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Bismutotantalite

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Bismutotantalit
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Bismutotantalit

Größe: 59x59 mm; Fundort: Gamba Hill, Kreis Busiiro, Distrikt Wakiso, Uganda
Copyright: Rock Currier
Contribution: slugslayer 2010-05-30
Locality: Gamba Hill / Busiiro, Kreis / Wakiso, Distrikt / Uganda
Bismutotantalit
Views (Image: 1226481399): 1121
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

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

Volumne (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

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

German pages

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

English pages

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

Russian pages

 Webmineral.ru - search for: Бисмутотанталит

Mineral Dealer

German pages

 hausen - Mineralgroßhandel - search for: Bismutotantalit
Crystal-Treasure.com - search for: Bismutotantalit
Bosse - search for: Bismutotantalit
Edelsteine Neuburg - Gundolf Fischer - search for: Bismutotantalit

Locations with GPS information