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Zimbabweite

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Zimbabweit
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Zimbabweit
gelbes Aggregat von Zimbabweit auf weißem Trägermaterial, St Anns Mine, Mwami, Karoi District, Mashonaland West, Simbabwe; BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Simbabwe/Mashonaland West, Provinz/Karoi (Urungwe), Distrikt/Mwami/St Ann's Mine (St Anne's Mine)
Mineral: Zimbabweite
Image: 1591717455
Rating: 1 (votes: 1)
License: Usage for Mineralienatlas project only
Zimbabweit

gelbes Aggregat von Zimbabweit auf weißem Trägermaterial, St Anns Mine, Mwami, Karoi District, Mashonaland West, Simbabwe; BB < 1 mm, analysiert

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-06-09
Locality: St Ann's Mine (St Anne's Mine) / Mwami / Karoi (Urungwe), Distrikt / Mashonaland West, Provinz / Simbabwe

Collectors Summary

Color Gelb
Streak color weiß
Hardness (Mohs) 5.0 - 5.5
Solubility - Säuren, Alkalien
Crystal System orthorhombisch, Ccmb

Chemism

Chemical formula

(Na,K)2PbAs43+(Ta,Nb,Ti)4O18

Chemical composition

Arsen, Blei, Natrium, Niob, Tantal, Titan, Kalium, Sauerstoff

Unit weight: 1413.8294407 u; Number of atoms in the formula: 29

Info

Empirical formula:

(Na0.75K0.25)2PbAs4(Ta0.6Nb0.3Ti0.1)4O18

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

20.37

18

62.07

15.9994300

287.9897400

Sodium

Na

2.44

1.5

5.17

22.9897702

34.4846553

Potassium

K

1.38

0.5

1.72

39.0983100

19.5491550

Titanium

Ti

1.35

0.4

1.38

47.8671000

19.1468400

Arsenic

As

21.20

4

13.79

74.9216020

299.6864080

Niobium

Nb

7.89

1.2

4.14

92.9063820

111.4876584

Tantalum

Ta

30.72

2.4

8.28

180.9479100

434.2749840

Lead

Pb

14.66

1

3.45

207.2100000

207.2100000

Analysis wt%

Ta2O5 : 46.50, As2O3 : 26.50, PbO : 15.00, Nb2O5 : 4.80, Na2O : 3.10, K2O : 1.50, TiO2 : 1.40, BaO : 0.40 (Ref: Bulletin de Mineralogie 86)

Strunz 9th edition incl. updates

4.JA.40

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
J: Antimonite, Bismuthite, Sulfite, Selenite, Tellurite
A: [Arsenite], [Antimonite], [Bismuthite]; ohne zusätzliche [Anionen], ohne H20
40:Zimbabweit-Gruppe

Lapis Classification

IV/J.04-010

IV: OXIDE
J: Arsenite (mit As3+)
4: Arsenite mit [AsO3] 3--Inseln

Classification by Hölzel

4.CO.280

4: OXIDES
C: R2O3 Sesquioxides
O: Pseudopyrochlore-Group
2: Tomichite-Derbylite-Group

Dana 8th edition

08.07.10.01

08: Multiple Oxides with Nb, Ta, and Ti
07: Multiple Oxides with Nb, Ta, and Ti

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

Gelb

Streak color

weiß

RI value α / ω / n

2.10>

RI value β

2.10>

RI value γ / ε

2.10>

2V angle

Biaxial (+) 80°~

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

64

Space Group

Ccmb

Cell parameters a (Å)

12.245

Cell parameters b (Å)

15.287

Cell parameters c (Å)

8.684

Cell parameters a/b or c/a

0.801

Cell parameters c/b

0.568

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

1625.552

X-Ray Powder Diffraction

3.823(50),
3.242(40),
3.195(100),
3.033(60),
2.990(70),
2.882(70),
2.548(50),
1.913(50)

XRD chart Zimbabweite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.0 - 5.5

VHN (Hardness Vickers)

470 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

6.2 (gemessen) 6.16 (berechnet)

5.777 ( ρ calc. Mineralienatlas )

Instability

- Säuren, Alkalien

Preface

Name from

dem Staat, in dem die Typlokalität liegt. Weitere Einzelheiten in Bruce Cairncross: The Where of Mineral Names: Zimbabweite, St. Anne’s Mine, Mwami, Hurungwe District Mashonaland West Province, Zimbabwe. Rocks & Minerals Volume 97, Issue 4 (2022) S. 383-386.

Author (Name, Year)

Foord & Taggart & Gaines & Grubb & Kristiansen, 1986

References

Bulletin de Minéralogie 109 (1986), 331

Other languages

German

Zimbabweit

English

Zimbabweite

French

Zimbabweite

Spanish

Zimbabweíta

Russian

Зимбабвеит

CNMNC (IMA)-Number

IMA 1984-034

CNMNC symbol

Symbol

Zbb

Locations with GPS information

IDs

GUSID (Global unique identifier short form) L2IWVCGxW0e5hdS5jcn24Q
GUID (Global unique identifier) 5416622F-B121-475B-B985-D4B98DC9F6E1
Database ID 4277