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Yttropyrochlore-(Y) (Yttropyrochlor-(Y))

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Yttropyrochlor-(Y)
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Yttropyrochlor-(Y)
Bildbreite: 45 mm; Fundort: Zelenaya-Mogila-Pegmatit, Eliseevka, Saporischja Oblast, Ukraine
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Location: Ukraine/Saporischschja, Oblast/Pryasowske (Pryazovske), Rajon/Eliseevka-Pegmatit/Zelenaya-Mogila-Pegmatit
Mineral: Yttropyrochlore-(Y)
Image: 1245175196
License: Usage for Mineralienatlas project only
Yttropyrochlor-(Y)

Bildbreite: 45 mm; Fundort: Zelenaya-Mogila-Pegmatit, Eliseevka, Saporischja Oblast, Ukraine
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-06-16
Locality: Zelenaya-Mogila-Pegmatit / Eliseevka-Pegmatit / Pryasowske (Pryazovske), Rajon / Saporischschja, Oblast / Ukraine

Collectors Summary

Color dunkelbraun, schwarz
Streak color hellbraun
Lustre Glasglanz, Diamantglanz
Hardness (Mohs) 4.75
Cleavages fehlt
Crystal System kubisch,

Additional information / Summary

Als eigenständiges Mineral diskreditiert;

Typmaterial von Tindle & Breaks (1998) ist Oxyyttropyrochlor-(Y)

Typmaterial von Kalita (1957) ["obruchevite"] und Ercit et al. (2003) ist ein nullwertig-dominates Mineral.

Chemism

Chemical formula

(Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7

Empirical formula (analysis)

(Y,Na,Ca,U)1.27(Nb,Ta,Ti,Fe)2O5.40(OH)0.60·1.13H2O

Chemical composition

Calcium, Natrium, Niob, Tantal, Titan, Yttrium, Sauerstoff, Uran, Wasserstoff

Unit weight: 433.9470033637 u; Number of atoms in the formula: 13.26

Info

Empirical formula:

(Y0.55Na0.3Ca0.1U0.05)1.27(Nb0.55Ta0.3Ti0.1Fe0.05)2O5.40(OH)0.60·1.13H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.66

2.86

21.57

1.0079470

2.8827284
Oxygen

O

26.29

7.13

53.77

15.9994300

114.0759359
Sodium

Na

2.02

0.38

2.87

22.9897702

8.7591024
Calcium

Ca

1.17

0.13

0.96

40.0784000

5.0899568
Titanium

Ti

2.21

0.2

1.51

47.8671000

9.5734200
Iron

Fe

1.29

0.1

0.75

55.8452000

5.5845200
Yttrium

Y

14.31

0.7

5.27

88.9058520

62.1007376
Niobium

Nb

23.55

1.1

8.30

92.9063820

102.1970202
Tantalum

Ta

25.02

0.6

4.52

180.9479100

108.5687460
Uranium

U

3.48

0.06

0.48

238.0289130

15.1148360

Analysis wt%

Ø Na2O : 2.23, K2O : 0.51, CaO : 2.74, Y2O3 : 11.54, Ce2O3 : 0.90, UO3 : 10.11, Fe2O3 : 3.91, Al2O3 : 0.70, SiO2 : 3.49, TiO2 : 4.52, Nb2O5 : 37.52, Ta2O5 : 6.35, H2O : 14.37, Ln2O3 : 12.44 (Ref: Doklady Akademiia Nauk, SSSR 57)

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

Classification by Hölzel

4.CH.661

4: OXIDES
C: R2O3 Sesquioxides
H: Pyrochlore-Group, Nb-dominant on the B-site

Dana 8th edition

08.02.01.04

08: Multiple Oxides with Nb, Ta, and Ti
02: Multiple Oxides with Nb, Ta, and Ti where (A)2 (B2O6) (O,OH,F)
01: Pyrochlore Group (Pyrochlore Subgroup; Nb>Ta;(Nb+Ta)>2(Ti)

IMA status

diskreditiert - The Canadian Mineralogist Vol. 48, pp. 673-698 (2010)

Mineral status

Varietät

Variety / polytype of

Pyrochlore group

Optical Properties

Color

dunkelbraun, schwarz

Streak color

hellbraun

Diaphaneity (Transparency)

durchscheinend bis opak

Lustre

Glasglanz, Diamantglanz

RI value α / ω / n

1.830 - 1.835

Ri mean

1.833

2V angle

Isotropisch

Crystallography

Crystal System

kubisch

Cell parameters a (Å)

10.32

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

Volumne (ų)

1099.105

X-Ray Powder Diffraction

3.152(50),
2.975(100),
1.695(90),
1.550(50),
1.488(70)
XRD chart Yttropyrochlore-(Y)

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

Physical Properties

Hardness (Mohs)

4.75

Density (g/cm³)

4.07 (berechnet) 3.7 (gemessen)

5.245 ( ρ calc. Mineralienatlas )

Cleavages

fehlt

Radioactivity

radioaktiv

(Co-)Type locality

(Co-)Type locality

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kandalakscha, Rajon/Alakurtti/Alakurtti Pegmatit

Preface

Author (Name, Year)

Nefedov, 1941

References

American Mineralogist 62 (1977), 403

The Pyrochlore Supergroup of Minerals: Nomenclature; The Canadian Mineralogist Vol. 48, pp. 673-698 (2010) http://pubsites.uws.edu.au/ima-cnmnc/Atencio%20et%20al%20pyrochlore%20nomenclature.pdf

Other languages

Spanish

Itropirocloro-(Y)

German

Yttropyrochlor-(Y)

English

Yttropyrochlore-(Y)

French

Yttropyrochlore-(Y)

Russian

Иттропирохлор-(Y)

Japanese

ｲｯﾄﾘｳﾑｲｯﾄﾛﾊﾟｲﾛｸﾛｱ

Alternative Name

German

Obruchevit

Spanish

Obruchevita

English

Obruchevite

Yttropyrochlore

Locations with GPS information