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Alumotantite

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 8.5
Crystal System orthorhombisch, Pbcn

Chemism

Chem­ical formula

AlTaO4

Chem­ical com­po­si­tion

Aluminium, Tantal, Sauerstoff

Unit weight: 271.9271682 u; Number of atoms in the formula: 6

Info

Empirical formula:

AlTaO4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

23.53

4

66.67

15.9994300

63.9977200

Aluminium

Al

9.92

1

16.67

26.9815382

26.9815382

Tantalum

Ta

66.54

1

16.67

180.9479100

180.9479100

Anal­y­sis wt%

Ta2O5 : 81.13, Nb2O5 : 0.80, Al2O3 : 18.47 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 81)

Strunz 9th edi­tion incl. updates

4.DB.55

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
D: Metall: Sauerstoff = 1:2 und vergleichbare
B: Mit mittelgroßen [Kationen]: Ketten kantenverknüpfter Oktaeder
55:Alumotantit-Gruppe

Lapis Clas­sifica­tion

IV/D.27-030

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

Clas­sifica­tion by Hölzel

4.DK.160

4: OXIDES
D: Dioxides
K: Other Niobates, Tantalates
1: Cervantite-Group

Dana 8th edi­tion

08.01.07.01

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

Color

farblos

Streak color

weiß

max. Birefrin­gence

0.12

Birefringence chart\! Alumotantite title=Birefringence chart Alumotantite

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

2.21

Ri mean

2.210

2V angle

Biaxial (-) 66°

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

mmm

Space Group number

60

Space Group

Pbcn

Cell param­e­ters a (Å)

4.473

Cell param­e­ters b (Å)

11.308

Cell param­e­ters c (Å)

4.775

Cell param­e­ters a/b or c/a

0.396

Cell param­e­ters c/b

0.422

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

241.523

X-Ray Pow­der Diffrac­tion

5.66(50),
3.64(70),
3.13(100),
2.89(80),
2.439(50),
1.837(50),
1.649(50),
1.068(50)

XRD chart Alumotantite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

8.5

VHN (Hard­ness Vick­ers)

2035 (20g)

Density (g/cm³)

7.47 (berechnet)

7.478 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Voloshin & Men'shikov & Pakhomovskiy, 1981

References

Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 110 (1981), 338

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

Alumotantite

AlTaO4

orthorhombisch : mmm : Pbcn

4.DB.55

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

Bahianite

Al5Sb5+3O14(OH)2

monoklin : 2/m : C2/m

IV/D.27-010

Simpsonite

Al4Ta3O13(OH)

trigonal : 3 : P3

IV/D.27-020

Alumotantite

AlTaO4

orthorhombisch : mmm : Pbcn

IV/D.27-030

Rankamaite

(Na,K)3(Ta,Nb,Al)11(O,OH)31

orthorhombisch : 222 : C222

IV/D.27-040

Sosedkoite

(K,Na)5Al2(Ta,Nb)22O60

orthorhombisch : mmm : Cmmm

IV/D.27-050

Billwiseite

Sb3+5(Nb,Ta)3WO18

monoklin : 2/m : C2/c

IV/D.27-060

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

Cervantite

Sb3+Sb5+O4

orthorhombisch : mm2 : Pna21

4.DK.100

Clinocervantite

Sb3+Sb5+O4

monoklin : 2/m : C2/c

4.DK.105

Stibiocolumbite

SbNbO4

orthorhombisch : mm2 : Pc21n

4.DK.110

Stibiotantalite

Sb3+TaO4

orthorhombisch : mm2 : Pc21n

4.DK.120

Bismutotantalite

Bi(Ta,Nb)O4

orthorhombisch : mmm : Pcnn

4.DK.130

Bismutocolumbite

Bi(Nb,Ta)O4

orthorhombisch : mmm : Pcnn

4.DK.140

Rosiaite

PbSb2O6

trigonal : 3m : P31m

4.DK.150

Alumotantite

AlTaO4

orthorhombisch : mmm : Pbcn

4.DK.160

Simpsonite

Al4Ta3O13(OH)

trigonal : 3 : P3

4.DK.180

Bahianite

Al5Sb5+3O14(OH)2

monoklin : 2/m : C2/m

4.DK.190

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

Other languages

German

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Spanish

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French

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English

Alumotantite

Russian

Алюмотантит

IMA Number

IMA 1980-025

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

German pages

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English pages

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