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Ambatofotsy pegmatite, Mahavelona Commune, Soavinandriana District, Itasy Region, Antananarivo Province, Madagascar

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Name(s) in local language(s):Ambatofotsy, Kaominin'i Mahavelona, Distrikan'i Soavinandriana, Faritra Itasy, Faritanin' Antananarivo, Madagasikara
Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 19° South , 46° East (est.)
Margin of Error:~12km
Locality type:Pegmatite
Köppen climate type:Cwb : Subtropical highland climate or temperate oceanic climate with dry winters


A granite LCT pegmatite, subtype Beryl-Columbite-Uranium that is famous for producing very large betafites. One of the largest crystal groups weighed 104 kg!

It is located 18 km W of the town Soavinandriana in the central highland of Madagascar (Besaire 1966, see Map in Behier 1963). The pegmatite dike is irregular, 300m long and 30-40 m wide. The pegmatite with a typical large quartz core is hosted in an intensely lateritized gneiss with distinct N-S foliation. It is the most important uraniferous pegmatite in the Kitsamby-Antsirabe pegmatite district.

Formerly operated and owned by the Compagnie Lyonnaise de Madagascar with a production of about 20 tons of betafite. It was worked before WW1. In 1948 the Commissariat à l'Énergie Atomique (CEA) reopened the mine. A total of 23,500kg of euxenite and betafite were mined here (production from 50,000 tons of pegmatite mined).

Approximate coordinates for the area (to be checked): 19°10'S 46°33'E

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Standard Detailed Strunz Dana Chemical Elements

Commodity List

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


Mineral List


15 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and 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:

Aeschynite-(Y)
Formula: (Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
Description: Described as "priorite"
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
Albite
Formula: Na(AlSi3O8)
Reference: Besairie H. (1966): Les Gites Minéraux de Madagascar. Annales Géologiques de Madagascar, Tananarive, 34: 389-390
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: Besairie H. (1966): Les Gites Minéraux de Madagascar. Annales Géologiques de Madagascar, Tananarive, 34: 389-390
Anatase
Formula: TiO2
Description: Variety xanthitane. Found as microscopic crystals in pseudomorphs after titanite.
Reference: Lacroix, A. (1915): Sur le sphène malgache et sur ses pseudomorphoses. Bulletin de la Société française de minéralogie. 38, 21-24; Behier, J. (1960): Contribution á la mineralogie de Madagascar. Annales Géologiques de Madagascar XXIX, Tananarive, p. 15
Anatase var: Xanthitane
Formula: TiO2
Reference: Lacroix, A. (1915): Sur le sphène malgache et sur ses pseudomorphoses. Bulletin de la Société française de minéralogie. 38, 21-24
Beryl
Formula: Be3Al2(Si6O18)
Reference: Besairie H. (1966): Les Gites Minéraux de Madagascar. Annales Géologiques de Madagascar, Tananarive, 34: 389-390
'Biotite'
Reference: Besairie H. (1966): Les Gites Minéraux de Madagascar. Annales Géologiques de Madagascar, Tananarive, 34: 389-390
Bismuthinite
Formula: Bi2S3
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
Bismutite
Formula: (BiO)2CO3
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
'Columbite-(Fe)-Columbite-(Mn) Series'
Reference: Lacroix, A. (1923): Mineralogie de Madagascar, Tome III. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. p. 309.
'Feldspar Group'
Description: Giant crystals of perthite measuring 190 x 50m (!)has been observed here
Reference: Besairie H. (1966): Les Gites Minéraux de Madagascar. Annales Géologiques de Madagascar, Tananarive, 34, 92p [p 390]
'Feldspar Group var: Perthite'
Description: Giant crystals of perthite measuring 190 x 50m (!)has been observed here
Reference: Besairie H. (1966): Les Gites Minéraux de Madagascar. Annales Géologiques de Madagascar, Tananarive, 34: 389-390
Fergusonite-(Y)
Formula: YNbO4
Reference: [www.johnbetts-fineminerals.com]
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Bourret, W.(1988): Uranium-bearing pegmatites of the Antsirabe-Kitsamby district, Madagascar. Ore Geology Reviews: 3(1-3): 177-191.
'Gneiss'
Reference: Bourret, W. (1988): Uranium-bearing pegmatites of the Antsirabe-Kitsamby district, Madagascar. Ore Geology Reviews: 3(1-3): 177-191.
'Laterite'
Reference: Bourret, W. (1988): Uranium-bearing pegmatites of the Antsirabe-Kitsamby district, Madagascar. Ore Geology Reviews: 3(1-3): 177-191.
Microcline
Formula: K(AlSi3O8)
Colour: Pale salmon-pink
Reference: Besairie H. (1966): Les Gites Minéraux de Madagascar. Annales Géologiques de Madagascar, Tananarive, 34: 389-390
'Pegmatite'
Reference: Bourret, W. (1988): Uranium-bearing pegmatites of the Antsirabe-Kitsamby district, Madagascar. Ore Geology Reviews: 3(1-3): 177-191.
'Pyrochlore Supergroup'
Formula: A2-mD2X6-wZ1-n
Description: The betafites occurs in pockets in biotite
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
'Pyrochlore Supergroup var: Betafite (of Hogarth 1977)'
Formula: A2-mD2X6-wZ1+w
Description: The betafites occurs in pockets in biotite
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
Quartz
Formula: SiO2
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
Quartz var: Amethyst
Formula: SiO2
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
Quartz var: Smoky Quartz
Formula: SiO2
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
Rutile
Formula: TiO2
Description: As pseudomorphs after titanite. The pseudomorphs consists (in parts) of microscopic rutile crystals
Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. p 222, 582
Thorite
Formula: Th(SiO4)
Description: The variety "uranothorite" occurs here
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
Thorite var: Orangite
Formula: Th(SiO4)
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871 :Lacroix, A. (1923): Mineralogie de Madagascar, Tome III. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. p. 309.
Thorite var: Uranothorite
Formula: (Th,U)SiO4
Reference: Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. p. 243
Titanite
Formula: CaTi(SiO4)O
Description: Described as "Sphene". Also pseudomorphs after sphene crystals (up to 5 cm large)
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871; Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. 624p (p.582)
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Bourret, W.(1988): Uranium-bearing pegmatites of the Antsirabe-Kitsamby district, Madagascar. Ore Geology Reviews: 3(1-3): 177-191.
'commodity:Uranium'
Formula: U
Reference:  
Vermiculite
Formula: Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Reference: Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
Xenotime-(Y)
Formula: Y(PO4)
Reference: Knut Edvard Larsen collection # MM-1319
Zircon
Formula: Zr(SiO4)
Reference: Behier, J. (1963): Carte minéralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
Zircon var: Malacon
Formula: Zr(SiO4)
Reference: Behier, J. (1963): Carte minéralogique de Madagascar. Archive Service Géologique Madagascar. A 1871

