Alumotantite Mineral Data

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.

Name Pronunciation:

Alumotantite + Pronunciation

Synonym:

ICSD 67676

PDF 47-1796

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 - Dipyramidal H-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),

Physical Properties of Alumotantite

Cleavage:

None

Color:

Colorless, White.

Diaphaneity:

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
Ncalc = 2.21

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:

Bulk Density (Electron Density)=6.49 gm/cc
note: Specific Gravity of Alumotantite =7.48 gm/cc.

Fermion Index:

Fermion Index = 0.0001928186
Boson Index = 0.9998071814

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Alumotantite is Not Radioactive

Alumotantite Classification

Dana Class:

08.01.07.01 (08)Multiple Oxides with Nb, Ta, and Ti

(08.01)where A BO4

(08.01.07)Dana Group

08.01.07.01 Alumotantite AlTaO4 P bcn 2/m 2/m 2/m

Strunz Class:

04.DB.55 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DB -With medium-sized cations; chains of edge-sharing octahedra

04.DB.55 Alumotantite AlTaO4 P bcn 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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Print or Cut-and-Paste your Alumotantite Specimen Label here :

Alumotantite

AlTaO4
Dana No: 08.01.07.01 Strunz No: 04.DB.55
Locality:

Notes:

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