Cesiokenopyrochlore
A valid IMA mineral species
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Formula:
◻Nb2(O,OH)6(Cs,◻)
(◻∼ 0.20); simplified formula of the holotype: □2(Nb,W,Ta)Σ2O6Cs
Colour:
Light brown
Lustre:
Resinous
Hardness:
5
Specific Gravity:
5.984 (Calculated)
Crystal System:
Isometric
Member of:
Name:
For its chemical composition and relationship to pyrochlore. The Y site is predominantly occupied by Cs (= the prefix cesio-), the A site is dominated by vacancy (= the prefix keno), and the B site is dominated by Nb, hence the root name pyrochlore.
Unique combination of elements: the only known mineral with both Cs and Nb as essential elements.
First natural "niobate" to adopt the inverse pyrochlore structure.
First natural "niobate" to adopt the inverse pyrochlore structure.
Unique Identifiers
Mindat ID:
51565
Long-form identifier:
mindat:1:1:51565:0
IMA Classification of Cesiokenopyrochlore
Approved
IMA Formula:
◻Nb5+2(O,OH)6Cs1-x
Approval year:
2016
First published:
2021
Type description reference:
Classification of Cesiokenopyrochlore
4.DH.
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
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 for Standard |
|---|---|---|
| Ckpcl | 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 Cesiokenopyrochlore
Resinous
Transparency:
Translucent
Colour:
Light brown
Hardness:
5 on Mohs scale
Hardness:
VHN100=567 - 625 kg/mm2 (15 s test time) - Vickers
Hardness Data:
Measured
Comment:
~5
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
5.984 g/cm3 (Calculated)
Comment:
Could not be measured
Optical Data of Cesiokenopyrochlore
Type:
Isotropic
Colour in reflected light:
Light gray
Internal Reflections:
Strong, light-brown
Pleochroism:
Non-pleochroic
Comments:
None observed
Chemistry of Cesiokenopyrochlore
Mindat Formula:
◻Nb2(O,OH)6(Cs,◻)
(◻∼ 0.20); simplified formula of the holotype: □2(Nb,W,Ta)Σ2O6Cs
(◻∼ 0.20); simplified formula of the holotype: □2(Nb,W,Ta)Σ2O6Cs
Element Weights:
Elements listed:
Crystallography of Cesiokenopyrochlore
Crystal System:
Isometric
Class (H-M):
m3m(4/m32/m) - Hexoctahedral
Space Group:
Fd3m
Setting:
Fd3m
Cell Parameters:
a = 10.444(1) Å
Unit Cell V:
1,139.20 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.03 Å | (37) |
| 3.70 Å | (9) |
| 3.15 Å | (100) |
| 3.02 Å | (35) |
| 2.012 Å | (17) |
| 1.848 Å | (19) |
| 1.576 Å | (11) |
| 1.361 Å | (9) |
Reference:
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Cesiokenopyrochlore
General Appearance of Type Material:
Rough, equant crystals, up to 0.05 mm, intergrown with béhierite and rynersonite on a surface of crystal of béhierite.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, catalogue numbers 4954/1
Empirical Formula of Type Material:
Na0.29Ca0.06(Nb0.81W0.69Ta0.50)Σ2[O5.93(OH)0.07]Σ6Cs0.83
Chemical Analysis of Type Material:
| Cs2O | 22.66 % |
|---|---|
| Na2O | 1.74 % |
| CaO | 0.64 % |
| Nb2O5 | 20.87 % |
| Ta2O5 | 21.27 % |
| WO3 | 30.67 % |
| H2O (calc) | 0.12 % |
| Total: | 97.97 % |
Geological Setting of Type Material:
LCT granitic pegmatite
Associated Minerals at Type Locality:
Reference:
Synonyms of Cesiokenopyrochlore
Other Language Names for Cesiokenopyrochlore
German:Cesiokenopyrochlor
Relationship of Cesiokenopyrochlore to other Species
Member of:
Other Members of Pyrochlore Group:
| 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/m32/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/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) | |
| Oxycalciopyrochlore | Ca2Nb2O6O | Iso. m3m(4/m32/m) : Fd3m |
| 'Oxynatropyrochlore' | (Na,Ca,U)2Nb2O6(O,OH) | |
| Oxyplumbopyrochlore | Pb2Nb2O6O | Iso. 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 Grouping
| 4.DH. | Roméite Group | A2(Sb5+)2O6Z |
| 4.DH. | Oxyplumboroméite | Pb2Sb2O6O |
| 4.DH. | Fluornatropyrochlore | (Na,Pb,Ca,REE,U)2Nb2O6F |
| 4.DH. | Hydroxykenomicrolite | (◻,Na,Sb3+)2Ta2O6(OH,Cs) |
| 4.DH. | 'Fluornatroroméite' | (Na,Ca)2Sb2(O,OH)6F |
