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Betafite Group

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Formula:
A2(Ti,Nb)2O6Z
A is primarily Ca or U4+ but can also be Na, Sn2+, Sr, Pb2+, Sb3+, Y, H2O or ◻.

Z is primarily O, but can also be OH, F, H2O or ◻
Name:
Betafite the species, was named in 1912 by Antoine François Alfred Lacroix for the "type" locality. Betafite was redefined in 1961, by Donald D. Hogarth and, betafite remained a species, but frequently with "anomalous" chemistry. Lumpkin and Ewing (1996) studied nine specimens historically labeled "betafite" and discovered that replacement and alteration was present in their samples. Titanium-rich minerals intergrown with pyrochlore super group crystals gave a false impression of the bulk chemistry of specimens. Atencio, et al. (2010)reported on the IMA-approved supergroup nomenclature and Christy and Atencio (2013) added corrections to the IMA report.

The result of modern pinpoint analyses is that almost all specimens formerly labeled betafite are no longer members of that group/series. New analyses, including determination of H2O, OH, and F are necessary to identify the species of a particular sample. The root-name, betafite, was retained for historical reasons.
Ti-dominant members of the Pyrochlore Supergroup.

The nomenclature was recently revised by Atencio et al. (2010); see also Christy & Atencio (2013). The reason "betafite group" species are so scarce when they previously seemed to be widespread is that many erstwhile "betafite group" specimens, particularly large crystals from Madagascar, were partially intergrown with rutile and several rare titanium-rich species. Chemical analyses of bulk specimens showed an erroneously high titanium content due to inclusions.


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Chemical Properties of Betafite GroupHide

Formula:
A2(Ti,Nb)2O6Z

A is primarily Ca or U4+ but can also be Na, Sn2+, Sr, Pb2+, Sb3+, Y, H2O or ◻.

Z is primarily O, but can also be OH, F, H2O or ◻

Relationship of Betafite Group to other SpeciesHide

Other Members of this group:
Coulsellite GroupGroup, where M2+ cations are dominant at the B site, and Mg is dominant among them, and F1– is ...
Elsmoreite GroupW-dominant members of the Pyrochlore Supergroup.
Microlite GroupTa-dominant members of the Pyrochlore Supergroup.Iso. m3m (4/m 3 2/m) : Fd3m
Pyrochlore GroupA2Nb2(O,OH)6Z
Ralstonite GroupGroup, where M3+ cations are dominant at the B site, and Al is dominant among them, and F1– is ...
Roméite GroupSb-dominant members of the Pyrochlore Supergroup.
Group Members:
Oxycalciobetafite Ca2(Ti,Nb)2O6O
Oxyuranobetafite (U,Ca,◻)2(Ti,Nb)2O6O

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Betafite Group in petrologyHide

Accessory component of (items highlighted in red)

References for Betafite GroupHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hogarth, Donald D.(1961): A Study of Pyrochlore and Betafite. Canadian Mineralogist. 6: 610-633.
Lumpkin, Gregory R. and Ewing, Rodney C.(1996) : Geochemical alteration of pyrochlore group minerals: Betafite subgroup. American Mineralogist. 81: 1237-1248.
Atencio Daniel, Andrade M. B., Christy A. G., Giere R., Kartashov Pavel M. (2010): The pyrochlore supergroup of minerals: nomenclature. Canadian Mineralogist. 48: 673-698.
Christy, A. G. and Atencio, Daniel (2013): Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine. 77: 13-20.

Internet Links for Betafite GroupHide

Localities for Betafite GroupHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Queensland
    • Tablelands Region
      • Kinrara National Park
Sutherland,FL, Coenraads, R, Abduriyim, A and Meffre, S., 2013. Lava Plains, NE Queensland, gem mineral suite. Abstracts, 36th Annual Seminar, Mineralogical Societies of Australasia. Sydney. p. 21-23.
Canada
 
  • Ontario
    • Haliburton Co.
      • Lutterworth Township
[Oxycalciobetafite] Hogarth, D. (1961) A Study of Pyrochlore and Betafite, Canadian Mineralogist, v. 6, p. 610-633.
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • Olomouc Region
      • Šumperk (Mährisch Schönberg)
        • Maršíkov (Marchendorf)
Chládek,Š.:Mineralogická charakteristika pegmatitu na Lysé hoře u Maršíkova v Hrubém Jeseníku. Bakalářská práce,Univerzita Palackého Olomouc,2011,s.1-44.
    • Vysočina Region
      • Žďár nad Sázavou
        • Fryšava
Černý P., Veselovský F.: Výskyt částečně desilikovaných pegmatitů pronikajících serpentinitem v obci Tři Studně. Minerál, 2013, roč. 21, č. 4, s. 299-304.
Italy
 
  • Latium
    • Viterbo Province
      • Vico Lake
        • Vetralla
[Oxycalciobetafite] Cámara, F., Williams, C.T., Della Ventura, G., Oberto, R. & Caprilli, E. (2004): Non-metamict betafite from Le Carcarelle (Vico volcanic complex, Italy): occurrence and crystal structure. Mineralogical Magazine: 68: 939-950.; Atencio, D., Andrade, M.B., Christy, A.G., Gieré, R., Kartashov, P.M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist: 48: 673-698.
Poland
 
  • Lower Silesia (Dolnośląskie)
    • Dzierżoniów District
      • Piława Górna (Ober Peilau; Gnadenfrei)
PIECZKA et al. 2010: Nb-Ta minerals in pegmatites in the DSS mine at Piława Górna, Góry Sowie Block, southwestern Poland. Mineralogia - Special Papers, 37.
Switzerland
 
  • Grischun (Grisons; Graubünden)
    • Hinterrhein Valley
      • Ferrera Valley
        • Ausserferrera
[Oxycalciobetafite] Brugger J., Giere R. (1999) As, Sb, Be and Ce enrichment in minerals from metamorphosed Fe-Mn deposit, Val Ferrera, Eastern Swiss Alps, - Canadian Mineralogist, 37, pp.37-52.
USA
 
  • Arizona
    • Mohave Co.
      • Aquarius Mts (Aquarius Range; Peacock Range)
HANSON , S.L., S IMM ONS , W.B., & F ALSTER , A.U. (2007) : A Reevaluation of Nb - Ta - Ti Oxides from the Rare Metals Mine, Mojave County Pegmatite District, Northwestern Arizona. Rochester Mineralogi cal Symposium Abstracts. No. 34, p. 13-14.
  • Michigan
    • Marquette Co.
      • Republic
Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
The Moon
 
  • Fra Mauro Highlands
[Oxycalciobetafite] Meyer C. and Yang S.V. (1988) Tungsten-bearing yttrobetafite in lunar granophyre, - Am. Mineral. 73, 1420-1425.
  • Mare Crisium
[Oxyuranobetafite] Mokhov, A.V., Kartashov, P.M., Bogatikov, O.A., e.a. (2008) Fluorite, hatchettolite, calcium sulfate, and bastnasite-(Ce) in the lunar regolith from Mare Crisium. Doklady Earth Sciences, 422(1), 1178-1180, Atencio, D., Andrade, M.B., Christy, A.G., Gieré, R., Kartashov, P.M. (2010): The pyrochlore supergroup of minerals: nomenclature. Canadian Mineralogist, 48, 673-698.
Mineral and/or Locality  
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