Lithiotantite Mineral Data

Lithiotantite Mineral Data +

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General Lithiotantite Information

Chemical Formula:

Li(Ta,Nb)3O8

Composition:

Molecular Weight = 611.75 gm

Lithium 1.13 % Li 2.44 % Li₂O

Tantalum 66.55 % Ta 81.26 % Ta₂O₅

Niobium 11.39 % Nb 16.29 % Nb₂O₅

Oxygen 20.92 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

LiTa_2.25Nb_0.75O₈

Environment:

In microcline-albite zones of granite pegmatites.

IMA Status:

Approved IMA 1983

Locality:

Undisclosed locality [Kalba Mountians] in eastern Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for LITHIum and TANTalum in the composition.

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Lithiotantite Crystallography

Axial Ratios:

a:b:c =1.4758:1:3.0243

Cell Dimensions:

a = 7.444, b = 5.044, c = 15.255, Z = 4; beta = 107.18° V = 547.23 Den(Calc)= 7.42

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 2.96(1), 1.45(0.8), 1.722(0.8),

Physical Properties of Lithiotantite

Cleavage:

None

Color:

Colorless, Pink.

Density:

Diaphaniety:

Transparent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Adamantine

Streak:

white

Optical Properties of Lithiotantite

Gladstone-Dale:

CI meas= 0.261 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.302 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1213,KPDmeas= 0.1286,KC= 0.1739

Optical Data:

Biaxial (?), a=1.9

RL Anisotrophism:

Weak.

RL Color:

Creamy pink to brownish pink next to cassiterite; grayish white otherwise.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Lithiotantite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
486 nm	18.60	18.50
553 nm	18.50	18.30
589 nm	18.60	18.30
656 nm	19.10	19.00

**Calculated Relative Intensity Colors of Lithiotantite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%	480%
R₁
R₂

Calculated Properties of Lithiotantite

Electron Density:

r_electron=6.00 gm/cc
note: r_{Lithiotantite}=7.00 gm/cc.

Fermion Index

Fermion Index = 0.00103
Boson Index = 0.99897

Photoelectric:

PE_{Lithiotantite}= 818.91 barns/electron
U=PE_{Lithiotantite} x r_electron=4,910.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lithiotantite is Not Radioactive

Lithiotantite Classification

Dana Class:

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

(8.7)Dana Type

(8.7.7)Dana Group

8.7.7.1 Lithiotantite Li(Ta,Nb)3O8 P 2₁/c 2/m

Strunz Class:

IV/D.26-10 IV - Oxides

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

IV/D.26 - Lithiotantite - Cesplumtantite series

IV/D.26-10 Lithiotantite Li(Ta,Nb)3O8 P 2₁/c 2/m

IV/D.26-20 Natrotantite Na2Ta4O11 R 3-c 3 2/m

IV/D.26-30 Irtyshite Na2(Ta,Nb)4O11 P 6₃/m 6/m

IV/D.26-40 Calciotantite Ca(Ta,Nb)4O11 P 6₃22 6 2 2

IV/D.26-50 Ungursaite? NaCa5(Ta,Nb)24O65(OH) P 6₃/m,P 6₃ Hex

IV/D.26-60 Cesplumtantite (Cs,Na,Ca)2(Pb,Sb,Sn)3Ta8O24 Unk Tetra

Other Lithiotantite Information

References:

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

See Also:

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

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Lithiotantite

Li(Ta,Nb)3O8
Dana No: 8.7.7.1 Strunz No: IV/D.26-10
Locality:

Notes: