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Bariomicrolite (Bariomikrolith)

Collectors Summary

Color braun, farblos, gelb, weiß, rosa braun
Streak color weiß
Hardness (Mohs) 5.25
Crystal System kubisch, Fd3m
Morphology kubisch

Additional information / Summary

Möglicherweise Hydrokenomikrolith. Der Bariomikrolith von Hogarth (1977) und der Rijkeboerit von van der Veen (1963) enhalten zu wenig Barum um den Namen zu tragen. Der Bariomikrolith welcher von Beurlen et al. (2005) untersucht wurde ist möglicherweise auch Hydrokenomikrolith.

Chemism

Chemical formula

Ba(Ta,Nb)2(O,OH)7

Empirical formula (analysis)

Ba0.3Ta1.8Nb0.2O5.3(H2O)2

Chemical composition

Barium, Niob, Tantal, Sauerstoff, Wasserstoff

Unit weight: 506.3134514 u; Number of atoms in the formula: 13.6

Info

Empirical formula:

Ba0.3Ta1.8Nb0.2O5.3(H2O)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.80

4

29.41

1.0079470

4.0317880
Oxygen

O

23.07

7.3

53.68

15.9994300

116.7958390
Niobium

Nb

3.67

0.2

1.47

92.9063820

18.5812764
Barium

Ba

8.14

0.3

2.21

137.3277000

41.1983100
Tantalum

Ta

64.33

1.8

13.24

180.9479100

325.7062380

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.CI.961

4: OXIDES
C: R2O3 Sesquioxides
I: Microlite-Group, Ta-dominant on the B-site

Dana 8th edition

08.02.02.02

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

IMA status

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

Mineral status

Mineralstatus fragwürdig

Optical Properties

Color

braun, farblos, gelb, weiß, rosa braun

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend bis opak

2V angle

Isotropisch

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

227

Space Group

Fd3m

Cell parameters a (Å)

10.570

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)

1180.932

X-Ray Powder Diffraction

6.04(80),
3.18(60),
3.034(100),
2.631(60),
2.028(30),
1.865(60),
1.784(30),
1.591(40)
XRD chart Bariomicrolite

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

Morphology

kubisch

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.25

Density (g/cm³)

5.68

5.695 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Brasilien/Südosten (Região Sudeste)/Minas Gerais/São João del Rei/Chi-Chico

Preface

Author (Name, Year)

van der Veen, 1963

References

American Mineralogist 62 (1977), 403

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

Other languages

Spanish

Bariomicrolita

English

Bariomicrolite

French

Bariomicrolite

German

Bariomikrolith

Russian

Бариомикролит

Alternative Name

Bariomicrolit

Rijkeboerit

Rijkeboerita

Rijkeboerite

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 3zGZFgRCgkWRTfkpn5Y45w
GUID (Global unique identifier) 169931DF-4204-4582-914D-F9299F9638E7
Database ID 292