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Bismutomicrolite (Bismutomikrolith)

Collectors Summary

Color braun, grauschwarz, gelb, dunkelgrau, rosa
Streak color grauweiß
Hardness (Mohs) 5
Cleavages fehlt
Crystal System kubisch, Fd3m

Additional information / Summary

Die Zusammensetzung der Probe von Knorring & Mrose 1963 ist möglicherweise ein Gemisch. Der Bismutomikrolith der von Erichsen de Oliveira et al. (1970) und Tindle & Breaks (1998) studiert wurde ist ein nullwertig-dominantes Mitglied der Microlith-Gruppe.

Chemism

Chemical formula

(Bi,Ca)(Ta,Nb)2O6(OH)

Chemical composition

Bismut, Calcium, Niob, Tantal, Sauerstoff, Wasserstoff

Unit weight: 597.6338995 u; Number of atoms in the formula: 11

Info

Empirical formula:

(Bi0.75Ca0.25)(Ta0.75Nb0.25)2O6(OH)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.17

1

9.09

1.0079470

1.0079470
Oxygen

O

18.74

7

63.64

15.9994300

111.9960100
Calcium

Ca

1.68

0.25

2.27

40.0784000

10.0196000
Niobium

Nb

7.77

0.5

4.55

92.9063820

46.4531910
Tantalum

Ta

45.42

1.5

13.64

180.9479100

271.4218650
Bismuth

Bi

26.23

0.75

6.82

208.9803820

156.7352865

Analysis wt%

Ta2O5 : 63.10, Nb2O5 : 6.65, CaO : 3.35, Bi2O3 : 25.09, H2O : 1.50 (Ref: An.Acad.Bras.Cienc.63)

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.912

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

Dana 8th edition

08.02.02.05

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

2010 diskreditiert; Can. Min., 48 (2010),673-698.

Mineral status

Gemenge/Gemisch/Mischkristall

Optical Properties

Color

braun, grauschwarz, gelb, dunkelgrau, rosa

Streak color

grauweiß

Diaphaneity (Transparency)

durchscheinend bis opak

RI value α / ω / n

2.00>

Ri mean

2.00>

2V angle

Isotropisch

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

227

Space Group

Fd3m

Cell parameters a (Å)

10.458

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)

1143.789

X-Ray Powder Diffraction

3.14(80),
2.997(100),
1.838(90),
1.568(90),
1.503(60),
1.357(60),
1.194(60),
1.165(60)
XRD chart Bismutomicrolite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

Density (g/cm³)

6.83

6.941 ( ρ calc. Mineralienatlas )

Cleavages

fehlt

(Co-)Type locality

(Co-)Type locality

Uganda/Wakiso, Distrikt/Busiiro, Kreis/Wampewo Hill

Preface

Author (Name, Year)

von Knorring & Mrose & (1962)

References

American Mineralogist 62 (1977), 403

Other languages

Spanish

Bismutomicrolita

French

Bismutomicrolite

English

Bismutomicrolite

German

Bismutomikrolith

Russian

Висмутомикролит

Japanese

蒼鉛ﾏｲｸﾛ石

Alternative Name

Bismutomicrolit

English

Westgrenite

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 6ynV_W5FY0u0BU9WgzYglQ
GUID (Global unique identifier) FDD529EB-456E-4B63-B405-4F5683362095
Database ID 415