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Tantite Mineral Data
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General Tantite Information
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 Chemical Formula: |
Ta2O5 |
| Composition: |
Molecular Weight = 441.89 gm |
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Tantalum 81.90 % Ta 100.00 % Ta2O5 |
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Oxygen 18.10 % O |
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______ ______ |
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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). |
| Name Pronunciation: |
Tantite  |
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Tantite Crystallography
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| 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 - Pedial H-M Symbol (1) Space Group: P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.01(1), 1.844(0.9), 1.573(0.8), |
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Physical Properties of Tantite
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| Cleavage: |
None |
| Color: |
Colorless. |
| Density: |
8.45 |
| Diaphaneity: |
Transparent |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
7 - Quartz |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Adamantine |
| Streak: |
white |
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Optical Properties of Tantite
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| Optical Data: |
Biaxial (?) |
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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 |
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∑ R1(λ) |
∑ R2(λ) |
| 486 nm |
17.50 |
16.50 |
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| 551 nm |
17.20 |
15.40 |
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| 589 nm |
17.10 |
15.30 |
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| 656 nm |
15.40 |
14.20 |
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Calculated Relative Intensity Colors of Tantite in Air
Relative
Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
540% |
590% |
| R1 |
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| R2 |
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Calculated Properties of Tantite
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| Electron Density: |
Bulk Density (Electron Density)=7.20 gm/cc
note: Specific Gravity of Tantite =8.55 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0001851717
Boson Index = 0.9998148283 |
| Photoelectric: |
PETantite =1,001.81 barns/electron
U=PETantite x rElectron Density=7,210.67 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tantite is Not Radioactive |
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Tantite Classification
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| Dana Class: |
04.06.06.01 (04)Simple Oxides |
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(04.06)not classified |
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(04.06.06)Dana Group |
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04.06.06.01 Tantite Ta2O5 P1 1 |
| Strunz Class: |
04.EA.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.E - Metal:Oxygen = < 1:2 |
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04.EA -Oxides with metal : oxygen < 1:2 (M2O5, MO3) |
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04.EA.05 Tantite Ta2O5 P1 1 |
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Other Tantite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3) |
| See Also: |
Links to other databases for Tantite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Print or Cut-and-Paste your Tantite Specimen Label here :
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Tantite
Ta2O5
Dana No: 04.06.06.01 Strunz No: 04.EA.05
Locality:
Notes:
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