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Liandratite

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Liandradit
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Liandradit

gelbe Krusten von Liandradit, Antsakoa I Pegmatit, Berere, Mahajanga Provinz, Madagaskar; BB 1 mm

Copyright: Joy Desor
Contribution: openpit 2020-04-30
Locality: Antsakoa-Pegmatit / Berere-Pegmatit / Tsaratanàna, Distrikt / Betsiboka, Region / Madagaskar

Collectors Summary

Hardness (Mohs) 3.5
Crystal System trigonal, P31m

Chemism

Chem­ical formula

U6+(Nb,Ta)2O8

Chem­ical com­po­si­tion

Niob, Tantal, Sauerstoff, Uran

Unit weight: 595.857881 u; Number of atoms in the formula: 11

Info

Empirical formula:

U(Nb0.75Ta0.25)2O8

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

21.48

8

72.73

15.9994300

127.9954400

Niobium

Nb

23.39

1.5

13.64

92.9063820

139.3595730

Tantalum

Ta

15.18

0.5

4.55

180.9479100

90.4739550

Uranium

U

39.95

1

9.09

238.0289130

238.0289130

Anal­y­sis wt%

UO3 : 48.73, Nb2O5 : 36.22, Ta2O5 : 15.05 (Ref: American Mineralogist 78)

Strunz 9th edi­tion incl. updates

4.DH.35

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
H: Mit großen (± mittelgroßen) [Kationen]; Lagen kantenverknüpfter Oktaeder
35:Petscheckit-Gruppe

Lapis Clas­sifica­tion

IV/D.23-020

IV: OXIDE
D: Oxide mit Verhältnis Metall : Sauerstoff = 1:2 (MO2 und verwandte Verbindungen)

Clas­sifica­tion by Hölzel

4.DJ.570

4: OXIDES
D: Dioxides
J: Titanates, Niobates and Tantalates, C large, V medium ò 2
5: Other Niobates, Tantalates

Dana 8th edi­tion

08.01.09.01

08: Multiple Oxides with Nb, Ta, and Ti
01: Multiple Oxides with Nb, Ta, and Ti where A BO4

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

RI value α / ω / n

1.83

RI value β

metam.

RI value γ / ε

1.83

Ri mean

1.83

2V angle

u(i) nd

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3m

Space Group number

162

Space Group

P31m

Cell param­e­ters a (Å)

6.36

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

4.01

Cell param­e­ters a/b or c/a

0.631

Cell param­e­ters c/b

-

Z

1

Volumne (ų)

140.472

X-Ray Pow­der Diffrac­tion

4.01(80),
3.18(100),
2.49(40),
2.00(20),
1.838(30),
1.692(20),
1.667(10),
1.200(20)

XRD chart Liandratite

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

Crystals 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

3.5

VHN (Hard­ness Vick­ers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

6.8 (gemessen)

7.043 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Mücke & Strunz, 1978

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

American Mineralogist 63 (1978), 941

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Liandratite

U6+(Nb,Ta)2O8

trigonal : 3m : P31m

4.DH.35

Petscheckite

U4+Fe2+Nb2O8

trigonal : 3m : P31m

4.DH.35

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Petscheckite

U4+Fe2+Nb2O8

trigonal : 3m : P31m

IV/D.23-010

Liandratite

U6+(Nb,Ta)2O8

trigonal : 3m : P31m

IV/D.23-020

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Irtyshite

Na2(Ta,Nb)4O11

hexagonal : 6/m, 6 : P63/m, P63

4.DJ.500

Cesplumtantite

(Cs,Na)2(Pb,Sb3+)3Ta8O24

4.DJ.510

'Ungursaite'

Ca(Ta,Nb)4O11

hexagonal : 6, 6/m : P63, P63/m

4.DJ.530

Calciotantite

CaTa4O11

hexagonal : 622 : P6322

4.DJ.540

Petscheckite

U4+Fe2+Nb2O8

trigonal : 3m : P31m

4.DJ.560

Liandratite

U6+(Nb,Ta)2O8

trigonal : 3m : P31m

4.DJ.570

Murataite-(Y)

(Y,Na)6(Zn,Fe3+)5(Ti,Nb)12(O,F,OH)43

kubisch : 43m : F43m

4.DJ.580

Changbaiite

PbNb2O6

trigonal : 3m : R3m

4.DJ.590

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Fergusonite-(Y)

YNbO4

tetragonal : 4/m : I41/a

08.01.01.01

Formanite-(Y)

YTaO4

monoklin : 2/m : P2/a

08.01.01.02

'Fergusonite-(Ce)'

CeNbO4

tetragonal : 4/m : I41/a

08.01.01.03

Yttrotantalite-(Y)

(Y,U,Fe2+)(Ta,Nb)(O,OH)4

08.01.03.01

'Yttrocolumbite-(Y)'

(Y,U,Fe2+)(Nb,Ta)O4

08.01.03.02

Ishikawaite

(U,Fe,Y)NbO4

08.01.04.01

Loranskite-(Y)

(Y,Ce,Ca)ZrTaO6

08.01.05.01

Stibiocolumbite

SbNbO4

orthorhombisch : mm2 : Pc21n

08.01.06.01

Stibiotantalite

Sb3+TaO4

orthorhombisch : mm2 : Pc21n

08.01.06.02

Bismutotantalite

Bi(Ta,Nb)O4

orthorhombisch : mmm : Pcnn

08.01.06.03

Bismutocolumbite

Bi(Nb,Ta)O4

orthorhombisch : mmm : Pcnn

08.01.06.04

Alumotantite

AlTaO4

orthorhombisch : mmm : Pbcn

08.01.07.01

Wodginite

Mn2+Sn4+Ta2O8

monoklin : 2/m : C2/c

08.01.08.01

Ferrowodginite

(Fe2+,Mn2+)(Sn,Ti,Fe3+,Ta)(Ta,Nb)2O8

monoklin : 2/m : C2/c

08.01.08.02

Titanowodginite

(Mn2+,Fe2+)(Ti,Sn,Ta,Sc)(Ta,Nb)2O8

monoklin : 2/m : C2/c

08.01.08.03

Lithiowodginite

(Li,Mn,Fe)(Ta,Nb,Sn)3O8

monoklin : 2/m : C2/c

08.01.08.04

Ferrotitanowodginite

(Fe2+,Mn2+)(Ti,Sn4+,Ta,Fe3+)(Ta,Nb)2O8

monoklin : 2/m : C2/c

08.01.08.05

Liandratite

U6+(Nb,Ta)2O8

trigonal : 3m : P31m

08.01.09.01

Petscheckite

U4+Fe2+Nb2O8

trigonal : 3m : P31m

08.01.09.02

Alternative Name

German

Liandradit

Spanish

Liandradita

Liandradite

IMA Number

IMA 1975-039

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

German pages

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English pages

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