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Betafite Group

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About 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 ◻
Name:
Betafite as a 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 were present in their samples. Titanium-rich minerals intergrown with pyrochlore supergroup 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.


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 ◻

Varieties of Betafite GroupHide

Barian Betafite (of Mironov & Gofman)Variety of "betafite" with content of BaO 21 wt.% and more.
According to Hogarth's nomenclature the mineral should be named Barian Uranbetafite. According to the later nomenclature of 2010 it belongs to "zero-valent dominant" members of Betafite group (T...

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 GroupA2-mTa2X6-wZ-nIso. 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

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

References for Betafite GroupHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hogarth, D.D. (1961) A Study of Pyrochlore and Betafite. Canadian Mineralogist: 6: 610-633.
Lumpkin, G.R. and Ewing, R.C. (1996) Geochemical alteration of pyrochlore group minerals: Betafite subgroup. American Mineralogist: 81: 1237-1248.
Atencio, D., Andrade, M.B., Christy, A.G., Giere, R., and Kartashov P.M. (2010) The pyrochlore supergroup of minerals: nomenclature. Canadian Mineralogist: 48: 673-698.
Brik, M.G. & Srivastava, A.M. (2012): Pyrochlore structural chemistry: predicting the lattice constant by the ionic radii and electronegativities of the constituting ions. J. Am. Ceram. Soc. 95, 1454-1460.
Christy, A.G. and Atencio, D. (2013) Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine: 77: 13-20.

Internet Links for Betafite GroupHide

Localities for Betafite GroupHide

ⓘ - 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.
Austria
 
  • Tyrol
    • North Tyrol
      • Ötz valley
[Oxycalciobetafite] Gasteiger, P., Tropper, P., Haefeker, U. & Tessadri, R. (2013): Petrographie und Mineralchemie von Betafit aus dem Pollestal (Ötztal-Stubai Kristallin). Mitteilungen der Österreichischen Mineralogischen Gesellschaft 159, 55 (abs.).
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
 
  • 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 District
      • Svratka
        • Fryšava
Černý P., Veselovský F.: Výskyt částečně desilikovaných pegmatitů pronikajících serpentinitem v obci Tři Studně. Minerál, 2013, roč. 21, č. 4, s. 299-304.
Germany
 
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Mendig
        • Niedermendig
[Oxycalciobetafite] Blaß, G. and Kruijen, F. (2015) Neuigkeiten aus der Vulkaneifel (II/2015). Mineralien-Welt, 26(5), 80-90.
Italy
 
  • Latium
    • Viterbo Province
      • Vico volcanic complex (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.
Japan
 
  • Ehime Prefecture
    • Inland Sea (Setonaikai)
      • Yuge Island
[Oxycalciobetafite] Yukikazu Ogoshi, Tetsuo Minakawa (2011) Nb- Ta minerals in metasomatic skarn from Yuge Is. 2011 Joint Annual Meeting of Japan Association of Mineralogical Sciences and The Geological Society of Japan, Session ID: R1-P17
  • Kyushu Region
    • Fukuoka Prefecture
      • Itoshima-gun
[Oxycalciobetafite] Uehara, S., Enju, S. and Iwano, S. (2013) Reinvestigation of "betafite-pyrochlore" from Mitoko, Itoshima, Fukuoka Prefecture, Japan. The abstracts with PROGRAM 2013 Annual meeting of Japan Association of Mineralogical Sciences, R1–06, 58 (in Japanese).; Matsubara, S., Miyawaki, R., Yokoyama, K., Momma, K., Shigeoka, M., and Hashimoto, E. (2013) Pyrochlore and microlite in a pegmatite at Atagoyama, Koriyama City, Fukushima Prefecture, Japan. Bulletin of the National Museum of Nature and Science, Ser. C, 39, 1–6 (referring to Uehara et al., 2013).
Poland
 
  • Lower Silesia
    • 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.
Russia
 
  • Zabaykalsky Krai
    • Buriatia Republic (Buryatia)
      • Ermakovskoe Be Deposit
        • Zunshibir' valley
P.M. Kartashov data; Mironov A.G. and Gofman A.F, (1979) Barian betafite in pegmatites of Transbaikalien, - Minerals and Minerals Paragenesisa of Rocks and Ores, Leningrad, Nauka, p.127-132 (in Russian).
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.
  • Colorado
    • Chaffee Co.
      • Trout Creek Pass Pegmatite District
        • Buena Vista
Mark Coolbaugh
  • 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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