Hydropyrochlore
A valid IMA mineral species
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About Hydropyrochlore
Formula:
(H2O,◻)2Nb2(O,OH)6(H2O)
Colour:
Greenish; greenish white
Hardness:
4 - 4½
Crystal System:
Isometric
Member of:
Name:
For the chemical composition and relation to pyrochlore (now a generic name).
The former species kalipyrochlore described by van Wambeke (1965, 1978) is, following the new nomenclature of the pyrochlore supergroup, now classified with a new name, hydropyrochlore (Atencio et al. 2010, Christy & Atencio 2013)
Pseudomorphs to columbite and fersmite are common at the TL.
Pseudomorphs to columbite and fersmite are common at the TL.
Unique Identifiers
Mindat ID:
2140
Long-form identifier:
mindat:1:1:2140:7
GUID
(UUID V4):
(UUID V4):
58af6e13-b90d-4432-98e2-485c694a0aeb
IMA Classification of Hydropyrochlore
Approved
IMA status notes:
Redefined by the IMA
Approval year:
2010
First published:
1965
Approval history:
Approved as kalipyrochlore by IMA in 1977 (Hogarth 1977)
Redefined as hydropyrochlore by IMA in 2010 (special procedure)
Redefined as hydropyrochlore by IMA in 2010 (special procedure)
Classification of Hydropyrochlore
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
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
8.2.1.2
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
2 : A2B2O6(O,OH,F)
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
2 : A2B2O6(O,OH,F)
18.1.8
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Hpcl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Hydropyrochlore
Colour:
Greenish; greenish white
Hardness:
4 - 4½ on Mohs scale
Chemistry of Hydropyrochlore
Mindat Formula:
(H2O,◻)2Nb2(O,OH)6(H2O)
Elements listed:
Common Impurities:
Sr,Ca,Ti,K
Crystallography of Hydropyrochlore
Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Setting:
Fd3m
Cell Parameters:
a = 10.580 Å
Unit Cell V:
1,184.29 ų (Calculated from Unit Cell)
Morphology:
Octahedra
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005370 | Hydropyrochlore | Ercit T S, Hawthorne F C, Cerny P (1994) The structural chemistry of kalipyrochlore, a "hydropyrochlore" The Canadian Mineralogist 32 415-420 | 1994 | 0 | 293 |
CIF Raw Data - click here to close
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
26 : Hadean detrital minerals | |
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
48 : Soil leaching zone minerals | <0.6 |
Type Occurrence of Hydropyrochlore
General Appearance of Type Material:
Greenish octaedra 3-5mm in size, some are corroded and weathered.
Geological Setting of Type Material:
In the residual soils of the Lueshe carbonatite deposit.
Associated Minerals at Type Locality:
Synonyms of Hydropyrochlore
Other Language Names for Hydropyrochlore
German:Kalipyrochlor
Russian:Калипирохлор
Varieties of Hydropyrochlore
Relationship of Hydropyrochlore to other Species
Member of:
Other Members of this group:
Cesiokenopyrochlore | ◻Nb2(O,OH)6(Cs,◻) | Iso. m3m (4/m 3 2/m) : Fd3m |
Fluorcalciopyrochlore | (Ca,Na)2(Nb, Ti)2O6F | Iso. |
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)2Nb2O6F | Iso. m3m (4/m 3 2/m) |
Fluorplumbopyrochlore | (Pb,Y,Th,U,Na,Ca)2-x(Nb,Ti)2O6F | Iso. |
Fluorstrontiopyrochlore | (Sr,◻)2Nb2(O,OH)6F | |
Hydrokenopyrochlore | (◻,x)2Nb2O6(H2O,Cs) | 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,Ca,Ce)2Nb2O6(OH) | Iso. m3m (4/m 3 2/m) : Fd3m |
Hydroxyplumbopyrochlore | (Pb1.5◻0.5)Nb2O6(OH) | Iso. m3m (4/m 3 2/m) : Fd3m |
Kenoplumbopyrochlore | (Pb,◻)Nb2O6(◻,O) | |
Oxycalciopyrochlore | Ca2Nb2O6O | Iso. m3m (4/m 3 2/m) : Fd3m |
Oxynatropyrochlore | (Na,Ca,U)2Nb2O6(O,OH) | |
Oxyplumbopyrochlore | Pb2Nb2O6O | |
Oxyyttropyrochlore-(Y) | (Y,◻)2Nb2O6O | |
Unnamed (Sb-analogue of Hydroxymanganopyrochlor) | (Mn,Ca,Y)2(Sb,Ti)2O6(OH) |
Related Minerals - Strunz-mindat Grouping
4.DH. | Fluornatropyrochlore | (Na,Pb,Ca,REE,U)2Nb2O6F |
4.DH. | Roméite Group | A2(Sb5+)2O6Z |
4.DH. | Hydroxykenomicrolite | (◻,Na,Sb3+)2Ta2O6(OH) |
4.DH. | Fluornatroroméite | (Na,Ca)2Sb2(O,OH)6F |
4.DH. | Oxyplumboroméite | Pb2Sb2O6O |
4.DH. | Cesiokenopyrochlore | ◻Nb2(O,OH)6(Cs,◻) |
4.DH. | Oxyyttrobetafite-(Y) | Y2Ti2O6O |
4.DH.05 | Brannerite | UTi2O6 |
4.DH.05 | Orthobrannerite | U4+U6+Ti4O12(OH)2 |
4.DH.05 | Thorutite | (Th,U,Ca)Ti2(O,OH)6 |
4.DH.10 | Kassite | CaTi2O4(OH)2 |
4.DH.10 | Lucasite-(Ce) | CeTi2(O,OH)6 |
4.DH.15 va | Alumotungstite | ◻2W2O6(H2O) |
4.DH.15 | Bismutomicrolite (of Hogarth 1977) | |
4.DH.15 | Hydroplumboelsmoreite | (Pb,◻)(W,Fe3+)2O6 · H2O |
4.DH.15 | Plumbomicrolite (of Hogarth 1977) | |
4.DH.15 | Stibiomicrolite (of Groat et al.) | |
4.DH.15 | Strontiopyrochlore (of Hogarth 1977) | A2Nb2(O,OH)6Z |
4.DH.15 | Fluornatromicrolite | (Na1.5Bi0.5)Ta2O6F |
4.DH.15 | Bismutopyrochlore (of Chukanov et al.) | (Bi,Ca,U,Pb)2-xNb2(O,OH)6(OH) |
4.DH.15 | Hydrokenoelsmoreite | ◻2W2O6(H2O) |
4.DH.15 | Fluorcalciomicrolite | (Ca,Na)2(Ta,Nb)2O6F |
4.DH.15 | Oxycalciobetafite | Ca2(Ti,Nb)2O6O |
4.DH.15 va | Yttromicrolite (of Hogarth) | (Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7 |
4.DH.15 | Oxynatropyrochlore | (Na,Ca,U)2Nb2O6(O,OH) |
4.DH.15 | Hydroxycalciopyrochlore | (Ca,Na,U,◻)2(Nb,Ti)2O6(OH) |
4.DH.15 | Fluorcalciopyrochlore | (Ca,Na)2(Nb, Ti)2O6F |
4.DH.15 | Oxycalciopyrochlore | Ca2Nb2O6O |
4.DH.15 | Fluorstrontiopyrochlore | (Sr,◻)2Nb2(O,OH)6F |
4.DH.15 | Oxyplumbopyrochlore | Pb2Nb2O6O |
4.DH.15 | Kenoplumbopyrochlore | (Pb,◻)Nb2O6(◻,O) |
4.DH.15 | Oxyyttropyrochlore-(Y) | (Y,◻)2Nb2O6O |
4.DH.15 | Fluorkenopyrochlore | (◻,Sr,Ce,Ca,Na)2(Nb,Ti)2O6F |
4.DH.15 | Oxyuranobetafite | (U,Ca,◻)2(Ti,Nb)2O6O |
4.DH.15 | Oxycalciomicrolite | Ca2Ta2O6O |
4.DH.15 | Oxystannomicrolite | Sn2Ta2O6O |
