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Befanamo pegmatite, Beronono, Anjozorobe District, Analamanga, Madagascari
Regional Level Types
Befanamo pegmatitePegmatite
BerononoCommune
Anjozorobe DistrictDistrict
AnalamangaRegion
MadagascarCountry

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PhotosMapsSearch
02545820015026400673189.jpg
Befanamite

Befanamo pegmatite, Beronono, Anjozorobe District, Analamanga, Madagascar
07387740015170635144947.jpg
Thortveitite

Befanamo pegmatite, Beronono, Anjozorobe District, Analamanga, Madagascar
08190890014961787142879.jpg
Bastnäsite

Befanamo pegmatite, Beronono, Anjozorobe District, Analamanga, Madagascar
04786910014947195541794.jpg
Befanamite

Befanamo pegmatite, Beronono, Anjozorobe District, Analamanga, Madagascar
04913770014966871278596.jpg
Befanamite

Befanamo pegmatite, Beronono, Anjozorobe District, Analamanga, Madagascar
06468820014966871272071.jpg
Thortveitite

Befanamo pegmatite, Beronono, Anjozorobe District, Analamanga, Madagascar
08190890014961787142879.jpg
Bastnäsite

Befanamo pegmatite, Beronono, Anjozorobe District, Analamanga, Madagascar
04786910014947195541794.jpg
Befanamite

Befanamo pegmatite, Beronono, Anjozorobe District, Analamanga, Madagascar
08664110014949347349747.jpg
Befanamite

Befanamo pegmatite, Beronono, Anjozorobe District, Analamanga, Madagascar
03474070014949347344660.jpg
Thortveitite

Befanamo pegmatite, Beronono, Anjozorobe District, Analamanga, Madagascar
Type:
Pegmatite
Mindat Locality ID:
2263
Long-form identifier:
mindat:1:2:2263:0
GUID (UUID V4):
771e032b-134d-463e-9dbb-d43aa7b54845
Other Languages:
Malagasy:
Befanamo, Kaominin'i Beronono, Distrikan' Anjozorobe, Faritr' Analamanga, Madagasikara


A granite NYF pegmatite, monazite-thortveitite subtype that is hosted in an amphibolite-gneiss (a partially decomposed fine-grained biotite gneiss). It is situated 2 km W of the village Ambalabako, about 20 NW of Ambatomanoina, about 40 km ENE of Ankazobe and about 80 km N of the capital Antananarivo.
The map coordinates given by Guigues (1955) are X= 876.9 and Y= 510.7.

This scandium-rich pegmatite has produced more than 40 kg of "befanamite" (a variety of thortveitite rich in Sc and Zr and low in Y) since its discovery in 1918. It was first discovered in the eluvials of the pegmatite in 1918 by the prospector J.B. Rasamoel and later described by the French mineralogist Alfred Lacroix. In 1952 the same prospector, J.B. Rasamoel, started prospecting for befanamite (Concession PE 10050, which in the early 1950s was sold to the USA). By 1960 the mineralogist J. Behier believed the locality to be exhausted.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


20 valid minerals. 1 (TL) - type locality of valid minerals. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc.

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:

ⓘ 'Bastnäsite'
Formula: (Ce/Nd/Y/REE)(CO3)F
ⓘ Beryl
Formula: Be3Al2(Si6O18)
Colour: green, colorless, blue
Description: Crystals 5-10cm in length, but up to 20 cm has been reported (Guigues 1955)
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Columbite-(Fe)
Formula: Fe2+Nb2O6
ⓘ 'Columbite-Tantalite'
ⓘ Euxenite-(Y)
Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
ⓘ 'Feldspar Group'
ⓘ 'Feldspar Group var. Perthite'
ⓘ Fergusonite-(Y)
Formula: YNbO4
ⓘ Hematite
Formula: Fe2O3
ⓘ Ilmenite
Formula: Fe2+TiO3
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
Description: masses to 2cm in diameter
ⓘ Microcline
Formula: K(AlSi3O8)
ⓘ 'Monazite'
Formula: REE(PO4)
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Muscovite var. Gilbertite
Formula: KAl2(AlSi3O10)(OH)2
Description: small scales on microcline
ⓘ Nioboheftetjernite (TL)
Formula: ScNbO4
Type Locality:
ⓘ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
ⓘ Quartz
Formula: SiO2
ⓘ Quartz var. Smoky Quartz
Formula: SiO2
ⓘ Rossovskyite
Formula: (Fe3+,Ta)(Nb,Ti)O4
ⓘ Rutile
Formula: TiO2
ⓘ Rutile var. Strüverite
Formula: (Ti,Ta,Fe)O2
ⓘ Samarskite-(Y)
Formula: YFe3+Nb2O8
Description: variety ampangabeite
ⓘ Schorl
Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘ Spessartine
Formula: Mn2+3Al2(SiO4)3
Description: 1,5-3 cm large typically altered
ⓘ Thortveitite
Formula: Sc2Si2O7
Description: Described as the variety befanamite
ⓘ Thortveitite var. Befanamite (FRL)
Formula: Sc2Si2O7
Type Locality:
Description: The largest crystal found weighed 450 gram. Found as groups of parallellgrowing crystals mostly embedded in quartz, but it has been observed together with strüverite, monazite and beryl. Small crystals of green thortveitite has been observed on monazite crystals.
ⓘ 'Tourmaline'
Formula: AD3G6 (T6O18)(BO3)3X3Z
ⓘ Vermiculite
Formula: Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
ⓘ Xenotime-(Y)
Formula: Y(PO4)
Description: In groups with zircon
ⓘ Zircon
Formula: Zr(SiO4)
ⓘ Zircon var. Malacon
Formula: Zr(SiO4)

