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Oxycalciopyrochlore

A valid IMA mineral species
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02204200017271951179303.jpg
Oxycalciopyrochlore

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
00553440017271951181227.jpg
Oxycalciopyrochlore

Auf Dickel, Rockeskyll volcanic complex, Rockeskyll, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
09953560017271951184350.jpg
Titan-uranoan Oxycalciopyrochlore, etc.

Myan Gyi mine, Thurein-taung, Kyauk-Pyat-That, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar
03865200017866614993291.jpg
Oxycalciopyrochlore

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
00553440017271951181227.jpg
Oxycalciopyrochlore

Auf Dickel, Rockeskyll volcanic complex, Rockeskyll, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
09953560017271951184350.jpg
Titan-uranoan Oxycalciopyrochlore, etc.

Myan Gyi mine, Thurein-taung, Kyauk-Pyat-That, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar
02204200017271951179303.jpg
Oxycalciopyrochlore

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
00553440017271951181227.jpg
Oxycalciopyrochlore

Auf Dickel, Rockeskyll volcanic complex, Rockeskyll, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
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About OxycalciopyrochloreHide

Formula:
Ca2Nb2O6O
Colour:
Brownish-black
Lustre:
Vitreous
Hardness:
5
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.


Unique IdentifiersHide

Mindat ID:
40342
Long-form identifier:
mindat:1:1:40342:5

IMA Classification of OxycalciopyrochloreHide

IMA status:
Approved
IMA status notes:
Redefined by the IMA
IMA Formula:
Ca2Nb5+2O6O
Approval year:
1978
First published:
1979
Approval history:
Approved by IMA in 1978 as stibiobetafite.
Redefined and renamed by IMA in 2010 as oxycalciopyrochlore.

Classification of OxycalciopyrochloreHide

Strunz-mindat (2026):
4.DH.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
H : With large (+- medium-sized) cations; sheets of edge-sharing octahedra

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
OcpclIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of OxycalciopyrochloreHide

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

Optical Data of OxycalciopyrochloreHide

Type:
Isotropic
Colour in reflected light:
Medium gray
Comments:
n = >1.78.

Chemistry of OxycalciopyrochloreHide

Mindat Formula:
Ca2Nb2O6O
Element Weights:
Element% weight
Nb49.161 %
O29.631 %
Ca21.207 %

Calculated from ideal end-member formula.
Elements listed:
Ca, Nb, O - search for minerals with similar chemistry

Chemical AnalysisHide

Oxide wt%:
 12345
Na2O2,18 %2,15 %0,12 %
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:
IDLocalityReferenceNotes
1Atagoyama, Koriyama City, Fukushima Prefecture, Japan
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
2  "  "
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
3  "  "
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
4  "  "
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
5  "  "
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

Crystallography of OxycalciopyrochloreHide

Crystal System:
Isometric
Class (H-M):
m3m(4/m32/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.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites
36 : Carbonatites, kimberlites, and related igneous rocks

Type Occurrence of OxycalciopyrochloreHide

Type Locality:
ⓘ Věžná I pegmatite, Věžná, Žďár nad Sázavou District, Vysočina Region, Czech Republic
General Appearance of Type Material:
Discrete octahedra, or granular aggregates veining and replacing partly disordered columbite and niobian rutile.
Place of Conservation of Type Material:
University of Manitoba, Winnipeg, Manitoba, Canada, M5233.
Royal Ontario Museum, Toronto, Ontario, Canada, M35630.
Geological Setting of Type Material:
In a pegmatite cross-cutting a serpentinite.
Associated Minerals at Type Locality:
'Columbite-(Fe)-Columbite-(Mn) Series''Niobium-bearing Rutile'

Synonyms of OxycalciopyrochloreHide

Other Language Names for OxycalciopyrochloreHide

Varieties of OxycalciopyrochloreHide

Titan-uranoan OxycalciopyrochloreSome specimens of former Betafite (of Hogarth 1977) have turned out to be Ti- and U-bearing oxycalciopyrochlores with contents of UO2 up to 24.7 mass% and ThO2 3.2 mass%.