4.DH.15 | Kenoplumbomicrolite | (Pb,◻)2Ta2O6(◻,OH,O) |
4.DH.15 | Oxystibiomicrolite | (Sb3+,Ca)2Ta2O6O |
4.DH.15 | Hydromicrolite | (H2O,◻)2Ta2(O,OH)6(H2O) |
4.DH.15 | Hydrokenomicrolite | (◻,H2O)2Ta2(O,OH)6(H2O) |
4.DH.15 | Hydroxymanganopyrochlore | (Mn2+,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) |
4.DH.15 | Hydroxycalciomicrolite | Ca1.5Ta2O6(OH) |
4.DH.15 | Fluorplumbopyrochlore | (Pb,Y,Th,U,Na,Ca)2-x(Nb,Ti)2O6F |
4.DH.15 | Hydroxyplumbopyrochlore | (Pb1.5◻0.5)Nb2O6(OH) |
4.DH.15 | Oxynatromicrolite | (Na,Ca,U)2(Ta,Nb)2O6(O,F) |
4.DH.15 | Fluorhydropyrochlore | |
4.DH.15 | Hydroxykenoelsmoreite | (◻,Pb)2(W,Fe3+,Al)2(O,OH)6(OH) |
4.DH.15 | Hydrokenopyrochlore | (◻,x)2Nb2O6(H2O,Cs) |
4.DH.15 | Hydroxykenopyrochlore | (◻,Ce,Ba)2(Nb,Ti)2O6(OH,F) |
4.DH.15 | Hydroxynatropyrochlore | (Na,Ca,Ce)2Nb2O6(OH) |
4.DH.15 | Hydroxynatromicrolite | (Na,Bi3+,◻)2Ta2O6(OH) |
4.DH.15 | Unnamed (Sb-analogue of Hydroxymanganopyrochlor) | (Mn,Ca,Y)2(Sb,Ti)2O6(OH) |
4.DH.15 | Oxybismutomicrolite | (Bi1.33◻0.67)Σ2Ta2O6O |
4.DH.20 | Bindheimite | Pb2Sb2O6O |
4.DH.20 | Hydroxycalcioroméite | (Ca,Sb3+)2(Sb5+,Ti)2O6(OH) |
4.DH.20 | Monimolite | Pb2Sb5+2O7 |
4.DH.20 | Cuproroméite | Cu2Sb2(O,OH)7 |
4.DH.20 | Stetefeldtite | Ag2Sb2(O,OH)7 |
4.DH.20 | Stibiconite | Sb3+Sb5+2O6(OH) |
4.DH.20 | Fluorcalcioroméite | (Ca,Na,◻)2Sb5+2(O,OH)6F |
4.DH.20 | Oxycalcioroméite | Ca2Sb2O6O |
4.DH.20 | Hydroxyferroroméite | (Fe2+1.5◻0.5)Sb5+2O6(OH) |
4.DH.25 | Rosiaite | PbSb5+2O6 |
4.DH.30 | Zirconolite | CaZrTi2O7 |
4.DH.30 | Laachite | (Ca,Mn)2Zr2Nb2TiFeO14 |
4.DH.30 | Nöggerathite-(Ce) | (Ce,Ca)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14 |
4.DH.30 | Stefanweissite | (Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14 |
4.DH.35 | Liandratite | U(Nb,Ta)2O8 |
4.DH.35 | Petscheckite | UFe(Nb,Ta)2O8 |
4.DH.40 | Ingersonite | Ca3Mn2+Sb5+4O14 |
4.DH.45 | Pittongite | Na0.22(W,Fe3+)(O,OH)3 · 0.44H2O |
4.DH.50 | Tazzoliite | Ba4-xNaxTi2Nb3SiO17[PO2(OH)2]x(OH)(1-2x) |
Other Information
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 Hydropyrochlore
mindat.org URL:
https://www.mindat.org/min-2140.html
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References for Hydropyrochlore
Reference List:
Atencio, D., Andrade, M. B., Christy, A. G., Giere, R., Kartashov, P. M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist, 48 (3) 673-698 doi:10.3749/canmin.48.3.673
Localities for Hydropyrochlore
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Angola | |
| Amores-Casals et al. (2019) |
DR Congo (TL) | |
| Van Wambeke (1965) +1 other reference |
Poland | |
| Pieczka et al. (2018) |
Russia | |
| Sharygin +11 other references |
| Starikova et al. (2019) |
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Lueshe Mine, Bwito, Rutshuru Territory, North Kivu, DR Congo