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Bismuthinite'2.DB.05Bi2S3
Group 4 - Oxides and Hydroxides
'Aeschynite-(Y)'4.DF.05(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
Anatase4.DD.05TiO2
var: Xanthitane4.DD.05TiO2
'Quartz'4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
'Rutile'4.DB.05TiO2
Group 5 - Nitrates and Carbonates
'Bismutite'5.BE.25(BiO)2CO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Fergusonite-(Y)'7.GA.05YNbO4
Group 8 - Phosphates, Arsenates and Vanadates
Xenotime-(Y)8.AD.35Y(PO4)
Group 9 - Silicates
'Albite'9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Beryl9.CJ.05Be3Al2(Si6O18)
Microcline9.FA.30K(AlSi3O8)
Thorite9.AD.30Th(SiO4)
var: Orangite9.AD.30Th(SiO4)
var: Uranothorite9.AD.30(Th,U)SiO4
Titanite9.AG.15CaTi(SiO4)O
Vermiculite9.EC.50Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Zircon9.AD.30Zr(SiO4)
var: Malacon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Biotite'-
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Feldspar Group'-
'var: Perthite'-
'Garnet Group'-X3Z2(SiO4)3
'Gneiss'-
'Laterite'-
Pegmatite-
'Pyrochlore Supergroup'-A2-mD2X6-wZ1-n
'var: Betafite (of Hogarth 1977)'-A2-mD2X6-wZ1+w
Tourmaline-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:3
Bismuthinite2.11.2.3Bi2S3
Group 4 - SIMPLE OXIDES
AX2
Anatase4.4.4.1TiO2
Rutile4.4.1.1TiO2
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
Fergusonite-(Y)8.1.1.1YNbO4
A2B2O6(O,OH,F)
'Pyrochlore Supergroup
var: Betafite (of Hogarth 1977)'
8.2.3.1A2-mD2X6-wZ1+w
AB2O6
Aeschynite-(Y)8.3.6.3(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Bismutite16a.3.5.1(BiO)2CO3
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Thorite51.5.2.3Th(SiO4)
Zircon51.5.2.1Zr(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Vermiculite71.2.2d.3Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Rocks, etc.
Albite
var: Oligoclase
-(Na,Ca)[Al(Si,Al)Si2O8]
Anatase
var: Xanthitane
-TiO2
'Biotite'-
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Feldspar Group'-
'var: Perthite'-
'Garnet Group'-X3Z2(SiO4)3
'Gneiss'-
'Laterite'-
'Pegmatite'-
'Pyrochlore Supergroup'-A2-mD2X6-wZ1-n
Quartz
var: Amethyst
-SiO2
var: Smoky Quartz-SiO2
Thorite
var: Orangite
-Th(SiO4)
var: Uranothorite-(Th,U)SiO4
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
Xenotime-(Y)-Y(PO4)
Zircon
var: Malacon
-Zr(SiO4)

