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Davidite-(La)

Pictures (3 Images total)

Davidit-(La)
Views (File:
1133731317
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Davidit-(La)
Größe: 36x35x10mm; Fundort: Bektau Ata, Karaganda, Kasachstan
Copyright: Rob Lavinsky; Contribution: Chris18
Location: Kasachstan/Qaraghandy oblysy (Karaganda)/Bektau Ata
Mineral: Davidite-(La)
Image: 1133731317
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Davidit-(La)

Größe: 36x35x10mm; Fundort: Bektau Ata, Karaganda, Kasachstan

Copyright: Rob Lavinsky
Contribution: Chris18 2005-12-04
Locality: Bektau Ata / Qaraghandy oblysy (Karaganda) / Kasachstan
Davidit-(La)-Kristall
Views (File:
1153096452
): 2382
Davidit-(La)-Kristall
Bildbreite: 12mm; Fundort: Tujetsch, Graubünden, Schweiz
Copyright: Stephan Wolfsried; Contribution: slugslayer
Location: Schweiz/Graubünden, Kanton/Surselva, Region/Tujetsch (Tavetsch)
Mineral: Davidite-(La)
Image: 1153096452
License: Usage for Mineralienatlas project only
Davidit-(La)-Kristall

Bildbreite: 12mm; Fundort: Tujetsch, Graubünden, Schweiz

Copyright: Stephan Wolfsried
Contribution: slugslayer 2006-07-17
Locality: Tujetsch (Tavetsch) / Surselva, Region / Graubünden, Kanton / Schweiz
Davidit-La
Views (File:
1230653866
): 1936
Davidit-La
Größe: 4 mm; Fundort: Selva, Tujetsch, Graubünden, Schweiz
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Schweiz/Graubünden, Kanton/Surselva, Region/Tujetsch (Tavetsch)/Selva
Mineral: Davidite-(La)
Image: 1230653866
License: Usage for Mineralienatlas project only
Davidit-La

Größe: 4 mm; Fundort: Selva, Tujetsch, Graubünden, Schweiz

Copyright: Stephan Wolfsried
Contribution: Hg 2008-12-30
Locality: Selva / Tujetsch (Tavetsch) / Surselva, Region / Graubünden, Kanton / Schweiz

Collectors Summary

Color graubraun, dunkelbraun, schwarz
Streak color bräunlichschwarz
Lustre Glasglanz, Halbmetallglanz
Hardness (Mohs) 6
Solubility - Säuren
Crystal System trigonal, R3
Morphology flächenreich, tönnchenförmig bis dicktafelig, oft eingewachsen; derb

Chemism

Chem­ical formula

La(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38

Empir­ical formula (anal­y­sis)

La0.7Ce0.2Ca0.1Y0.75U0.25Ti15Fe3+5O38

Chem­ical com­po­si­tion

Chrom, Eisen, Lanthanum, Titan, Yttrium, Fluor, Sauerstoff, Uran, Vanadium, Wasserstoff

Unit weight: 1860.66238125 u; Number of atoms in the formula: 60

Info

Empirical formula:

La0.7Ce0.2Ca0.1Y0.75U0.25Ti15Fe5O38

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

32.68

38

63.33

15.9994300

607.9783400

Calcium

Ca

0.22

0.1

0.17

40.0784000

4.0078400

Titanium

Ti

38.59

15

25.00

47.8671000

718.0065000

Iron

Fe

15.01

5

8.33

55.8452000

279.2260000

Yttrium

Y

3.58

0.75

1.25

88.9058520

66.6793890

Lanthanum

La

5.23

0.7

1.17

138.9055200

97.2338640

Cerium

Ce

1.51

0.2

0.33

140.1161000

28.0232200

Uranium

U

3.20

0.25

0.42

238.0289130

59.5072283

Anal­y­sis wt%

TiO2 : 50.13, Fe2O3 : 27.90, Cr2O3 : 1.59, V2O5 : 3.12, PbO : 1.54, UO2 : 6.00, Ce2O3 : 2.76, La2O3 : 3.36, Ln2O3 : 0.80, Y2O3 : 2.05, Ln2O3 : 9.23 (Ref: American Mineralogist 79)

