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 plumbian uranpyrochlore.

Regions containing this locality

Somali Plate (Somalia Plate)	Tectonic Plate
Antananarivo Province, Madagascar	Province (Abolished)

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

22 valid minerals.

Detailed Mineral List:

ⓘ Beryl

Formula: Be₃Al₂(Si₆O₁₈)

Colour: blue, yellow, green

Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. 624p

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg)([Si/Al]Si₂O₁₀)(OH/F)₂

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Bismite

Formula: Bi₂O₃

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Bismuth

Formula: Bi

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

Bismuthinite, etc.

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar

ⓘ Bismuthinite

Formula: Bi₂S₃

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Bismutite

Formula: (BiO)₂CO₃

Reference: Michel Arliguie specimen

ⓘ Columbite-(Fe)

Formula: Fe²⁺Nb₂O₆

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de doctorat de L'Universite Paul Sabatier, Toulouse

ⓘ Dravite

Formula: Na(Mg₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

Euxenite-(Y)

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar

ⓘ Euxenite-(Y)

Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Goethite

Formula: α-Fe³⁺O(OH)

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Hematite

Formula: Fe₂O₃

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Monazite-(Ce)

Formula: Ce(PO₄)

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ 'Psilomelane'

Formula: Mn, O

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Pucherite

Formula: Bi(VO₄)

Habit: as crust on bismite

Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. p 156

ⓘ 'Pyrochlore Group'

Formula: A₂Nb₂(O,OH)₆Z

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Pyromorphite

Formula: Pb₅(PO₄)₃Cl

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Quartz

Formula: SiO₂

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Quartz var: Rose Quartz

Formula: SiO₂

Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. p 199

ⓘ Rutile

Formula: TiO₂

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Rutile var: Ilmenorutile

Formula: Fe_x(Nb,Ta)_2x · 4Ti_1-xO₂

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

Strüverite

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar

ⓘ Rutile var: Strüverite

Formula: (Ti,Ta,Fe)O₂

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Samarskite-(Y)

Formula: YFe³⁺Nb₂O₈

Reference: Knut Edvard Larsen collection # MM-2248 (visually identification)

ⓘ Schorl

Formula: Na(Fe²⁺₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ Spessartine

Formula: Mn²⁺₃Al₂(SiO₄)₃

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

ⓘ 'Uranpyrochlore (of Hogarth 1977)'

Formula: (Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)

Reference: Bull. Soc. franc.Mineral. 35 (1912), pp 84-92/ A.Lacroix: (1922) Mineralogie de Madagascar I ,p 283

Samiresite, etc.

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar

ⓘ 'Uranpyrochlore (of Hogarth 1977) var: Samiresite'

Formula: (U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)

Reference: Bull. Soc. franc.Mineral. 35 (1912), pp 84-92/ A.Lacroix: (1922) Mineralogie de Madagascar I ,p 283

ⓘ Xenotime-(Y)

Formula: Y(PO₄)

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

Zircon

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar

ⓘ Zircon

Formula: Zr(SiO₄)

Reference: Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Bismuth	1.CA.05	Bi
Group 2 - Sulphides and Sulfosalts
ⓘ	Bismuthinite	2.DB.05	Bi₂S₃
Group 4 - Oxides and Hydroxides
ⓘ	Bismite	4.CB.60	Bi₂O₃
ⓘ	Columbite-(Fe)	4.DB.35	Fe²⁺Nb₂O₆
ⓘ	Euxenite-(Y)	4.DG.05	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
ⓘ	Goethite	4.00.	α-Fe³⁺O(OH)
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	'Pyrochlore Group'	4.00.	A₂Nb₂(O,OH)₆Z
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	var: Rose Quartz	4.DA.05	SiO₂
ⓘ	Rutile	4.DB.05	TiO₂
ⓘ	var: Ilmenorutile	4.DB.05	Fe_x(Nb,Ta)_2x · 4Ti_1-xO₂
ⓘ	var: Strüverite	4.DB.05	(Ti,Ta,Fe)O₂
ⓘ	Samarskite-(Y)	4.DB.25	YFe³⁺Nb₂O₈
ⓘ	'Uranpyrochlore (of Hogarth 1977)'	4.DH.15	(Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)
ⓘ	'var: Samiresite'	4.DH.15	(U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)
Group 5 - Nitrates and Carbonates
ⓘ	Bismutite	5.BE.25	(BiO)₂CO₃
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Monazite-(Ce)	8.AD.50	Ce(PO₄)
ⓘ	Pucherite	8.AD.40	Bi(VO₄)
ⓘ	Pyromorphite	8.BN.05	Pb₅(PO₄)₃Cl
ⓘ	Xenotime-(Y)	8.AD.35	Y(PO₄)
Group 9 - Silicates
ⓘ	Beryl	9.CJ.05	Be₃Al₂(Si₆O₁₈)
ⓘ	Dravite	9.CK.05	Na(Mg₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
ⓘ	Muscovite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Schorl	9.CK.05	Na(Fe²⁺₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
ⓘ	Spessartine	9.AD.25	Mn²⁺₃Al₂(SiO₄)₃
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
Unclassified Minerals, Rocks, etc.
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg)([Si/Al]Si₂O₁₀)(OH/F)₂
ⓘ	'Psilomelane'	-	Mn, O

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
ⓘ	Bismuth	1.3.1.4	Bi
Group 2 - SULFIDES
A_mB_nX_p, with (m+n):p = 2:3
ⓘ	Bismuthinite	2.11.2.3	Bi₂S₃
Group 4 - SIMPLE OXIDES
A₂X₃
ⓘ	Bismite	4.3.10.2	Bi₂O₃
ⓘ	Hematite	4.3.1.2	Fe₂O₃
AX₂
ⓘ	Rutile	4.4.1.1	TiO₂
ⓘ	var: Ilmenorutile	4.4.1.2	Fe_x(Nb,Ta)_2x · 4Ti_1-xO₂
ⓘ	var: Strüverite	4.4.1.3	(Ti,Ta,Fe)O₂
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
ⓘ	Goethite	6.1.1.2	α-Fe³⁺O(OH)
Group 7 - MULTIPLE OXIDES
AB₂X₄
ⓘ	Magnetite	7.2.2.3	Fe²⁺Fe³⁺₂O₄
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO₄
ⓘ	Samarskite-(Y)	8.1.11.1	YFe³⁺Nb₂O₈
A₂B₂O₆(O,OH,F)
ⓘ	'Pyrochlore Group'	8.2.1.1	A₂Nb₂(O,OH)₆Z
ⓘ	'Uranpyrochlore (of Hogarth 1977)'	8.2.1.7	(Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)
AB₂O₆
ⓘ	Columbite-(Fe)	8.3.2.2	Fe²⁺Nb₂O₆
ⓘ	Euxenite-(Y)	8.3.8.2	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
ⓘ	Bismutite	16a.3.5.1	(BiO)₂CO₃
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
AXO₄
ⓘ	Monazite-(Ce)	38.4.3.1	Ce(PO₄)
ⓘ	Pucherite	38.4.6.1	Bi(VO₄)
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A₅(XO₄)₃Z_q
ⓘ	Pyromorphite	41.8.4.1	Pb₅(PO₄)₃Cl
Group 51 - NESOSILICATES Insular SiO₄ Groups Only
Insular SiO₄ Groups Only with cations in [6] and >[6] coordination
ⓘ	Spessartine	51.4.3a.3	Mn²⁺₃Al₂(SiO₄)₃
Insular SiO₄ Groups Only with cations in >[6] coordination
ⓘ	Zircon	51.5.2.1	Zr(SiO₄)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si₆O₁₈] rings; possible (OH) and Al substitution
ⓘ	Beryl	61.1.1.1	Be₃Al₂(Si₆O₁₈)
Six-Membered Rings with borate groups
ⓘ	Dravite	61.3.1.9	Na(Mg₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
ⓘ	Schorl	61.3.1.10	Na(Fe²⁺₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
ⓘ	Muscovite	71.2.2a.1	KAl₂(AlSi₃O₁₀)(OH)₂
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO₂ with [4] coordinated Si
ⓘ	Quartz	75.1.3.1	SiO₂
Unclassified Minerals, Mixtures, etc.
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg)([Si/Al]Si₂O₁₀)(OH/F)₂
ⓘ	'Psilomelane'	-	Mn, O
ⓘ	Quartz var: Rose Quartz	-	SiO₂
ⓘ	'Uranpyrochlore (of Hogarth 1977) var: Samiresite'	-	(U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)
ⓘ	Xenotime-(Y)	-	Y(PO₄)