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘHematite4.CB.05Fe2O3
ⓘIlmenite4.CB.05Fe2+TiO3
ⓘQuartz
var. Smoky Quartz		4.DA.05SiO2
ⓘ4.DA.05SiO2
ⓘNioboheftetjernite (TL)4.DB.ScNbO4
ⓘRutile
var. Strüverite		4.DB.05(Ti,Ta,Fe)O2
ⓘ4.DB.05TiO2
ⓘSamarskite-(Y)4.DB.25YFe3+Nb2O8
ⓘRossovskyite4.DB.30(Fe3+,Ta)(Nb,Ti)O4
ⓘColumbite-(Fe)4.DB.35Fe2+Nb2O6
ⓘEuxenite-(Y)4.DG.05(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
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
ⓘSpessartine9.AD.25Mn2+3Al2(SiO4)3
ⓘZircon
var. Malacon		9.AD.30Zr(SiO4)
ⓘ9.AD.30Zr(SiO4)
ⓘThortveitite9.BC.05Sc2Si2O7
ⓘvar. Befanamite (TL)9.BC.05Sc2Si2O7
ⓘBeryl9.CJ.05Be3Al2(Si6O18)
ⓘSchorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘMuscovite
var. Gilbertite		9.EC.15KAl2(AlSi3O10)(OH)2
ⓘ9.EC.15KAl2(AlSi3O10)(OH)2
ⓘVermiculite9.EC.50Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
ⓘMicrocline9.FA.30K(AlSi3O8)
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Tourmaline'-AD3G6 (T6O18)(BO3)3X3Z
ⓘ'Feldspar Group'-
ⓘ'var. Perthite'-
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'Columbite-Tantalite'-
ⓘ'Monazite'-REE(PO4)
ⓘ'Bastnäsite'-(Ce/Nd/Y/REE)(CO3)F

