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Hydroxycalciopyrochlore

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About HydroxycalciopyrochloreHide

Formula:
(Ca,Na,U,□)2(Nb,Ti)2O6(OH)
Colour:
Brownish-black, greenish-black and black
Lustre:
Greasy
Hardness:
5 - 6
Specific Gravity:
5.10
Crystal System:
Isometric
The Ca analogue of hydroxymanganopyrochlore and hydroxyplumbopyrochlore. The OH analogue of fluorcalciopyrochlore. Chemically related to charleshatchettite and 'Unnamed (MSH UK-56)'.


Classification of HydroxycalciopyrochloreHide

Approved
Approval Year:
2011
First Published:
2014

Physical Properties of HydroxycalciopyrochloreHide

Greasy
Transparency:
Translucent
Colour:
Brownish-black, greenish-black and black
Comment:
Colors on fresh sections
Streak:
brown streak
Hardness:
5 - 6 on Mohs scale
Hardness:
VHN100=572 - Vickers
Cleavage:
None Observed
Metamict
Parting:
None observed
Fracture:
Conchoidal
Density:
5.10(3) g/cm3 (Measured)    5.15 g/cm3 (Calculated)
Comment:
Measured by hydrostatic weighing

Chemical Properties of HydroxycalciopyrochloreHide

Formula:
(Ca,Na,U,□)2(Nb,Ti)2O6(OH)
IMA Formula:
(Ca,Na,U,◻)2(Nb,Ti)2O6(OH)
Common Impurities:
Na,U,Ti,Ce,F

Chemical AnalysisHide

Empirical formulas:
Sample IDEmpirical Formula
1(Ca1.08Na0.67U4+0.03Ce0.03La0.02)(Nb1.74Ti0.21Ta0.05(O6.00(OH)0.89·nH2O

Crystallography of HydroxycalciopyrochloreHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 10.381(4) Å
Unit Cell V:
1118.7 ų
Z:
8
Morphology:
Mostly as octahedra, and less often as dodecahedra and tetrahexahedra or combinations thereof. Some occur with an allotriomorphic habit with a thick triangular tabular form.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.9657(100)
2.569(18)
1.8142(34)
1.5463(21)
2.5688 (18)

Type Occurrence of HydroxycalciopyrochloreHide

Place of Conservation of Type Material:
China University of Geosciences, Beijng,China, catalogue number M595-22
Geological Setting of Type Material:
Alkali feldspar granite rare-earth ore deposit (26–27 Ma).
Associated Minerals at Type Locality:

Synonyms of HydroxycalciopyrochloreHide

Relationship of Hydroxycalciopyrochlore 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
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)
OxycalciopyrochloreCa2Nb2O6OIso. m3m (4/m 3 2/m) : Fd3m
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)

Common AssociatesHide

Associated Minerals Based on Photo Data:
Niobophyllite2 photos of Hydroxycalciopyrochlore associated with Niobophyllite on mindat.org.
Monazite-(Ce)2 photos of Hydroxycalciopyrochlore associated with Monazite-(Ce) on mindat.org.

Other InformationHide

Notes:
Dissolves in H3PO4; does not dissolve in HCl and HNO3
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 HydroxycalciopyrochloreHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hogarth, D. (1961) A Study of Pyrochlore and Betafite, Canadian Mineralogist: 6: 610-633.
Bonazzi, P., Bindi, L., Zoppi, M., Capitani, G.C., and Olmi, F. (2006) Single-crystal diffraction and transmission electron microscopy studies of "silicified" pyrochlore from Narssârssuk, Julianehaab district, Greenland. American Mineralogist: 91: 794-801 [as pyrochlore].
Yang, G., Li, G., Xiong, M., Pan, B., and Yan, C. (2011) Hydroxycalciopyrochlore, IMA 2011-026. CNMNC Newsletter no. 10, October 2011, page 2554.
Christy, A.G. and Atencio, D. (2013) Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine: 77: 13-20.
Yang, G., Li, G., Xiong, M., Pan, B., and Yan C. (2014) Hydroxycalciopyrochlore, a new mineral species from Sichuan, China. Acta Geologica Sinica - English Edition: 88: 748–753.

