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Zaïrite (Zaireita)

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Zaïrit
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Zaïrit
Bildbreite: 4 mm, Fundort: Eta-Etu, Kobokobo, Nord-Kivu, Demokratische Republik Kongo
Copyright: Leonardus; Contribution: thdun5
Location: Demokratische Republik Kongo/Nord-Kivu, Provinz/Kobokobo, Distrikt/Eta-Etu
Mineral: Zaïrite
Image: 1377206935
License: Usage for Mineralienatlas project only
Zaïrit

Bildbreite: 4 mm, Fundort: Eta-Etu, Kobokobo, Nord-Kivu, Demokratische Republik Kongo

Copyright: Leonardus
Contribution: thdun5 2013-08-22
Locality: Eta-Etu / Kobokobo, Distrikt / Nord-Kivu, Provinz / Demokratische Republik Kongo

You find additional specimen at the Geolitho Museum

Collectors Summary

Color grünlich, grünlichweiß, gelbgrün
Streak color weiß
Hardness (Mohs) 4.5
Crystal System trigonal, R3m

Chemism

Chemical formula

Bi(Fe3+,Al)3(PO4)2(OH)6

Chemical composition

Aluminium, Bismut, Eisen, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 646.85546005 u; Number of atoms in the formula: 26

Info

Empirical formula:

Bi(Fe0.75Al0.25)3(PO4)2(OH)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.93

6

23.08

1.0079470

6.0476820

Oxygen

O

34.63

14

53.85

15.9994300

223.9920200

Aluminium

Al

3.13

0.75

2.88

26.9815382

20.2361537

Phosphorus

P

9.58

2

7.69

30.9737612

61.9475224

Iron

Fe

19.43

2.25

8.65

55.8452000

125.6517000

Bismuth

Bi

32.31

1

3.85

208.9803820

208.9803820

Analysis wt%

P2O5 : 21.93, Fe2O3 : 30.75, Al2O3 : 5.35, Bi2O3 : 28.71, BaO : 1.98, CaO : 0.72, CuO : 0.82, H2O : 9.05 (Ref: Bulletin de Mineralogie 75)

Strunz 9th edition incl. updates

8.BL.13

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
L: Mit mittelgroßen und großen [Kationen] (OH, etc.):RO4 = 3:1
13:

Lapis Classification

VII/B.36-170

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
B: Wasserfreie Phosphate, mit fremden Anionen F,Cl,O,OH
36: Mittelgroße und große Kationen: Mg-Cu-Zn und Ca-Na-K-Ba-Pb; Crandallit-Gruppe

Classification by Hölzel

8.BK.410

8: PHOSPHATES ARSENATES VANADATES
B: Phosphates (+Anions -Water)
K: Phosphatian (+AsO4) Alunites, trigonal, very large: 1,2,3,4, Vmed: 3
4: With Bi,Th Waylandite-Group

Dana 8th edition

41.05.12.03

41: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
05: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen where (A B)2 (XO4) Zq
12: Waylandite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Alunite supergroup  ⇒ Plumbogummite group with -1c

Optical Properties

Color

grünlich, grünlichweiß, gelbgrün

Streak color

weiß

Diaphaneity (Transparency)

transparent bis durchscheinend

max. Birefringence

0.01

Birefringence chart\! Zaïrite title=Birefringence chart Zaïrite

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

1.82

RI value γ / ε

1.83

Ri mean

1.823

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

166

Space Group

R3m

Cell parameters a (Å)

7.015

Cell parameters b (Å)

-

Cell parameters c (Å)

16.365

Cell parameters a/b or c/a

2.333

Cell parameters c/b

-

Z

3

Volume (ų)

697.432

X-Ray Powder Diffraction

5.71(100),
4.870(10),
3.503(40),
2.945(90),
2.851(10),
2.727(20),
2.158(10),
1.897(10)

XRD chart Zaïrite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.5

VHN (Hardness Vickers)

280 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.37

4.62 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Van Wambeke, 1975

References

Bulletin de la Société Française Minéralogie et de Cristallographie 98 (1975), 351

IMA group assignments

Other languages

German

Zaïrit

Spanish

Zaïrita

English

Zaïrite

French

Zaïrite

Alternative Name

Zaireit

Zaireita

Zaireite

CNMNC symbol

Symbol

Zaï

Locations with GPS information

IDs

GUSID (Global unique identifier short form) v1YwXAyMwUuriqP5S3cHgg
GUID (Global unique identifier) 5C3056BF-8C0C-4BC1-AB8A-A3F94B770782
Database ID 4257