Befanamo pegmatite, Beronono Commune, Anjozorobe District, Analamanga, Madagascari
| Regional Level Types | |
|---|---|
| Befanamo pegmatite | Pegmatite (Extinct) |
| Beronono Commune | Commune |
| Anjozorobe District | District |
| Analamanga | Region |
| Madagascar | Country |
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Type:
Pegmatite (Extinct) - last checked 2024
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 km 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.
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Standard Detailed Gallery Strunz Chemical ElementsMineral 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!
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Alphabetical List Tree DiagramDetailed 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 References: |
| ⓘ 'Columbite-Tantalite' |
| ⓘ Euxenite-(Y) Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 |
| ⓘ 'Feldspar Group' |
| ⓘ 'Feldspar Group var. Perthite' References: |
| ⓘ 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 Group' 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 | |||
|---|---|---|---|
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | var. Smoky Quartz | 4.DA.05 | SiO2 |
| ⓘ | Nioboheftetjernite (TL) | 4.DB. | ScNbO4 |
| ⓘ | Rutile | 4.DB.05 | TiO2 |
| ⓘ | var. Strüverite | 4.DB.05 | (Ti,Ta,Fe)O2 |
| ⓘ | Samarskite-(Y) | 4.DB.25 | YFe3+Nb2O8 |
| ⓘ | Rossovskyite | 4.DB.30 | (Fe3+,Ta)(Nb,Ti)O4 |
| ⓘ | Columbite-(Fe) | 4.DB.35 | Fe2+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.05 | YNbO4 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Xenotime-(Y) | 8.AD.35 | Y(PO4) |
| Group 9 - Silicates | |||
| ⓘ | Spessartine | 9.AD.25 | Mn2+3Al2(SiO4)3 |
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
| ⓘ | var. Malacon | 9.AD.30 | Zr(SiO4) |
| ⓘ | Thortveitite var. Befanamite (TL) | 9.BC.05 | Sc2Si2O7 |
| ⓘ | 9.BC.05 | Sc2Si2O7 | |
| ⓘ | Beryl | 9.CJ.05 | Be3Al2(Si6O18) |
| ⓘ | Schorl | 9.CK.05 | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ | Muscovite var. Gilbertite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | 9.EC.15 | KAl2(AlSi3O10)(OH)2 | |
| ⓘ | Vermiculite | 9.EC.50 | Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O |
| ⓘ | Microcline | 9.FA.30 | K(AlSi3O8) |
| Unclassified | |||
| ⓘ | 'Bastnäsite' | - | (Ce/Nd/Y/REE)(CO3)F |
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'Monazite Group' | - | REE(PO4) |
| ⓘ | 'Tourmaline' | - | AD3G6(T6O18)(BO3)3X3Z |
| ⓘ | 'Feldspar Group var. Perthite' | - | |
| ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ | 'Columbite-Tantalite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| H | ⓘ Muscovite var. Gilbertite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| H | ⓘ Vermiculite | Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O |
| Be | Beryllium | |
| Be | ⓘ Beryl | Be3Al2(Si6O18) |
| B | Boron | |
| B | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| B | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| C | Carbon | |
| C | ⓘ Bastnäsite | (Ce/Nd/Y/REE)(CO3)F |
| O | Oxygen | |
| O | ⓘ Bastnäsite | (Ce/Nd/Y/REE)(CO3)F |
| O | ⓘ Thortveitite var. Befanamite | Sc2Si2O7 |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | ⓘ Beryl | Be3Al2(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. Gilbertite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Ilmenite | Fe2+TiO3 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Microcline | K(AlSi3O8) |
| O | ⓘ Monazite Group | REE(PO4) |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rutile | TiO2 |
| O | ⓘ Samarskite-(Y) | YFe3+Nb2O8 |
| O | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | ⓘ Quartz var. Smoky Quartz | SiO2 |
| O | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| O | ⓘ Rutile var. Strüverite | (Ti,Ta,Fe)O2 |
| O | ⓘ Thortveitite | Sc2Si2O7 |
| O | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| O | ⓘ Vermiculite | Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O |
| O | ⓘ Xenotime-(Y) | Y(PO4) |
| O | ⓘ Zircon | Zr(SiO4) |
| O | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| O | ⓘ Zircon var. Malacon | Zr(SiO4) |
