Tantite Mineral Data

Tantite Mineral Data +

General Tantite Information

Chemical Formula:

Ta2O5

Composition:

Molecular Weight = 441.89 gm

Tantalum 81.90 % Ta 100.00 % Ta₂O₅

Oxygen 18.10 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ta₂O₅

Environment:

Granitic pegmatites.

IMA Status:

Approved IMA 1983

Locality:

Kola region, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for its composition (Tantalum).

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Tantite Crystallography

Axial Ratios:

a:b:c =1.0026:1:9.43

Cell Dimensions:

a = 3.8, b = 3.79, c = 35.74, Z = 6; alpha = 90.92°, beta = 90.18°, gamma = 90° V = 514.66 Den(Calc)= 8.55

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: P1

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

By Intensity(I/I_o): 3.01(1), 1.844(0.9), 1.573(0.8),

Physical Properties of Tantite

Cleavage:

None

Color:

Colorless.

Density:

8.45

Diaphaniety:

Transparent

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

7 - Quartz

Luminescence:

Non-fluorescent.

Luster:

Adamantine

Streak:

white

Optical Properties of Tantite

Optical Data:

Biaxial (?)

NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.151) where Ncalc=Dcalc*KC+1
NCalc= 2.28 - from Gladstone-Dale relationship (KC = 0.151) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Observed.

RL Color:

Grayish white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Tantite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
486 nm	17.50	16.50
551 nm	17.20	15.40
589 nm	17.10	15.30
656 nm	15.40	14.20

**Calculated Relative Intensity Colors of Tantite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	590%
R₁
R₂

Calculated Properties of Tantite

Electron Density:

r_electron=7.20 gm/cc
note: r_Tantite=8.55 gm/cc.

Fermion Index

Fermion Index = 0.00018
Boson Index = 0.99982

Photoelectric:

PE_Tantite=1,001.81 barns/electron
U=PE_Tantite x r_electron=7,210.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tantite is Not Radioactive

Tantite Classification

Dana Class:

4.6.6.1 (4)Simple Oxides

(4.6)not classified

(4.6.6)Dana Group

4.6.6.1 Tantite Ta2O5 P1 1

Strunz Class:

IV/E.01-10 IV - Oxides

IV/E - Oxides with metal : oxygen < 1:2 (M2O5, MO3)

IV/E.01 - Tantite series

IV/E.01-10 Tantite Ta2O5 P1 1

Other Tantite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)

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

Tantite

Ta2O5
Dana No: 4.6.6.1 Strunz No: IV/E.01-10
Locality:

Notes: