Cesiokenopyrochlore (original) (raw)

A valid IMA mineral species

Formula:

◻Nb2(O,OH)6(Cs,◻)

(◻∼ 0.20); simplified formula of the holotype: □2(Nb,W,Ta)Σ2O6Cs

Specific Gravity:

5.984 (Calculated)

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:51565:0

199826ab-bfd8-451b-8590-02ac9d3ea679

IMA Classification of CesiokenopyrochloreHide

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IMA Formula:

◻Nb2(O,OH)6Cs1-x

Type description reference:

Agakhanov, Atali A., Kasatkin, Anatoly V., Britvin, Sergey N., Siidra, Oleg I., Pautov, Leonid A., Pekov, Igor V., Karpenko, Vladimir Yu. (2021) Cesiokenopyrochlore, the First Natural Niobate with an Inverse Pyrochlore Structure. The Canadian Mineralogist, 59 (1) 149-157 doi:10.3749/canmin.2000056

Classification of CesiokenopyrochloreHide

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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

Mineral SymbolsHide

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

Physical Properties of CesiokenopyrochloreHide

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Hardness:

VHN100=567 - 625 kg/mm2 (15 s test time) - Vickers

Fracture:

Irregular/Uneven

Density:

5.984 g/cm3 (Calculated)

Comment:

Could not be measured

Optical Data of CesiokenopyrochloreHide

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Colour in reflected light:

Light gray

Internal Reflections:

Strong, light-brown

Pleochroism:

Non-pleochroic

Chemistry of CesiokenopyrochloreHide

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Mindat Formula:

◻Nb2(O,OH)6(Cs,◻)

(◻∼ 0.20); simplified formula of the holotype: □2(Nb,W,Ta)Σ2O6Cs

Crystallography of CesiokenopyrochloreHide

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Class (H-M):

m_3_m _(_4/_m_32/m ) - Hexoctahedral

Cell Parameters:

a = 10.444(1) Å

Unit Cell V:

1,139.20 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

From Type Description.

Geological EnvironmentHide

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Type Occurrence of CesiokenopyrochloreHide

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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:

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Agakhanov, A.A., Kasatkin, A.V., Britvin, S.N., Siidra, O.I., Pautov, L.A., Pekov, I.V., Karpenko, V.Yu. (2021): Cesiokenopyrochlore, the first natural niobate with inverse pyrochlore structure. The Canadian Mineralogist: 59(1): 149–157.

Synonyms of CesiokenopyrochloreHide

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Relationship of Cesiokenopyrochlore to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of CesiokenopyrochloreHide

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Other InformationHide

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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 CesiokenopyrochloreHide

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References for CesiokenopyrochloreHide

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Reference List:

Agakhanov, Atali A., Kasatkin, Anatoly V., Britvin, Sergey N., Siidra, Oleg I., Pautov, Leonid A., Pekov, Igor V., Karpenko, Vladimir Yu. (2021) Cesiokenopyrochlore, the First Natural Niobate with an Inverse Pyrochlore Structure. The Canadian Mineralogist, 59 (1) 149-157 doi:10.3749/canmin.2000056

Localities for CesiokenopyrochloreHide

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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

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- 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.