Relationship of Oxycalciopyrochlore to other SpeciesHide

Member of:
Pyrochlore Group > Pyrochlore Supergroup
Other Members of Pyrochlore Group:
Cesiokenopyrochlore◻Nb2(O,OH)6(Cs,◻) Iso. m3m(4/m32/m) : Fd3m
Fluorcalciopyrochlore(Ca,Na)2(Nb,Ti)2O6FIso.
'Fluorhydropyrochlore'A 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/m32/m)
'Fluorplumbopyrochlore'(Pb,Y,Th,U,Na,Ca)2-x(Nb,Ti)2O6FIso.
'Fluorstrontiopyrochlore'(Sr,◻)2Nb2(O,OH)6F
Hydrokenopyrochlore(◻,x)2Nb2O6(H2O,Cs)Iso. m3m(4/m32/m) : Fd3m
Hydropyrochlore(H2O,◻)2Nb2(O,OH)6(H2O)Iso. m3m(4/m32/m) : Fd3m
Hydroxycalciopyrochlore(Ca,Na,U,◻)2(Nb,Ti)2O6(OH)Iso. m3m(4/m32/m) : Fd3m
Hydroxykenopyrochlore(◻,Ce,Ba)2(Nb,Ti)2O6(OH,F)Iso. m3m(4/m32/m) : Fd3m
Hydroxymanganopyrochlore(Mn2+,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) Iso. m3(2/m3)
Hydroxynatropyrochlore(Na,Ca,Ce)2Nb2O6(OH)Iso. m3m(4/m32/m) : Fd3m
Hydroxyplumbopyrochlore (Pb1.5◻0.5)Nb2O6(OH)Iso. m3m(4/m32/m) : Fd3m
'Kenoplumbopyrochlore'(Pb,◻)Nb2O6(◻,O)
'Oxynatropyrochlore'(Na,Ca,U)2Nb2O6(O,OH)
OxyplumbopyrochlorePb2Nb2O6OIso. m3m(4/m32/m) : Fd3m
'Oxyyttropyrochlore-(Y)'(Y,◻)2Nb2O6O
'Strontiopyrochlore (of Hogarth 1977)'(Sr,Ce,Ca)0.66(Nb,Fe)2(O,OH)7
'Unnamed (Sb-analogue of Hydroxymanganopyrochlor)'(Mn,Ca,Y)2(Sb,Ti)2O6(OH)

