Alumotantite Mineral Data

Alumotantite Mineral Data +

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General Alumotantite Information

Chemical Formula:

AlTaO4

Composition:

Molecular Weight = 271.93 gm

Tantalum 66.54 % Ta 81.25 % Ta₂O₅

Aluminum 9.92 % Al 18.75 % Al₂O₃

Oxygen 23.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

AlTaO₄

Environment:

In albitized areas of highly fractionated rare element-enriched granite pegmatites.

IMA Status:

Approved IMA 1981

Locality:

From an undisclosed locality [Leshaia pegmatite, Vuoiyarvi carbonatite complex] on the Kola Peninsula, Russia. In the Mdara mine, Bikita, Zimbabwe. From the Alta fo Giz pegmatite, near Link to MinDat.org Location Data.

Name Origin:

For ALUMinum and TANTalum in the composition.

Synonym:

ICSD 67676

PDF 47-1796

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Alumotantite Crystallography

Axial Ratios:

a:b:c =0.3955:1:0.4222

Cell Dimensions:

a = 4.473, b = 11.308, c = 4.775, Z = 4; V = 241.52 Den(Calc)= 7.48

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bcn

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.13(1), 2.88(0.6), 3.64(0.5),

Crystal Structure:

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Ercit T S , Hawthorne F C , Cerny P , The Canadian Mineralogist , 30 (1992) p.653-662, The crystal structure of alumotantite: Its relation to, the structures of simpsonite and the (Al,Ga)(Ta,Nb)O4 compounds

Physical Properties of Alumotantite

Cleavage:

None

Color:

Colorless, White.

Diaphaniety:

Transparent

Hardness:

7.5 - Garnet

Luster:

Adamantine

Streak:

white

Optical Properties of Alumotantite

Gladstone-Dale:

CI calc= 0.172 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1337,KC= 0.1615

Optical Data:

Biaxial (-), a=2, b=2, g=2, bire=0.0000, 2V(Calc)=0, 2V(Meas)=66.

RL Anisotrophism:

Observed.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Alumotantite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
486 nm	15.60	14.70
589 nm	15.40	14.60
656 nm	15.90	15.10

**Calculated Relative Intensity Colors of Alumotantite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	600%
R₁
R₂

Calculated Properties of Alumotantite

Electron Density:

r_electron=6.49 gm/cc
note: r_Alumotantite=7.48 gm/cc.

Fermion Index

Fermion Index = 0.00019
Boson Index = 0.99981

Photoelectric:

PE_Alumotantite= 789.89 barns/electron
U=PE_Alumotantite x r_electron=5,127.74 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Alumotantite is Not Radioactive

Alumotantite Classification

Dana Class:

8.1.7.1 (8)Multiple Oxides with Nb, Ta, and Ti

(8.1)where A BO4

(8.1.7)Dana Group

8.1.7.1 Alumotantite AlTaO4 P bcn 2/m 2/m 2/m

Strunz Class:

IV/D.27-30 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.27 - Bahianite - Sosedkoite series

IV/D.27-10 Bahianite Al5Sb3O14(OH)2 C 2/m 2/m

IV/D.27-20 Simpsonite Al4(Ta,Nb)3O13(OH) P 3 3

IV/D.27-30 Alumotantite AlTaO4 P bcn 2/m 2/m 2/m

IV/D.27-40 Rankamaite (Na,K,Pb,Li)3(Ta,Nb,Al)11(O,OH)30 Pban 2/m 2/m 2/m

IV/D.27-50 Sosedkoite (K,Na)5Al2(Ta,Nb)22O60 Pban 2/m 2/m 2/m

Other Alumotantite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Alumotantite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

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Alumotantite

AlTaO4
Dana No: 8.1.7.1 Strunz No: IV/D.27-30
Locality:

Notes: