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Oxycalciopyrochlore

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About OxycalciopyrochloreHide

Formula:
Ca2Nb2O6O
Colour:
Brownish-black
Lustre:
Vitreous
Specific Gravity:
5.30
Crystal System:
Isometric
Name:
First described by Černý et al. (1979) as stibiobetafite from Věžná I pegmatite, Moravia, Czech Republic. Renamed by IMA in 2010 according to the new nomenclature of the pyrochlore supergroup as oxycalciopyrochlore.
This page provides mineralogical data about Oxycalciopyrochlore.


Classification of OxycalciopyrochloreHide

Approved
Notes:
Redefined by the IMA
Approval Year:
2010
Approval History:
Approved by IMA in 1978 as stibiobetafite.
Redefined and renamed by IMA in 2010 as oxycalciopyrochlore.

Physical Properties of OxycalciopyrochloreHide

Vitreous
Colour:
Brownish-black
Comment:
It turns pale orange after heating at 700°C for 1 h in air.
Streak:
Creamy-white
Tenacity:
Brittle
Density:
5.30 g/cm3 (Measured)    5.1 g/cm3 (Calculated)

Chemical Properties of OxycalciopyrochloreHide

Formula:
Ca2Nb2O6O

Chemical AnalysisHide

Oxide wt%:
 12345
Na2O2,18 %2,15 %0,12 %0 %0 %
CaO14,06 %13,92 %6,57 %6,58 %5,74 %
Fe2O31,32 %1,30 %1,42 %1,35 %1,20 %
TiO210,55 %10,44 %9,56 %9,48 %10,12 %
Nb2O527,91 %27,62 %26,70 %27,39 %26,98 %
Ta2O518,22 %18,03 %19,06 %17,52 %17,86 %
UO225,12 %24,87 %24,40 %24,15 %23,94 %
H2O0,64 %1,67 %12,17 %13,53 %14,16 %
Total:97 %96 %97 %97 %96 %
Empirical formulas:
Sample IDEmpirical Formula
1(Ca1.14U0.42Na0.32)?1.88(Nb0.95Ti0.60Ta0.37Fe0.08)?2O6.00[O0.61(OH)0.32]?0.93 on the basis of Nb+Ti+Ta+Fe=2
Sample references:
IDLocalityReference
1Atagoyama, Fukushima Prefecture, Tohoku Region, Honshu Island, JapanMatsubara, 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.
2  "  "  "  "
3  "  "  "  "
4  "  "  "  "
5  "  "  "  "

Crystallography of OxycalciopyrochloreHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Setting:
Fd3m
Cell Parameters:
a = 10.35 Å
Unit Cell V:
1110.6 ų
Z:
8
Morphology:
Discrete octahedra, or as granular aggregates.

Type Occurrence of OxycalciopyrochloreHide

General Appearance of Type Material:
Discrete octahedra, or granular aggregates veining and replacing partly disordered columbite and niobian rutile
Geological Setting of Type Material:
In a pegmatite cross-cutting a serpentinite
Associated Minerals at Type Locality:

Varieties of OxycalciopyrochloreHide

Titan-uranoan OxycalciopyrochloreSome specimens of former Betafite (of Hogarth 1977) had turned out Titan-uranoan Oxycalciopyrochlores with contents of UO2 up to 24.7 mas.% and ThO2 3.2 mas.%.

Relationship of Oxycalciopyrochlore to other SpeciesHide

Other Members of this group:
Cesiokenopyrochlore□Nb2(O,OH)6Cs1−x (x ∼ 0.20)Iso. m3m (4/m 3 2/m) : Fd3m
Fluorcalciopyrochlore(Ca,Na)2(Nb, Ti)2O6FIso.
FluorhydropyrochloreA possible new species (See discussion in Atencio et al.
Fluorkenopyrochlore(□,Sr,Ce,Ca,Na)2(Nb,Ti)2O6F
Fluornatropyrochlore(Na,Pb,Ca,REE,U)2Nb2O6FIso. m3m (4/m 3 2/m)
Fluorplumbopyrochlore(Pb,Y,Th,U,Na,Ca)2-x(Nb,Ti)2O6FIso.
Fluorstrontiopyrochlore(Sr,□)2Nb2(O,OH)6F
Hydrokenopyrochlore2Nb2O4(OH)2(H2O)Iso. m3m (4/m 3 2/m) : Fd3m
Hydropyrochlore(H2O,□)2Nb2(O,OH)6(H2O)Iso. m3m (4/m 3 2/m) : Fd3m
Hydroxycalciopyrochlore(Ca,Na,U,□)2(Nb,Ti)2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
Hydroxykenopyrochlore(□,Ce,Ba)2(Nb,Ti)2O6(OH,F)Iso. m3m (4/m 3 2/m) : Fd3m
Hydroxymanganopyrochlore(Mn2+,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) Iso. m3 (2/m 3)
Hydroxynatropyrochlore(Na,Сa,Ce)2Nb2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
Hydroxyplumbopyrochlore(Pb,Ca)2-x(Nb,Ti,Ta)2O6(OH)
Kenoplumbopyrochlore(Pb,□)Nb2O6(□,O)
Oxynatropyrochlore(Na,Ca,U)2Nb2O6(O,OH)
OxyplumbopyrochlorePb2Nb2O6O
Oxyyttropyrochlore-(Y)(Y,◻)2Nb2O6O
Unnamed (Sb-analogue of Hydroxymanganopyrochlor)(Mn,Ca,Y)2(Sb,Ti)2O6(OH)