Related Minerals - Strunz-mindat GroupingHide

4.DH.Cesiokenopyrochlore◻Nb2(O,OH)6(Cs,◻) Iso. m3m(4/m32/m) : Fd3m
4.DH.Roméite GroupA2(Sb5+)2O6Z
4.DH.OxyplumboroméitePb2Sb2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.Fluornatropyrochlore(Na,Pb,Ca,REE,U)2Nb2O6FIso. m3m(4/m32/m)
4.DH.Hydroxykenomicrolite(◻,Na,Sb3+)2Ta2O6(OH,Cs)Iso. m3m(4/m32/m) : Fd3m
4.DH.'Fluornatroroméite'(Na,Ca)2Sb2(O,OH)6F
4.DH.Oxyyttrobetafite-(Y)Y2Ti2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.05Thorutite(Th,U,Ca)Ti2(O,OH)6Mon.
4.DH.05OrthobranneriteU4+U6+Ti4O12(OH)2Orth.
4.DH.05BranneriteUTi2O6Mon. 2/m : B2/m
4.DH.10KassiteCaTi2O4(OH)2Mon. 2/m : P21/b
4.DH.10Lucasite-(La)Mon. 2 : B2
4.DH.10Lucasite-(Ce)CeTi2(O,OH)6Mon.
4.DH.15'Fluorhydropyrochlore'
4.DH.15Hydrokenoelsmoreite◻2W2O6(H2O)Iso. m3m(4/m32/m) : Fd3m
4.DH.15'Hydroxynatromicrolite'(Na,Bi3+,◻)2Ta2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Hydroplumboelsmoreite(Pb,◻)(W,Fe3+)2O6 · H2OIso. m3m(4/m32/m) : Fd3m
4.DH.15Hydropyrochlore(H2O,◻)2Nb2(O,OH)6(H2O)Iso. m3m(4/m32/m) : Fd3m
4.DH.15'Unnamed (Sb-analogue of Hydroxymanganopyrochlor)'(Mn,Ca,Y)2(Sb,Ti)2O6(OH)
4.DH.15Hydroxynatropyrochlore(Na,Ca,Ce)2Nb2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Hydrokenopyrochlore(◻,x)2Nb2O6(H2O,Cs)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Oxybismutomicrolite(Bi1.33◻0.67)Σ2Ta2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.15Kenomicrolite◻2Ta2[O4(OH)2]◻Iso. m3m(4/m32/m) : Fd3m
4.DH.15Fluornatromicrolite(Na1.5Bi0.5)Ta2O6FIso. m3m(4/m32/m) : Fd3m
4.DH.15'Oxynatropyrochlore'(Na,Ca,U)2Nb2O6(O,OH)
4.DH.15Hydroxycalciopyrochlore(Ca,Na,U,◻)2(Nb,Ti)2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Fluorcalciopyrochlore(Ca,Na)2(Nb,Ti)2O6FIso.
4.DH.15'Fluorstrontiopyrochlore'(Sr,◻)2Nb2(O,OH)6F
4.DH.15OxyplumbopyrochlorePb2Nb2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.15'Fluorplumbopyrochlore'(Pb,Y,Th,U,Na,Ca)2-x(Nb,Ti)2O6FIso.
4.DH.15'Bismutomicrolite (of Hogarth 1977)'Iso. m3m(4/m32/m) : Fd3m
4.DH.15'Bismutopyrochlore (of Chukanov et al.)'(Bi,Ca,U,Pb)2-xNb2(O,OH)6(OH)Amor.
4.DH.15'Kenoplumbopyrochlore'(Pb,◻)Nb2O6(◻,O)
4.DH.15Hydroxyplumbopyrochlore (Pb1.5◻0.5)Nb2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.15'Stibiomicrolite (of Groat et al.)'
4.DH.15'Oxyyttropyrochlore-(Y)'(Y,◻)2Nb2O6O
4.DH.15'Fluorkenopyrochlore'(◻,Sr,Ce,Ca,Na)2(Nb,Ti)2O6F
4.DH.15HydroxycalciomicroliteCa1.5Ta2O6(OH)Iso. 432 : P4232
4.DH.15'Strontiopyrochlore (of Hogarth 1977)'(Sr,Ce,Ca)0.66(Nb,Fe)2(O,OH)7
4.DH.15 va'Alumotungstite'◻2W2O6(H2O)Iso. m3m(4/m32/m) : Fd3m
4.DH.15'Oxycalciobetafite'Ca2(Ti,Nb)2O6O
4.DH.15'Oxyuranobetafite'(U,Ca,◻)2(Ti,Nb)2O6O
4.DH.15Fluorcalciomicrolite(Ca,Na)2(Ta,Nb)2O6FIso. m3m(4/m32/m) : Fd3m
4.DH.15OxycalciomicroliteCa2Ta2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.15OxystannomicroliteSn2Ta2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.15Kenoplumbomicrolite(Pb,◻)2Ta2O6(◻,OH,O)Iso.
4.DH.15Oxynatromicrolite(Na,Ca,U)2(Ta,Nb)2O6(O,F)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Oxystibiomicrolite(Sb3+,Ca)2Ta2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.15'Hydromicrolite'(H2O,◻)2Ta2(O,OH)6(H2O)
4.DH.15'Plumbomicrolite (of Hogarth 1977)'
4.DH.15Hydrokenomicrolite(◻,H2O)2Ta2(O,OH)6(H2O)Iso. m3m(4/m32/m)
4.DH.15Hydroxykenoelsmoreite(◻,Pb)2(W,Fe3+,Al)2(O,OH)6(OH)Trig. 3 : R3
4.DH.15 va'Yttromicrolite (of Hogarth)'(Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7Iso. m3m(4/m32/m) : Fd3m
4.DH.15Hydroxykenopyrochlore(◻,Ce,Ba)2(Nb,Ti)2O6(OH,F)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Hydroxymanganopyrochlore(Mn2+,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) Iso. m3(2/m3)
4.DH.20'Cuproroméite'Cu2Sb2(O,OH)7Iso.
4.DH.20Hydroxycalcioroméite(Ca,Sb3+)2(Sb5+,Ti)2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.20BindheimitePb2Sb2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.20Hydroxyferroroméite(Fe2+1.5◻0.5)Sb5+2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.20Fluorcalcioroméite(Ca,Na,◻)2Sb5+2(O,OH)6FIso. m3m(4/m32/m) : Fd3m
4.DH.20OxycalcioroméiteCa2Sb2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.20StetefeldtiteAg2Sb2(O,OH)7Iso.
4.DH.20StibiconiteSb3+Sb5+2O6(OH) Iso. m3m(4/m32/m)
4.DH.20MonimolitePb2Sb5+2O7Iso. m3m(4/m32/m)
4.DH.25RosiaitePbSb5+2O6Trig. 3m(32/m) : P31m
4.DH.30Stefanweissite(Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14Orth. mmm(2/m2/m2/m) : Cmca
4.DH.30ZirconoliteCaZrTi2O7Orth.
4.DH.30Laachite(Ca,Mn)2Zr2Nb2TiFeO14Mon. 2/m : B2/b
4.DH.30Nöggerathite-(Ce)(Ce,Ca)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14Orth. mmm(2/m2/m2/m) : Cmca
4.DH.35LiandratiteU(Nb,Ta)2O8Trig. 3m(32/m) : P31m
4.DH.35PetscheckiteUFe(Nb,Ta)2O8Hex.
4.DH.40IngersoniteCa3Mn2+Sb5+4O14Trig. 32 : P3121
4.DH.45PittongiteNa0.22(W,Fe3+)(O,OH)3 · 0.44H2OHex. 6m2 : P6m2
4.DH.50TazzoliiteBa4-xNaxTi2Nb3SiO17[PO2(OH)2]x(OH)(1-2x) Orth. mmm(2/m2/m2/m) : Fmmm

