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Bismutotantalite

Pictures (2 Images total)

Bismutotantalit
Views (File:
1275209548
): 1886
Bismutotantalit
Größe: 59x59 mm; Fundort: Gamba Hill, Kreis Busiiro, Distrikt Wakiso, Uganda
Copyright: Rock Currier; Contribution: Philip Blümner
Location: Uganda/Wakiso, Distrikt/Busiiro, Kreis/Gamba Hill
Mineral: Bismutotantalite
Image: 1275209548
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Bismutotantalit

Größe: 59x59 mm; Fundort: Gamba Hill, Kreis Busiiro, Distrikt Wakiso, Uganda

Copyright: Rock Currier
Contribution: Philip Blümner 2010-05-30
Locality: Gamba Hill / Busiiro, Kreis / Wakiso, Distrikt / Uganda
Bismutotantalit
Views (File:
1226481399
): 1275
Bismutotantalit
FO: Manuel Balduino Claim, Paraiba, Brasilien; derbes schwarzgraues Aggregat; BB: 3,0 mm
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A012592, Donator: Melanie Albert
Location: Brasilien/Nordosten (Região Nordeste)/Paraíba/Borborema/Manuel Balduino Claim
Mineral: Bismutotantalite
Image: 1226481399
License: Usage for Mineralienatlas project only
Bismutotantalit (SNr: A012592)

FO: Manuel Balduino Claim, Paraiba, Brasilien; derbes schwarzgraues Aggregat; BB: 3,0 mm

Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2008-11-12
Locality: Manuel Balduino Claim / Borborema / Paraíba / Nordosten (Região Nordeste) / Brasilien

You find additional specimen at the Geolitho Museum

Collectors Summary

Color hellbraun, schwarz
Streak color gelblich braun
Hardness (Mohs) 5
Cleavages vollkommen {010}, deutlich {101}
Fracture halbmuschelig
Solubility + HF, - Säuren
Crystal System orthorhombisch, Pcnn

Chemism

Chemical formula

Bi(Ta,Nb)O4

Chemical composition

Bismut, Niob, Tantal, Sauerstoff

Unit weight: 431.91563 u; Number of atoms in the formula: 6

Info

Empirical formula:

Bi(Ta0.75Nb0.25)O4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

14.82

4

66.67

15.9994300

63.9977200

Niobium

Nb

5.38

0.25

4.17

92.9063820

23.2265955

Tantalum

Ta

31.42

0.75

12.50

180.9479100

135.7109325

Bismuth

Bi

48.38

1

16.67

208.9803820

208.9803820

Analysis wt%

Bi2O3 : 49.90, Ta2O5 : 46.00, Nb2O5 : 2.20, SiO2 : 1.40 (Ref: Neues Jahrbuch für Mineralogie, (Monatshefte) 55)

Strunz 9th edition incl. updates

4.DE.30

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
E: Mit mittelgroßen [Kationen]; Mit verschiedenen Polyedern
30:Stibiotantalit-Gruppe

Lapis Classification

IV/D.25-040

IV: OXIDE
D: Oxide mit Verhältnis Metall : Sauerstoff = 1:2 (MO2 und verwandte Verbindungen)
25: Stibiotantalit-Gruppe

Classification by Hölzel

4.DK.130

4: OXIDES
D: Dioxides
K: Other Niobates, Tantalates
1: Cervantite-Group

Dana 8th edition

08.01.06.03

08: Multiple Oxides with Nb, Ta, and Ti
01: Multiple Oxides with Nb, Ta, and Ti where A BO4
06: Stibiocolumbite Group

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

hellbraun, schwarz

Streak color

gelblich braun

Diaphaneity (Transparency)

teilweise durchscheinend bis opak

max. Birefringence

0.040

Birefringence chart\! Bismutotantalite title=Birefringence chart Bismutotantalite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

2.388

RI value β

2.403

RI value γ / ε

2.428

Ri mean

2.406

2V angle

Biaxial (+) 80°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

52

Space Group

Pcnn

Cell parameters a (Å)

4.957

Cell parameters b (Å)

11.763

Cell parameters c (Å)

5.633

Cell parameters a/b or c/a

0.421

Cell parameters c/b

0.479

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

328.456

X-Ray Powder Diffraction

3.543(20),
3.144(100),
2.938(30),
2.477(20),
2.034(10),
1.895(20),
1.734(30),
1.531(20)

XRD chart Bismutotantalite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

8.51 - 8.84 / Durchschnittlich = 8.67

8.734 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {010}, deutlich {101}

Fracture

halbmuschelig

Instability

+ HF, - Säuren

(Co-)Type locality

(Co-)Type locality

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

Preface

Author (Name, Year)

Wayland & Spencer, 1929

References

Handbook of Mineralogy (Anthony et al.), 3 (1997), 65

Other languages

German

Bismutotantalit

Spanish

Bismutotantalita

French

Bismutotantalite

English

Bismutotantalite

Russian

Бисмутотанталит

Russian

Висмутотанталит

Japanese

蒼鉛タンタル石

CNMNC symbol

Symbol

Bttl

Locations with GPS information

IDs

GUSID (Global unique identifier short form) _HRs6JsRSE62oi3DS7y30g
GUID (Global unique identifier) E86C74FC-119B-4E48-B6A2-2DC34BBCB7D2
Database ID 418