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Bariandite (Bariandit)

Collectors Summary

Color blauschwarz
Streak color schwarz
Crystal System monoklin, C2/c

Chemism

Chemical formula

Al0.6(V5+,V4+)8O20·9H2O

Chemical composition

Aluminium, Sauerstoff, Vanadium, Wasserstoff

Unit weight: 905.84751892 u; Number of atoms in the formula: 55.6

Info

Empirical formula:

Al0.6(V0.75V0.25)8O20·9H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

2.00

18

32.37

1.0079470

18.1430460
Oxygen

O

51.22

29

52.16

15.9994300

463.9834700
Aluminium

Al

1.79

0.6

1.08

26.9815382

16.1889229
Vanadium

V

44.99

8

14.39

50.9415100

407.5320800

Analysis wt%

V2O5 : 63.26, V2O4 : 14.19, Al2O3 : 3.75, H2O : 18.11 (Ref: Bulletin de Mineralogie 71)

Strunz 9th edition incl. updates

4.HE.20

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
H: V[5,6] Vanadate
E: Schichtvanadate (Phyllovanadate)
20:Straczekit-Gruppe

Lapis Classification

IV/G.11-010

IV: OXIDE
G: Vanadiumoxide (Polyvanadate mit V4+/5+)
11: Schichtvanadate, als typische Vanadiumbronzen

Classification by Hölzel

4.GA.840

4: OXIDES
G: Vanadin, Uranyl Oxides and Hydroxides
A: Vanadin Oxides and Hydroxides, VBronzes
8: Fibrous Bronzes Straczekite-Group

Dana 8th edition

47.03.02.04

47: Vanadium Oxysalts
03: Vanadium Oxysalts (Hydrated)
02: Straczekite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

blauschwarz

Streak color

schwarz

Diaphaneity (Transparency)

teilweise opak

RI value α / ω / n

1.85

RI value β

near

Ri mean

1.85

2V angle

Biaxial

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

11.70

Cell parameters b (Å)

3.63

Cell parameters c (Å)

29.06

Cell parameters a/b or c/a

3.223

Cell parameters c/b

8.006

Cell parameters α

90°

Cell parameters β

101.50

Cell parameters γ

90°

Z

2

Volumne (ų)

1209.43

X-Ray Powder Diffraction

14.20(100),
7.08(40),
5.72(60),
3.480(70),
3.434(70),
2.852(60),
1.939(60),
1.827(60)
XRD chart Bariandite

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

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

2.7 (gemessen)

2.487 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Gabun/Haut-Ogooué, Provinz/Mpassa, Departement/Franceville/Mounana Mine

Preface

Author (Name, Year)

Cesbron & Vachey, 1971

References

Bulletin de la Société Française Minéralogie et de Cristallographie 94 (1971), 49

Other languages

German

Bariandit

Spanish

Bariandita

English

Bariandite

French

Bariandite

Russian

Бариандит

Traditional Chinese

巴水釩礦

Simplified Chinese

巴水钒矿

Japanese

ﾊﾞﾘｱﾝﾀﾞｲﾄ

CNMNC (IMA)-Number

IMA 1970-043

CNMNC symbol

Symbol

Brd

Locations with GPS information