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Landauite (Landauit)

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Landauit
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Landauit
Bildbreite: 3 mm; Fundort: Burpala, Irkutsk Oblast, Sibirien, Russland
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Location: Russland/Ferner Osten, Föderationskreis/Burjatien (Buryatia), Republik/Burpala
Mineral: Landauite
Image: 1244237021
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Landauit

Bildbreite: 3 mm; Fundort: Burpala, Irkutsk Oblast, Sibirien, Russland

Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-06-05
Locality: Burpala / Burjatien (Buryatia), Republik / Ferner Osten, Föderationskreis / Russland

Collectors Summary

Color schwarz-met.
Streak color grau
Lustre Halbmetallglanz
Hardness (Mohs) 7.5
Crystal System trigonal, R3

Chemism

Chemical formula

(Na,Pb)(Mn2+,Y)(Zn,Fe)2(Ti,Fe3+,Nb)18(O,OH,F)O38

Chemical composition

Blei, Eisen, Mangan, Natrium, Niob, Titan, Yttrium, Zink, Fluor, Sauerstoff, Wasserstoff

Unit weight: 1868.8518271 u; Number of atoms in the formula: 61.3

Info

Empirical formula:

(Na0.75Pb0.25)(Mn0.75Y0.25)(Zn0.75Fe0.25)2(Ti0.6Fe0.3Nb0.1)18(O0.6(OH)0.3F0.1)O38

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.02

0.3

0.49

1.0079470

0.3023841

Oxygen

O

33.30

38.9

63.46

15.9994300

622.3778270

Fluorine

F

0.10

0.1

0.16

18.9984033

1.8998403

Sodium

Na

0.92

0.75

1.22

22.9897702

17.2423277

Titanium

Ti

27.66

10.8

17.62

47.8671000

516.9646800

Manganese

Mn

2.20

0.75

1.22

54.9380499

41.2035374

Iron

Fe

17.63

5.9

9.62

55.8452000

329.4866800

Zinc

Zn

5.25

1.5

2.45

65.4094000

98.1141000

Yttrium

Y

1.19

0.25

0.41

88.9058520

22.2264630

Niobium

Nb

8.95

1.8

2.94

92.9063820

167.2314876

Lead

Pb

2.77

0.25

0.41

207.2100000

51.8025000

Analysis wt%

TiO2 : 72.59, Fe2O3 : 6.77, FeO : 1.26, MnO : 4.12, ZnO : 10.85, Na2O : 1.36, K2O : 0.45, PbO : 2.10 (Ref: Canadian Mineralogist 78)

Strunz 9th edition incl. updates

4.CC.40

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
C: Metall: Sauerstoff = 2: 3,3: 5, und vergleichbare
C: Mit großen und mittelgroßen Kationen
40:Crichtonit-Gruppe

Lapis Classification

IV/C.09-010

IV: OXIDE
C: Oxide mit Verhältnis Metall : Sauerstoff = 2:3 (M2O3 und verwandte Verbindungen)
9: Crichtonit-Gruppe

Classification by Hölzel

4.CE.630

4: OXIDES
C: R2O3 Sesquioxides
E: Other complex Oxides, mostly hextrig
6: Freudenbergite-Group

Dana 8th edition

08.05.01.01

08: Multiple Oxides with Nb, Ta, and Ti
05: Multiple Oxides with Nb, Ta, and Ti
01: Crichtonite group (ABC18 T2 O38)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Crichtonite Group

Optical Properties

Color

schwarz-met.

Streak color

grau

Diaphaneity (Transparency)

opak, durchscheinend

Lustre

Halbmetallglanz

max. Birefringence

0.015

Birefringence chart\! Landauite title=Birefringence chart Landauite

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

2.373

RI value γ / ε

2.388

Ri mean

2.38

2V angle

Biaxial (-) 60°

Dispersion

schwach, r > v

Absorption

Z > Y > X

Pleochroism

stark, Schattierungen von grün

Crystallography

Crystal System

trigonal

Class (H-M)

3

Space Group number

148

Space Group

R3

Cell parameters a (Å)

10.366

Cell parameters b (Å)

-

Cell parameters c (Å)

20.77

Cell parameters a/b or c/a

2.004

Cell parameters c/b

-

Z

3

Volume (ų)

1932.812

X-Ray Powder Diffraction

3.36(60),
3.02(60),
2.83(100),
2.21(70),
2.11(90),
1.780(80),
1.582(80),
1.429(80)

XRD chart Landauite

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)

7.5

VHN (Hardness Vickers)

1650 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.42 (gemessen) 4.46 (berechnet)

4.816 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Portnov & Nikolaeva & Stolyarova, 1966

References

Minerals and Museums 5 (2004)

IMA group assignments

Other languages

German

Landauit

English

Landauite

French

Landauite

Spanish

Landauíta

Russian

Ландауит

Japanese

ランダウ鉱

CNMNC (IMA)-Number

IMA 1965-033

CNMNC symbol

Symbol

Lda

Locations with GPS information

IDs

GUSID (Global unique identifier short form) BbfiunHlwEaNaTyq4W3QUw
GUID (Global unique identifier) BAE2B705-E571-46C0-8D69-3CAAE16DD053
Database ID 2122