Internet Links for HydroxycalciopyrochloreHide

Localities for HydroxycalciopyrochloreHide

ⓘ - 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.
Canada
 
  • Newfoundland and Labrador
    • Labrador
      • Seal Lake alkaline complex (Letitia Lake)
Pavel M. Kartashov analytical data (2013), Photo id 540666
  • Ontario
    • Haliburton Co.
      • Lutterworth Township
Hogarth, D. (1961) A Study of Pyrochlore and Betafite, Canadian Mineralogist, v. 6, p. 610-633.
    • Hastings Co.
      • Monteagle Township
Bideaux, R. (1997), v. 3, p. 457.; Hogarth, D. (1961) A Study of Pyrochlore and Betafite, Canadian Mineralogist: 6 : 610-633. Masson, S.L. and Gordon J.B. (1981) Radioactive Mineral Deposits of the Pembroke-Renfrew Area; Ontario Geological Survey Mineral Deposit Circular 23.
  • Québec
    • Outaouais
Hogarth, D. (1961) A Study of Pyrochlore and Betafite, Canadian Mineralogist, v. 6, p. 610-633.
China (TL)
 
  • Sichuan Province
    • Liangshan Autonomous Prefecture
      • Mianning Co.
Yang, G., Li, G., Xiong, M., Pan, B. and Yan, C. (2011): Hydroxycalciopyrochlore, IMA 2011-026. CNMNC Newsletter no. 10, October 2011, page 2554; Yang, G., Li, G., Xiong, M., Pan, B., Yan C. (2014): Hydroxycalciopyrochlore, a new mineral species from Sichuan, China. Acta Geologica Sinica - English Edition, 88, 748–753.
  • Xinjiang Autonomous Region
    • Akesu Prefecture (Aksu Prefecture; Aqsu Prefecture)
      • Baicheng Co. (Bay Co.)
Jingwu Yin, Xingkun Shao, Haitao Yang, Tingxian Piao, Haiming Xu, and Jun Wang (2013): Mineral Deposits 32(2), 337-352
Czech Republic
 
  • South Bohemia Region
    • Frymburk
      • Černá v Pošumaví (Schwarzbach im Böhmerwald)
        • Bližná
Drábek;, M., Frýda J., Šarbach M., Skála, R. (2017): Hydroxycalciopyrochlore from a regionally metamorphic marble at Bližná, Southwestern Czech Republic. Neues Jahrbuch für Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry, 194, 49-59.
Denmark
 
  • Greenland
    • Kujalleq
      • Narsaq
        • Igaliku (Igaliko)
          • Narsaarsuk Plateau
Bonazzi, P., Bindi, L., Zoppi, M.,Capitani, G. C. & OLmi, F.(2006): Single-crystal diffraction and transmission electron microscopy studies of "silicified" pyrochlore from Narssârssuk, Julianehaab district, Greenland. American Mineralogist: 91:794-801; 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.
Germany
 
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Mendig
        • Niedermendig
Zubkova. N.V., Chikanov, N.V., Pekov, I.V., Schäfer, Ch.J., Yapaskurt, V.O., Pushcharovsky, D.Yu. (2015): Lanthanum-rich Fluorbritholithe-(Ce) from young alkaline volcanic rock of Eifel (Germany) and ist crystal structure. Cation ordering in Briotholites. Doklady Earth Sciences, Vol. 464, No. 2, pp. 199-202
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast
Chukanov, N.V. (2014): Infrared spectra of mineral species. Extended library. Springer, Dordrecht 2014., p.496
Pavel M. Kartashov analytical data of 2018
Slovakia
 
  • Košice Region
    • Rožňava Co.
      • Dobšiná mining district (Dobschau; Topschau)
Uher P., Bačík P., Števko M., Chládek Š., Fridrichová J. (2018): Elbaite-bearing, Nb-Ta-rich granitic pegmatite from Dobšiná, Gemeric Unit, Eastern Slovakia: the first documented occurrence in the Western Carpathians. Joint 5th Central-European Mineralogical Conference and 7th Mineral Sciences in the Carpathians Conference, Book of Abstracts, 109.
Mineral and/or Locality  
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