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Stibiobetafite

Collectors Summary

Color dunkelbraun, schwarz braun
Streak color bräunlich weiß
Hardness (Mohs) 5
Cleavages fehlt
Crystal System kubisch, Fd3m

Additional information / Summary

Černý et al. (1979) definierte Stibiobetafit als das Sb3+ Analog von Betafit; Das Typmaterial hatte Nb + Ta > Ti Atome pro Formeleinheit und Ca ist das dominate Element der dominanten Valenz-Gruppe der A-Seite. Das Typmaterial wurde als Oxycalciopyrochlor bestimmt.

Chemism

Chemical formula

(Sb3+,Ca)2(Ti,Nb,Ta)2(O,OH)7

Chemical composition

Antimon, Calcium, Niob, Tantal, Titan, Sauerstoff, Wasserstoff

Unit weight: 465.81319845 u; Number of atoms in the formula: 12.75

Info

Empirical formula:

(Sb0.75Ca0.25)2(Ti0.6Nb0.3Ta0.1)2(O0.75(OH)0.25)7

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.38

1.75

13.73

1.0079470

1.7639073
Oxygen

O

24.04

7

54.90

15.9994300

111.9960100
Calcium

Ca

4.30

0.5

3.92

40.0784000

20.0392000
Titanium

Ti

12.33

1.2

9.41

47.8671000

57.4405200
Niobium

Nb

11.97

0.6

4.71

92.9063820

55.7438292
Antimony

Sb

39.21

1.5

11.76

121.7601000

182.6401500
Tantalum

Ta

7.77

0.2

1.57

180.9479100

36.1895820

Analysis wt%

Nb2O5 : 21.60, Ta2O5 : 19.30, TiO2 : 16.50, Al2O3 : 0.49, Sb2O3 : 23.20, SnO : 2.90, FeO : 0.60, MnO : 0.60, CaO : 14.50, H2O : 0.44 (Ref: Canadian Mineralogist 79)

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.141

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

Dana 8th edition

08.02.03.04

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

IMA status

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

Mineral status

Varietät

Variety / polytype of

Pyrochlore group

Optical Properties

Color

dunkelbraun, schwarz braun

Streak color

bräunlich weiß

Diaphaneity (Transparency)

durchscheinend bis opak

RI value α / ω / n

2.2

Ri mean

2.2

2V angle

Isotropisch

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

227

Space Group

Fd3m

Cell parameters a (Å)

10.356

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)

1110.647

X-Ray Powder Diffraction

6.05(10),
3.11(10),
2.992(100),
2.585(30),
1.830(40),
1.560(40),
1.494(10),
1.158(10)
XRD chart Stibiobetafite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

Density (g/cm³)

5.3

5.571 ( ρ calc. Mineralienatlas )

Cleavages

fehlt

(Co-)Type locality

(Co-)Type locality

Tschechien/Hochland (Kraj Vysočina)/Žd'ár nad Sázavou (Saar), Okres/Wischna (Vezná na Morave)/Vezna-Pegmatite

Preface

Author (Name, Year)

Cerny & Hawthorne & Laflamme & Hinthorne, 1979

References

Canadian Mineralogist 17 (1979), 583

The Pyrochlore Supergroup of Minerals: Nomenclature; The Canadian Mineralogist Vol. 48, pp. 673-698 (2010)

Other languages

Spanish

Estibiobetafita

German

Stibiobetafit

French

Stibiobetafite

English

Stibiobetafite

Japanese

ｽﾃｨﾋﾞｵﾍﾞﾀﾌｫｱｲﾄ

Alternative Name

Spanish

Stibiobetafita

CNMNC (IMA)-Number

IMA 1978-052

Locations with GPS information