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)	(U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)
H	ⓘ Schorl	Na(Fe₃²⁺)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg)([Si/Al]Si₂O₁₀)(OH/F)₂
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Dravite	Na(Mg₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
H	ⓘ Goethite	α-Fe³⁺O(OH)
H	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
H	ⓘ Uranpyrochlore (of Hogarth 1977)	(Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)
Be	Beryllium
Be	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
B	Boron
B	ⓘ Schorl	Na(Fe₃²⁺)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
B	ⓘ Dravite	Na(Mg₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
C	Carbon
C	ⓘ Bismutite	(BiO)₂CO₃
O	Oxygen
O	ⓘ Quartz	SiO₂
O	ⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)	(U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)
O	ⓘ Quartz (var: Rose Quartz)	SiO₂
O	ⓘ Schorl	Na(Fe₃²⁺)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg)([Si/Al]Si₂O₁₀)(OH/F)₂
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Spessartine	Mn₃²⁺Al₂(SiO₄)₃
O	ⓘ Dravite	Na(Mg₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Xenotime-(Y)	Y(PO₄)
O	ⓘ Monazite-(Ce)	Ce(PO₄)
O	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
O	ⓘ Rutile (var: Ilmenorutile)	Fe_x(Nb,Ta)_2x · 4Ti_1-xO₂
O	ⓘ Rutile (var: Strüverite)	(Ti,Ta,Fe)O₂
O	ⓘ Pyromorphite	Pb₅(PO₄)₃Cl
O	ⓘ Bismite	Bi₂O₃
O	ⓘ Goethite	α-Fe³⁺O(OH)
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Psilomelane	Mn, O
O	ⓘ Pucherite	Bi(VO₄)
O	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
O	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
O	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
O	ⓘ Bismutite	(BiO)₂CO₃
O	ⓘ Samarskite-(Y)	YFe³⁺Nb₂O₈
O	ⓘ Uranpyrochlore (of Hogarth 1977)	(Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)
O	ⓘ Rutile	TiO₂
F	Fluorine
F	ⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)	(U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg)([Si/Al]Si₂O₁₀)(OH/F)₂
F	ⓘ Uranpyrochlore (of Hogarth 1977)	(Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)
Na	Sodium
Na	ⓘ Schorl	Na(Fe₃²⁺)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Na	ⓘ Dravite	Na(Mg₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Mg	Magnesium
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg)([Si/Al]Si₂O₁₀)(OH/F)₂
Mg	ⓘ Dravite	Na(Mg₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Al	Aluminium
Al	ⓘ Schorl	Na(Fe₃²⁺)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg)([Si/Al]Si₂O₁₀)(OH/F)₂
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Spessartine	Mn₃²⁺Al₂(SiO₄)₃
Al	ⓘ Dravite	Na(Mg₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Al	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
Si	Silicon
Si	ⓘ Quartz	SiO₂
Si	ⓘ Quartz (var: Rose Quartz)	SiO₂
Si	ⓘ Schorl	Na(Fe₃²⁺)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg)([Si/Al]Si₂O₁₀)(OH/F)₂
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Spessartine	Mn₃²⁺Al₂(SiO₄)₃
Si	ⓘ Dravite	Na(Mg₃)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
P	Phosphorus
P	ⓘ Xenotime-(Y)	Y(PO₄)
P	ⓘ Monazite-(Ce)	Ce(PO₄)
P	ⓘ Pyromorphite	Pb₅(PO₄)₃Cl
S	Sulfur
S	ⓘ Bismuthinite	Bi₂S₃
Cl	Chlorine
Cl	ⓘ Pyromorphite	Pb₅(PO₄)₃Cl
K	Potassium
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg)([Si/Al]Si₂O₁₀)(OH/F)₂
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)	(U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)
Ca	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Ca	ⓘ Uranpyrochlore (of Hogarth 1977)	(Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)
Ti	Titanium
Ti	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Ti	ⓘ Rutile (var: Ilmenorutile)	Fe_x(Nb,Ta)_2x · 4Ti_1-xO₂
Ti	ⓘ Rutile (var: Strüverite)	(Ti,Ta,Fe)O₂
Ti	ⓘ Uranpyrochlore (of Hogarth 1977)	(Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)
Ti	ⓘ Rutile	TiO₂
V	Vanadium
V	ⓘ Pucherite	Bi(VO₄)
Mn	Manganese
Mn	ⓘ Spessartine	Mn₃²⁺Al₂(SiO₄)₃
Mn	ⓘ Psilomelane	Mn, O
Fe	Iron
Fe	ⓘ Schorl	Na(Fe₃²⁺)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg)([Si/Al]Si₂O₁₀)(OH/F)₂
Fe	ⓘ Rutile (var: Ilmenorutile)	Fe_x(Nb,Ta)_2x · 4Ti_1-xO₂
Fe	ⓘ Rutile (var: Strüverite)	(Ti,Ta,Fe)O₂
Fe	ⓘ Goethite	α-Fe³⁺O(OH)
Fe	ⓘ Hematite	Fe₂O₃
Fe	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
Fe	ⓘ Samarskite-(Y)	YFe³⁺Nb₂O₈
Y	Yttrium
Y	ⓘ Xenotime-(Y)	Y(PO₄)
Y	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Y	ⓘ Samarskite-(Y)	YFe³⁺Nb₂O₈
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Nb	Niobium
Nb	ⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)	(U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)
Nb	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Nb	ⓘ Rutile (var: Ilmenorutile)	Fe_x(Nb,Ta)_2x · 4Ti_1-xO₂
Nb	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
Nb	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
Nb	ⓘ Samarskite-(Y)	YFe³⁺Nb₂O₈
Nb	ⓘ Uranpyrochlore (of Hogarth 1977)	(Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)
Ce	Cerium
Ce	ⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)	(U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)
Ce	ⓘ Monazite-(Ce)	Ce(PO₄)
Ce	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Ce	ⓘ Uranpyrochlore (of Hogarth 1977)	(Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)
Ta	Tantalum
Ta	ⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)	(U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)
Ta	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Ta	ⓘ Rutile (var: Ilmenorutile)	Fe_x(Nb,Ta)_2x · 4Ti_1-xO₂
Ta	ⓘ Rutile (var: Strüverite)	(Ti,Ta,Fe)O₂
Ta	ⓘ Uranpyrochlore (of Hogarth 1977)	(Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)
Pb	Lead
Pb	ⓘ Pyromorphite	Pb₅(PO₄)₃Cl
Bi	Bismuth
Bi	ⓘ Bismuth	Bi
Bi	ⓘ Bismite	Bi₂O₃
Bi	ⓘ Bismuthinite	Bi₂S₃
Bi	ⓘ Pucherite	Bi(VO₄)
Bi	ⓘ Bismutite	(BiO)₂CO₃
Th	Thorium
Th	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
U	Uranium
U	ⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)	(U,Ca,Ce)₂(Nb,Ta)₂O₆(OH,F)
U	ⓘ Euxenite-(Y)	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
U	ⓘ Uranpyrochlore (of Hogarth 1977)	(Ca,U,Ce)₂(Nb,Ti,Ta)₂O₆(OH,F)

