Fe3+O(OH)
FeⓘHematiteFe2O3
FeⓘMagnetiteFe2+Fe23+O4
FeⓘSamarskite-(Y)YFe3+Nb2O8
FeⓘSchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
FeⓘRutile var.Strüverite(Ti,Ta,Fe)O2
YYttrium
YⓘEuxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
YⓘSamarskite-(Y)YFe3+Nb2O8
YⓘXenotime-(Y)Y(PO4)
ZrZirconium
ZrⓘZirconZr(SiO4)
NbNiobium
NbⓘEuxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
NbⓘColumbite-(Fe)Fe2+Nb2O6
NbⓘRutile var.Ilmenorutile(Ti,Nb)O2
NbⓘPyrochlore GroupA2Nb2(O,OH)6Z
NbⓘSamarskite-(Y)YFe3+Nb2O8
NbⓘPyrochlore Group var.Samiresite(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)
NbⓘPyrochlore Group var.Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
CeCerium
CeⓘEuxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
CeⓘMonazite-(Ce)Ce(PO4)
CeⓘPyrochlore Group var.Samiresite(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)
CeⓘPyrochlore Group var.Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
TaTantalum
TaⓘEuxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
TaⓘPyrochlore Group var.Samiresite(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)
TaⓘRutile var.Strüverite(Ti,Ta,Fe)O2
TaⓘPyrochlore Group var.Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
PbLead
PbⓘPyromorphitePb5(PO4)3Cl
PbⓘPyrochlore Group var.Samiresite(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)
BiBismuth
BiⓘBismiteBi2O3
BiⓘBismuthBi
BiⓘBismuthiniteBi2S3
BiⓘBismutite(BiO)2CO3
BiⓘPucheriteBi(VO4)
ThThorium
ThⓘEuxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
UUranium
UⓘEuxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
UⓘPyrochlore Group var.Samiresite(U,Ca,Ce,Pb)2(Nb,Ta)2O6(OH,F)
UⓘPyrochlore Group var.Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)

Geochronology

Mineralization age:Neoproterozoic : 915 ± 72 Ma

Important note: This table is based only on rock and mineral ages recorded on mindat.org for this locality and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
Precambrian
 Proterozoic
  Neoproterozoic
   Tonian
ⓘ Samiresite915 ± 72 Ma

Other Regions, Features and Areas containing this locality

African Plate
Madagascar
Madagascar
Somali PlateTectonic Plate

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, pleaseregister so you can add to our database. This locality information is for reference purposes only. You should never attempt tovisit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holdersfor access and that you are aware of all safety precautions necessary.

References

Lacroix, Alfred (1922) Minéralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. Augustin Challamel, Paris. p.1-624.
Ranorosoa, Nadine (1986) Thèse de doctorat de L'Université Paul Sabatier, Toulouse.Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar, 1-240
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