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.

References for OxycalciopyrochloreHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Černý, P., Hawthorne, F.C., Laflamme, J.H.G., and Hinthorne, J.R. (1979) Stibiobetafite, a new member of the pyrochlore group from Venzá, Czechoslovakia. The Canadian Mineralogist: 17: 583-588.
Atencio, D., Andrade, M.B., Christy, A.G., Gieré, R., and Kartashov, P.M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist: 48: 673-698.
Christy, A.G. and Atencio, D. (2013) Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine: 77: 13-20.

Internet Links for OxycalciopyrochloreHide

Localities for OxycalciopyrochloreHide

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.
China
 
  • Sichuan
    • Liangshan
      • Xichang Co.
        • Taihe intrusion
Rubo Zhang, Chongliang Du, and Zaoyun Long (2003): Journal of Mineralogy and Petrology 24(3), 5-8
Czech Republic (TL)
 
  • Vysočina Region
    • Žďár nad Sázavou District
      • Věžná
Černý, P., Hawthorne, F.C., Laflamme, J.H.G., Hinthorne, J.R. (1979) Stibiobetafite, a new member of the pyrochlore group from Venzá, Czechoslovakia. The Canadian Mineralogist: 17: 583-588.; 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.
Germany
 
  • Baden-Württemberg
    • Kaiserstuhl
Anthony, et al. (1997) Handbook of Mineralogy, v. 3, p. 106.
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Mendig
        • Niedermendig
in the collection of Christof Schäfer
    • Vulkaneifel
      • Gerolstein
        • Rockeskyll
          • Rockeskyll volcanic complex
in the collection of Christof Schäfer
Japan
 
  • Honshu Island
    • Tohoku Region
      • Fukushima Prefecture
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.
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Kyauk-Pyat-That
          • Thurein-taung
Pavel M. Kartashov analytical data (2010)
Norway
 
  • Telemark
    • Porsgrunn
      • Bjørkedalen
Chukanov, N.V. (2014): Infrared spectra of mineral species. Extended library. Springer, Dordrecht 2014., p.434
Russia
 
  • Murmansk Oblast
Williams, C.T. (1996): The occurrence of niobian zirconolite, pyrochlore and baddeleyite in the Kovdor carbonatite complex, Kola Peninsula, Russia. Mineralogical Magazine: 60: 639-646; Atencio D., Andrade M.B., Christy A.G., Giere R., Kartashov P.M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist: 48: 673-698.
Tajikistan
 
  • Viloyati Mukhtori Gorno-Badakhshan (Viloyati Badakhshoni Kuni)
    • Pamir Mts
      • Rangkul' Highlands
Chukanov, N.V., Skrigitil, A.M., Kuzimina, O.V. & Zadov, A.E. (1999): Bismutopyrochlore (Bi,U,Ca,Pb)1+x(Nb,Ta)2O6(OH)•nH2O – a new mineral from the Mika pegmatite vein (eastern Pamirs). Zapiski Vsesoyuznoye Mineralogichestogo Obshchestvo: 128(4):36-41; Atencio D., Andrade M.B., Christy A.G., Giere R., Kartashov P.M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist: 48: 673-698.
The Moon
 
  • Mare Crisium
Mokhov, A.V., Kartashov, P.M., Bogatikov, O.A., Ashikhmina, N.A., Magazina, L.O. and Koporulina, E.V. (2008) Fluorite, hatchettolite, calcium sulfate, and bastnasite-(Ce) in the lunar regolith from Mare Crisium. Doklady Earth Sciences, 422(1), 1178-1180.
Mineral and/or Locality  
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