| 4.DH. | Oxyyttrobetafite-(Y) | Y2Ti2O6O |
| 4.DH.05 | Thorutite | (Th,U,Ca)Ti2(O,OH)6 |
| 4.DH.05 | Orthobrannerite | U4+U6+Ti4O12(OH)2 |
| 4.DH.05 | Brannerite | UTi2O6 |
| 4.DH.10 | Kassite | CaTi2O4(OH)2 |
| 4.DH.10 | Lucasite-(La) | |
| 4.DH.10 | Lucasite-(Ce) | CeTi2(O,OH)6 |
| 4.DH.15 | 'Fluorhydropyrochlore' | |
| 4.DH.15 | Hydrokenoelsmoreite | ◻2W2O6(H2O) |
| 4.DH.15 | 'Hydroxynatromicrolite' | (Na,Bi3+,◻)2Ta2O6(OH) |
| 4.DH.15 | Hydroplumboelsmoreite | (Pb,◻)(W,Fe3+)2O6 · H2O |
| 4.DH.15 | Hydropyrochlore | (H2O,◻)2Nb2(O,OH)6(H2O) |
| 4.DH.15 | 'Unnamed (Sb-analogue of Hydroxymanganopyrochlor)' | (Mn,Ca,Y)2(Sb,Ti)2O6(OH) |
| 4.DH.15 | Hydroxynatropyrochlore | (Na,Ca,Ce)2Nb2O6(OH) |
| 4.DH.15 | Hydrokenopyrochlore | (◻,x)2Nb2O6(H2O,Cs) |
| 4.DH.15 | Oxybismutomicrolite | (Bi1.33◻0.67)Σ2Ta2O6O |
| 4.DH.15 | Kenomicrolite | ◻2Ta2[O4(OH)2]◻ |
| 4.DH.15 | Fluornatromicrolite | (Na1.5Bi0.5)Ta2O6F |
| 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 | 'Fluorplumbopyrochlore' | (Pb,Y,Th,U,Na,Ca)2-x(Nb,Ti)2O6F |
| 4.DH.15 | 'Bismutomicrolite (of Hogarth 1977)' | |
| 4.DH.15 | 'Bismutopyrochlore (of Chukanov et al.)' | (Bi,Ca,U,Pb)2-xNb2(O,OH)6(OH) |
| 4.DH.15 | 'Kenoplumbopyrochlore' | (Pb,◻)Nb2O6(◻,O) |
| 4.DH.15 | Hydroxyplumbopyrochlore | (Pb1.5◻0.5)Nb2O6(OH) |
| 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.15 | Hydroxycalciomicrolite | Ca1.5Ta2O6(OH) |
| 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) |
| 4.DH.15 | 'Oxycalciobetafite' | Ca2(Ti,Nb)2O6O |
| 4.DH.15 | 'Oxyuranobetafite' | (U,Ca,◻)2(Ti,Nb)2O6O |
| 4.DH.15 | Fluorcalciomicrolite | (Ca,Na)2(Ta,Nb)2O6F |
| 4.DH.15 | Oxycalciomicrolite | Ca2Ta2O6O |
| 4.DH.15 | Oxystannomicrolite | Sn2Ta2O6O |
| 4.DH.15 | Kenoplumbomicrolite | (Pb,◻)2Ta2O6(◻,OH,O) |
| 4.DH.15 | Oxynatromicrolite | (Na,Ca,U)2(Ta,Nb)2O6(O,F) |
| 4.DH.15 | Oxystibiomicrolite | (Sb3+,Ca)2Ta2O6O |
| 4.DH.15 | 'Hydromicrolite' | (H2O,◻)2Ta2(O,OH)6(H2O) |
| 4.DH.15 | 'Plumbomicrolite (of Hogarth 1977)' | |
| 4.DH.15 | Hydrokenomicrolite | (◻,H2O)2Ta2(O,OH)6(H2O) |
| 4.DH.15 | Hydroxykenoelsmoreite | (◻,Pb)2(W,Fe3+,Al)2(O,OH)6(OH) |
| 4.DH.15 va | 'Yttromicrolite (of Hogarth)' | (Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7 |
| 4.DH.15 | Hydroxykenopyrochlore | (◻,Ce,Ba)2(Nb,Ti)2O6(OH,F) |
| 4.DH.15 | Hydroxymanganopyrochlore | (Mn2+,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) |
| 4.DH.20 | 'Cuproroméite' | Cu2Sb2(O,OH)7 |
| 4.DH.20 | Hydroxycalcioroméite | (Ca,Sb3+)2(Sb5+,Ti)2O6(OH) |
| 4.DH.20 | Bindheimite | Pb2Sb2O6O |
| 4.DH.20 | Hydroxyferroroméite | (Fe2+1.5◻0.5)Sb5+2O6(OH) |
| 4.DH.20 | Fluorcalcioroméite | (Ca,Na,◻)2Sb5+2(O,OH)6F |
| 4.DH.20 | Oxycalcioroméite | Ca2Sb2O6O |
| 4.DH.20 | Stetefeldtite | Ag2Sb2(O,OH)7 |
| 4.DH.20 | Stibiconite | Sb3+Sb5+2O6(OH) |
| 4.DH.20 | Monimolite | Pb2Sb5+2O7 |
| 4.DH.25 | Rosiaite | PbSb5+2O6 |
| 4.DH.30 | Stefanweissite | (Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14 |
| 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.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) |
Fluorescence of Cesiokenopyrochlore
non-fluorescent
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 Cesiokenopyrochlore
mindat.org URL:
https://www.mindat.org/min-51565.html
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References for Cesiokenopyrochlore
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2017) New minerals and nomenclature modifications approved in 2017. CNMNC Newsletter No 36. Mineralogical Magazine, 81 (2) 403-409 doi:10.1180/minmag.2017.081.022
Localities for Cesiokenopyrochlore
Showing 1 localities.
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The 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).
All localities listed without proper references should be considered as questionable.
Madagascar (TL) | |
| Mineralogical Magazine +2 other references |
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