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.

Internet Links for OxycalciopyrochloreHide

References for OxycalciopyrochloreHide

Localities for OxycalciopyrochloreHide

Showing 24 localities.

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.
Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
China
 
  • Sichuan
    • Liangshan Yi
      • Huili County
Xue et al. (2021)
Xue et al. (2021)
      • Xichang County
        • Taihe intrusion
Rubo Zhang et al. (2003)
Czech Republic
 
  • Karlovy Vary Region
    • Cheb District
      • Ovesné Kladruby
Jirasek et al. (2026)
  • Moravian-Silesian Region
    • Nový Jičín District
      • Nový Jičín
        • Bludovice
Matýsek et al. (2025)
  • Vysočina Region
    • Žďár nad Sázavou District
      • Věžná
Černý et al. (1979) +1 other reference
Germany
 
  • Baden-Württemberg
    • Freiburg Region
      • Breisgau-Hochschwarzwald
        • Vogtsburg im Kaiserstuhl
Anthony (1997)
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Mendig
        • Mendig
in the collection of Christof Schäfer
    • Vulkaneifel
      • Gerolstein
        • Rockeskyll
          • Rockeskyll volcanic complex
in the collection of Christof Schäfer
Israel
 
  • Southern District
    • Beersheba Subdistrict
      • Tamar Regional Council
Galuskina et al. (2026)
Japan
 
  • Fukushima Prefecture
    • Koriyama City
Matsubara et al. (2013)
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Kyauk-Pyat-That
          • Thurein-taung
[var: Titan-uranoan Oxycalciopyrochlore] Pavel M. Kartashov analytical data (2010)
Norway
 
  • Telemark
    • Porsgrunn
      • Bjørkedalen
Chukanov (2014)
Romania
 
  • Hunedoara County
HÎRTOPANU et al. (2014)
Russia
 
  • Chelyabinsk Oblast
    • Ilmen Mountains
Makagonov et al. (2017)
    • Vishnevye Mountains
      • Buldym Lake
Popova et al. (2018)
  • Krasnoyarsk Krai
    • Boguchansky District
      • Chadobets alkaline complex
Sharygin et al. (2017, August)
  • Murmansk Oblast
    • Kovdorsky District
Terry Williams (1996) +2 other references
Slovakia
 
  • Banská Bystrica Region
    • Lučenec District
      • Čamovce
Huraiová et al. (2019)
Tajikistan
 
  • Gorno-Badakhshan
    • Rangkul' Highlands
Chukanov et al. (1999) +1 other reference
USA
 
  • Virginia
    • Amelia County
      • Amelia (Amelia Court House)
Duresky et al. (2025)
The Moon
 
  • Mare Crisium
[var: Titan-uranoan Oxycalciopyrochlore] Mokhov et al. (2008)
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