Geochronology

Mineralization age: Tonian : 915 ± 72 Ma

Important note: This table is based only on rock and mineral ages recorded below 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 Time

Rocks, Minerals and Events

915 ± 72 Ma

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cambrian - Neoproterozoic 485.4 - 1000 Ma ID: 3306770	Age: Neoproterozoic to Cambrian (485.4 - 1000 Ma) Lithology: Plutonic Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]
Ectasian - Calymmian 1200 - 1600 Ma ID: 3184647	Mesoproterozoic crystalline metamorphic rocks Age: Mesoproterozoic (1200 - 1600 Ma) Lithology: Crystalline metamorphic rocks Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)

Lacroix, A. (1922) Minéralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. 624 p.

Ranorosoa, N. (1986) Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar. Thèse de Doctorat de l'Université Paul Sabatier, Toulouse.

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Samiresy, Tritriva, Betafo, Vakinankaratra, MadagascariRegional Level TypesSamiresy- not defined - TritrivaCommune BetafoDistrict VakinankaratraRegion MadagascarCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Mineral List

Detailed Mineral List:

List of minerals arranged by Strunz 10th Edition classification

List of minerals arranged by Dana 8th Edition classification

List of minerals for each chemical element

Geochronology

Regional Geology

References

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Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar i
Regional Level Types
Samiresy - not defined -
Tritriva Commune
Betafo District
Vakinankaratra Region
Madagascar Country