List of minerals for each chemical element

HHydrogen
H Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
H VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
BeBeryllium
Be BerylBe3Al2(Si6O18)
BBoron
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
CCarbon
C Bismutite(BiO)2CO3
OOxygen
O Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
O AlbiteNa(AlSi3O8)
O Quartz (var: Amethyst)SiO2
O AnataseTiO2
O BerylBe3Al2(Si6O18)
O Bismutite(BiO)2CO3
O Fergusonite-(Y)YNbO4
O Garnet GroupX3Z2(SiO4)3
O Zircon (var: Malacon)Zr(SiO4)
O MicroclineK(AlSi3O8)
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O Thorite (var: Orangite)Th(SiO4)
O QuartzSiO2
O RutileTiO2
O Quartz (var: Smoky Quartz)SiO2
O ThoriteTh(SiO4)
O TitaniteCaTi(SiO4)O
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O Thorite (var: Uranothorite)(Th,U)SiO4
O VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
O Anatase (var: Xanthitane)TiO2
O Xenotime-(Y)Y(PO4)
O ZirconZr(SiO4)
NaSodium
Na AlbiteNa(AlSi3O8)
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
MgMagnesium
Mg VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
AlAluminium
Al AlbiteNa(AlSi3O8)
Al BerylBe3Al2(Si6O18)
Al MicroclineK(AlSi3O8)
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
SiSilicon
Si AlbiteNa(AlSi3O8)
Si Quartz (var: Amethyst)SiO2
Si BerylBe3Al2(Si6O18)
Si Garnet GroupX3Z2(SiO4)3
Si Zircon (var: Malacon)Zr(SiO4)
Si MicroclineK(AlSi3O8)
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si Thorite (var: Orangite)Th(SiO4)
Si QuartzSiO2
Si Quartz (var: Smoky Quartz)SiO2
Si ThoriteTh(SiO4)
Si TitaniteCaTi(SiO4)O
Si Thorite (var: Uranothorite)(Th,U)SiO4
Si VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Si ZirconZr(SiO4)
PPhosphorus
P Xenotime-(Y)Y(PO4)
SSulfur
S BismuthiniteBi2S3
KPotassium
K MicroclineK(AlSi3O8)
CaCalcium
Ca Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Ca TitaniteCaTi(SiO4)O
TiTitanium
Ti Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
Ti AnataseTiO2
Ti RutileTiO2
Ti TitaniteCaTi(SiO4)O
Ti Anatase (var: Xanthitane)TiO2
FeIron
Fe VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
YYttrium
Y Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
Y Fergusonite-(Y)YNbO4
Y Xenotime-(Y)Y(PO4)
ZrZirconium
Zr Zircon (var: Malacon)Zr(SiO4)
Zr ZirconZr(SiO4)
NbNiobium
Nb Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
Nb Fergusonite-(Y)YNbO4
BiBismuth
Bi BismuthiniteBi2S3
Bi Bismutite(BiO)2CO3
ThThorium
Th Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
Th Thorite (var: Orangite)Th(SiO4)
Th ThoriteTh(SiO4)
Th Thorite (var: Uranothorite)(Th,U)SiO4
UUranium
U Thorite (var: Uranothorite)(Th,U)SiO4

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Lacroix, A. (1915) Sur le sphène malgache et sur ses pseudomorphoses. Bulletin de la Société française de minéralogie, 38, 21-24.
Lacroix, A. (1922) Minéralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. pp. 379-381.
Behier, J. (1963) Carte minéralogique de Madagascar. Archive Service Géologique Madagascar. A 1871.
Besairie, H. (1966) Les Gites Minéraux de Madagascar. Annales Géologiques de Madagascar, 34, 389-390.
Bourret, W. (1988) Uranium-bearing pegmatites of the Antsirabe-Kitsamby district, Madagascar. Ore Geology Reviews, 3(1-3), 177-191.


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