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.09-080

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

Clas­sifica­tion by Hölzel

4.CE.500

4: OXIDES
C: R2O3 Sesquioxides
E: Other complex Oxides, mostly hextrig
5: Davidite-Group

Dana 8th edi­tion

08.05.01.05

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

graubraun, dunkelbraun, schwarz

Streak color

bräunlichschwarz

Change in color

rötlich durch Alterung

Diaphane­ity (Trans­parency)

opak in dünnen Sektionen durchscheinend

Lus­tre

Glasglanz, Halbmetallglanz

RI value α / ω / n

n ≈ 2.3

Anisotropism

Isotropisch wenn metamikt

Reflec­tiv­ity: (Lambda nm) ↓, ↑, Ø

(400) 19.40, , 19.40
(420) 19.00, , 19.00
(440) 18.60, , 18.60
(460) 18.10, , 18.10
(480) 17.80, , 17.80
(500) 17.50, , 17.50
(520) 17.30, , 17.30
(540) 17.20, , 17.20
(560) 17.00, , 17.00
(580) 17.00, , 17.00
(600) 16.90, , 16.90
(620) 16.80, , 16.80
(640) 16.80, , 16.80
(660) 16.80, , 16.80
(680) 16.70, , 16.70
(700) 16.60, , 16.60

Reflection chart Davidite-(La)

Reflec­tiv­ity Ø

17.47

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3

Space Group number

148

Space Group

R3

Cell param­e­ters a (Å)

10.37

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

20.87

Cell param­e­ters a/b or c/a

2.013

Cell param­e­ters c/b

-

Z

3

Volumne (ų)

1943.617

X-Ray Pow­der Diffrac­tion

3.38(40),
2.985(40),
2.890(80),
2.838(70),
2.473(100),
2.252(60),
2.139(60),
1.443(40)

XRD chart Davidite-(La)

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

Morphol­ogy

flächenreich, tönnchenförmig bis dicktafelig, oft eingewachsen; derb

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

6

VHN (Hard­ness Vick­ers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.72 (berechnet) 4.42 (gemessen)

4.769 ( ρ calc. Mineralienatlas )

Tenac­ity

spröde

Radioac­tiv­ity

leicht radioaktiv durch Urangehalte in der Formel

Insta­bil­ity

- Säuren

Chem­ical Prop­er­ties and Tests

chemisch und durch Röntgen

Preface

Occurrences

in Pegmatiten, auf alpinen Klüften

Asso­cia­tions

Rutil, Titanit, Magnetit, Ilmenit, Apatit, Turmalin, Epidot, Albit, Calcit

Name from

Der Name ehrt Professor Tannatt William Edgeworth David (1858–1934), Australischer Geologe der Universität von Sydney, Australien

Author (Name, Year)

Mawson, 1906

Rel­evance, Usage

nur zu Sammlerzwecken

Col­lector informa­tion

Ähnliche Mineralien: Gadolinit hat einen grünlichen Strich

Safety Instructions

Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. These hazard statements refer to the classification of industrially used chemical compounds that may also occur in this natural mineral. The hazard classification makes no claim to completeness.




Safety classes: Ionizing radiation: Radioaktiv

References

Minerals and Museums 5 (2004)

IMA group assignments

Other languages

German

Davidit-(La)

Spanish

Davidita-(La)

English

Davidite-(La)

French

Davidite-(La)

Russian

Давидит-(La)

Japanese

ランタンダビッド石

CNMNC symbol

Symbol

Dvd-La

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

German pages

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

English pages

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

Russian pages

Webmineral.ru - search for: Давидит-(La)

Mineral Dealer

German pages

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Crystal-Treasure.com - search for: Davidit-(La)
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Geolitho marketplace, by and for collectors - search for: Davidit-(La)

Locations with GPS information