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ⓘ Muscovite var. GilbertiteKAl2(AlSi3O10)(OH)2
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Hⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
BeBeryllium
Beⓘ BerylBe3Al2(Si6O18)
BBoron
Bⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Bⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
CCarbon
Cⓘ Bastnäsite(Ce/Nd/Y/REE)(CO3)F
OOxygen
Oⓘ Bastnäsite(Ce/Nd/Y/REE)(CO3)F
Oⓘ Thortveitite var. BefanamiteSc2Si2O7
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ BerylBe3Al2(Si6O18)
Oⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Oⓘ Fergusonite-(Y)YNbO4
Oⓘ Columbite-(Fe)Fe2+Nb2O6
Oⓘ Muscovite var. GilbertiteKAl2(AlSi3O10)(OH)2
Oⓘ HematiteFe2O3
Oⓘ IlmeniteFe2+TiO3
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MicroclineK(AlSi3O8)
Oⓘ MonaziteREE(PO4)
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ QuartzSiO2
Oⓘ RutileTiO2
Oⓘ Samarskite-(Y)YFe3+Nb2O8
Oⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Oⓘ Quartz var. Smoky QuartzSiO2
Oⓘ SpessartineMn32+Al2(SiO4)3
Oⓘ Rutile var. Strüverite(Ti,Ta,Fe)O2
Oⓘ ThortveititeSc2Si2O7
Oⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
Oⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Oⓘ Xenotime-(Y)Y(PO4)
Oⓘ ZirconZr(SiO4)
Oⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oⓘ Zircon var. MalaconZr(SiO4)
Oⓘ Rossovskyite(Fe3+,Ta)(Nb,Ti)O4
Oⓘ NioboheftetjerniteScNbO4
FFluorine
Fⓘ Bastnäsite(Ce/Nd/Y/REE)(CO3)F
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
NaSodium
Naⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Naⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
AlAluminium
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ BerylBe3Al2(Si6O18)
Alⓘ Muscovite var. GilbertiteKAl2(AlSi3O10)(OH)2
Alⓘ MicroclineK(AlSi3O8)
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Alⓘ SpessartineMn32+Al2(SiO4)3
Alⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Alⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ Thortveitite var. BefanamiteSc2Si2O7
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ BerylBe3Al2(Si6O18)
Siⓘ Muscovite var. GilbertiteKAl2(AlSi3O10)(OH)2
Siⓘ MicroclineK(AlSi3O8)
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ QuartzSiO2
Siⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Siⓘ Quartz var. Smoky QuartzSiO2
Siⓘ SpessartineMn32+Al2(SiO4)3
Siⓘ ThortveititeSc2Si2O7
Siⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Siⓘ ZirconZr(SiO4)
Siⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Siⓘ Zircon var. MalaconZr(SiO4)
PPhosphorus
Pⓘ MonaziteREE(PO4)
Pⓘ Xenotime-(Y)Y(PO4)
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ Muscovite var. GilbertiteKAl2(AlSi3O10)(OH)2
Kⓘ MicroclineK(AlSi3O8)
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Caⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
ScScandium
Scⓘ Thortveitite var. BefanamiteSc2Si2O7
Scⓘ ThortveititeSc2Si2O7
Scⓘ NioboheftetjerniteScNbO4
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ⓘ IlmeniteFe2+TiO3
Tiⓘ RutileTiO2
Tiⓘ Rutile var. Strüverite(Ti,Ta,Fe)O2
Tiⓘ Rossovskyite(Fe3+,Ta)(Nb,Ti)O4
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ⓘ HematiteFe2O3
Feⓘ IlmeniteFe2+TiO3
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
Feⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Feⓘ Rossovskyite(Fe3+,Ta)(Nb,Ti)O4
YYttrium
Yⓘ Bastnäsite(Ce/Nd/Y/REE)(CO3)F
Yⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Yⓘ Fergusonite-(Y)YNbO4
Yⓘ Samarskite-(Y)YFe3+Nb2O8
Yⓘ Xenotime-(Y)Y(PO4)
ZrZirconium
Zrⓘ ZirconZr(SiO4)
Zrⓘ Zircon var. MalaconZr(SiO4)
NbNiobium
Nbⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Nbⓘ Fergusonite-(Y)YNbO4
Nbⓘ Columbite-(Fe)Fe2+Nb2O6
Nbⓘ Samarskite-(Y)YFe3+Nb2O8
Nbⓘ Rossovskyite(Fe3+,Ta)(Nb,Ti)O4
Nbⓘ NioboheftetjerniteScNbO4
CeCerium
Ceⓘ Bastnäsite(Ce/Nd/Y/REE)(CO3)F
Ceⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
NdNeodymium
Ndⓘ Bastnäsite(Ce/Nd/Y/REE)(CO3)F
TaTantalum
Taⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Taⓘ Rutile var. Strüverite(Ti,Ta,Fe)O2
Taⓘ Rossovskyite(Fe3+,Ta)(Nb,Ti)O4
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

Other Regions, Features and Areas containing this locality

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, 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

Guigues, J. (1955) Étude des gisements de pegmatite de Madagascar (Deuxième partie) Travaux du Bureau Gèologique de Madagascar 67. Haut Commisariat de Madagascar et dependancespp.6-8
Behier, Jean (1960) Contribution à la minéralogie de Madagascar. Annales géologiques de Madagascar Vol. 29. République Malgachepp.19-20 - on befanamite
Pezzotta, Federico (1999) Madagaskar. Das Paradies der Mineralien und Edelsteine. extraLapis 17. Christian Weise Verlagpp.44-46 - a short notice
Lykova, Inna, Rowe, Ralph, Poirier, Glenn, McDonald, Andrew M., Giester, Gerald (2021) Nioboheftetjernite, ScNbO4, a new mineral from the Befanamo Pegmatite, Madagascar. The Canadian Mineralogist, 59 (2) 445-452 doi:10.3749/canmin.2000070
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