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Bismutomicrolite

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

Volumne (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

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Bismutomikrolith
Google-Bilder-Suche - search for: Bismutomikrolith
Mineralienatlas.de (Forum) - search for: Bismutomikrolith

English pages

Mindat - search for: Bismutomicrolite
Webmineral - search for:Bismutomicrolite
Handbook-of-Mineralogy - search for: Bismutomicrolite
RRUFF - Raman, XRD and other mineral data - search for: Bismutomicrolite
RRUFF - References and PDF downloads - search for: Bismutomicrolite
American-Mineralogist-Crystal-Structure-Database - search for: Bismutomicrolite
Strahlen.org - search for: Bismutomicrolite

Russian pages

Webmineral.ru - search for: Висмутомикролит

Mineral Dealer

German pages

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Geolitho marketplace, by and for collectors - search for: Bismutomikrolith

Locations with GPS information