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Cesiokenopyrochlore

Additional Functions

Collectors Summary

Color hellbraun
Lustre Wachsglanz
Crystal System kubisch, Fd3m
Morphology Das Mineral bildet grobe, gleichförmige Kristalle von bis zu 0,05 mm Größe, die mit Béhierit und Rynersonit verwachsen sind

Chemism

Chemical formula

☐Nb2(O,OH)6Cs1−x {x ∼ 0.20}

Empirical formula (analysis)

Na0.29Ca0.06(Nb0.81W0.69Ta0.50)Σ2 [O5.93(OH)0.07]Σ6 Cs0.83

Chemical composition

Cäsium, Niob, Sauerstoff, Wasserstoff, Vakanz

Unit weight: 508.028813228 u; Number of atoms in the formula: 9.25

Info

Empirical formula:

Na0.29Ca0.06(Nb0.81W0.69Ta0.50)[O5.93(OH)0.07]Cs0.83

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.01

0.07

0.76

1.0079470

0.0705563

Oxygen

O

18.90

6

64.86

15.9994300

95.9965800

Sodium

Na

1.31

0.29

3.14

22.9897702

6.6670334

Calcium

Ca

0.47

0.06

0.65

40.0784000

2.4047040

Niobium

Nb

14.81

0.81

8.76

92.9063820

75.2541694

Caesium

Cs

21.71

0.83

8.97

132.9054520

110.3115252

Tantalum

Ta

17.81

0.5

5.41

180.9479100

90.4739550

Tungsten

W

24.97

0.69

7.46

183.8410000

126.8502900

Analysis wt%

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

Strunz 9th edition incl. updates

4.DH.15

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
H: Mit großen (± mittelgroßen) [Kationen]; Lagen kantenverknüpfter Oktaeder
15:Pyrochlor-Gruppe

IMA status

anerkannt - CNMNC Newsletter 36, 2017

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Pyrochlore supergroup  ⇒ Pyrochlore group

Optical Properties

Color

hellbraun

Additional color information

Im Auflicht ist es hellgrau, isotrop, mit starken hellbraunen Innenreflexionen.

Diaphaneity (Transparency)

durchscheinend

Lustre

Wachsglanz

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

227

Space Group

Fd3m

Cell parameters a (Å)

10.444(1)

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volume (ų)

1139.202

Crystal structure

Pyrochlor-Supergruppe, Struktur bestimmt

X-Ray Powder Diffraction

6.03(37),
3.70(9),
3.15(100),
3.02(35),
2.012(17),
1.848(19),
1.576(11),
1.361(9)

XRD chart Cesiokenopyrochlore

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphology

Das Mineral bildet grobe, gleichförmige Kristalle von bis zu 0,05 mm Größe, die mit Béhierit und Rynersonit verwachsen sind

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

ber. 5,984

5.924 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Madagaskar/Vàkinankàratra, Region/Betafo, Distrikt/Andrembesoa/Tetezantsio-Andoabatokely-Pegmatit/Tetezantsio Pegmatit (Antetezantsio Pegmatit)

Type material

Fersman Mineralogical Museum, Russian Academy of Sciences, Moskau, Russland

Collection number of type material

4954/1

Preface

Author (Name, Year)

Atali A. Agakhanov, Anatoly V. Kasatkin, Sergey N. Britvin, Oleg I. Siidra, Leonid A. Pautov, Igor V. Pekov and Vladimir Y. Karpenko (2021)

References

Agakhanov, A.A., Kasatkin, A.V., Britvin, S.N., Siidra, O.I., Pautov, L.A., Pekov, I.V. and Karpenko, V.Y. (2017) Cesiokenopyrochlore, IMA 2016-104. CNMNC Newsletter No. 36, April 2017, page 406; Mineralogical Magazine, 81, 403–409.

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

IMA group assignments

Other languages

German

Cesiokenopyrochlor

English

Cesiokenopyrochlore

CNMNC (IMA)-Number

IMA 2016-104

CNMNC symbol

Symbol

Ckpcl

IDs

GUSID (Global unique identifier short form) 4RlRJnoMhkCxK4qOEIvNOg
GUID (Global unique identifier) 265119E1-0C7A-4086-B12B-8A8E108BCD3A
Database ID 8317