| O | ⓘ Rossovskyite | (Fe3+,Ta)(Nb,Ti)O4 |
| O | ⓘ Nioboheftetjernite | ScNbO4 |
| F | Fluorine | |
| F | ⓘ Bastnäsite | (Ce/Nd/Y/REE)(CO3)F |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Na | Sodium | |
| Na | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Na | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Mg | Magnesium | |
| Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Mg | ⓘ Vermiculite | Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O |
| Al | Aluminium | |
| Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | ⓘ Beryl | Be3Al2(Si6O18) |
| Al | ⓘ Muscovite var. Gilbertite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Microcline | K(AlSi3O8) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Al | ⓘ Vermiculite | Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O |
| Al | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | Silicon | |
| Si | ⓘ Thortveitite var. Befanamite | Sc2Si2O7 |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | ⓘ Beryl | Be3Al2(Si6O18) |
| Si | ⓘ Muscovite var. Gilbertite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Microcline | K(AlSi3O8) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | ⓘ Quartz var. Smoky Quartz | SiO2 |
| Si | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Si | ⓘ Thortveitite | Sc2Si2O7 |
| Si | ⓘ Vermiculite | Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O |
| Si | ⓘ Zircon | Zr(SiO4) |
| Si | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | ⓘ Zircon var. Malacon | Zr(SiO4) |
| P | Phosphorus | |
| P | ⓘ Monazite Group | REE(PO4) |
| P | ⓘ Xenotime-(Y) | Y(PO4) |
| K | Potassium | |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| K | ⓘ Muscovite var. Gilbertite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Microcline | K(AlSi3O8) |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Euxenite-(Y) | (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 |
| Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Sc | Scandium | |
| Sc | ⓘ Thortveitite var. Befanamite | Sc2Si2O7 |
| Sc | ⓘ Thortveitite | Sc2Si2O7 |
| Sc | ⓘ Nioboheftetjernite | ScNbO4 |
| Ti | Titanium | |
| Ti | ⓘ Biotite | K(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 | ⓘ Ilmenite | Fe2+TiO3 |
| Ti | ⓘ Rutile | TiO2 |
| Ti | ⓘ Rutile var. Strüverite | (Ti,Ta,Fe)O2 |
| Ti | ⓘ Rossovskyite | (Fe3+,Ta)(Nb,Ti)O4 |
| Mn | Manganese | |
| Mn | ⓘ Spessartine | Mn32+Al2(SiO4)3 |
| Fe | Iron | |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | ⓘ Columbite-(Fe) | Fe2+Nb2O6 |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Ilmenite | Fe2+TiO3 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Samarskite-(Y) | YFe3+Nb2O8 |
| Fe | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Fe | ⓘ Rutile var. Strüverite | (Ti,Ta,Fe)O2 |
| Fe | ⓘ Vermiculite | Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O |
| Fe | ⓘ Rossovskyite | (Fe3+,Ta)(Nb,Ti)O4 |
| Y | Yttrium | |
| 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) |
| Zr | Zirconium | |
| Zr | ⓘ Zircon | Zr(SiO4) |
| Zr | ⓘ Zircon var. Malacon | Zr(SiO4) |
| Nb | Niobium | |
| 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 | ⓘ Nioboheftetjernite | ScNbO4 |
| Ce | Cerium | |
| Ce | ⓘ Bastnäsite | (Ce/Nd/Y/REE)(CO3)F |
| Ce | ⓘ Euxenite-(Y) | (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 |
| Nd | Neodymium | |
| Nd | ⓘ Bastnäsite | (Ce/Nd/Y/REE)(CO3)F |
| Ta | Tantalum | |
| 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 |
| Th | Thorium | |
| Th | ⓘ Euxenite-(Y) | (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 |
| U | Uranium | |
| U | ⓘ Euxenite-(Y) | (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 |
Other Regions, Features and Areas containing this locality
AfricaContinent
African Plate
- Antenanarivo BlockOrogenic Belt
Madagascar
- ⭔Antananarivo ProvinceProvince
Somali PlateTectonic Plate
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References
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
Befanamo pegmatite, Beronono Commune, Anjozorobe District, Analamanga, Madagascar