Tapiolite Mineral Data + 
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- 8.3.1.0 Tapiolite * (Fe,Mn)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m
- 8.3.1.1 Ferrotapiolite (Fe,Mn)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m
- 8.3.1.2 Manganotapiolite (Mn,Fe)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m
General Tapiolite Information |
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 Chemical Formula: |
(Fe,Mn)(Ta,Nb)2O6 | ||
| Composition: |
Molecular Weight = 495.95 gm | ||
| Tantalum 65.67 % Ta 80.19 % Ta2O5 | |||
| Manganese 2.22 % Mn 2.86 % MnO | |||
| Niobium 3.75 % Nb 5.36 % Nb2O5 | |||
| Iron 9.01 % Fe 11.59 % FeO | |||
| Oxygen 19.36 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Fe2+0.8Mn2+0.2Ta1.8Nb0.2O6 | ||
| Environment: |
Pegmatites and alluvial deposits. | ||
| IMA Status: |
Not Approved IMA | ||
| Locality: |
Sukkula, Finland. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named in 1863 after the god Tapio of Finnish mythology. Now a group name. | ||
Search for Tapiolite Images | |||
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Images:
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Tapiolite Crystallography |
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| Axial Ratios: |
a:c = 1:1.9411 | ||
| Cell Dimensions: |
a = 4.754, c = 9.228, Z = 2; V = 208.56 Den(Calc)= 7.90 | ||
| Crystal System: |
Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 41/mnm | ||
| X Ray Diffraction: |
By Intensity(I/Io): 1.74(1), 2.56(0.8), 3.33(0.8), | ||
Physical Properties of Tapiolite |
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| Cleavage: |
[110] Imperfect | ||
| Color: |
Black. | ||
| Density: |
8.17 | ||
| Diaphaniety: |
Opaque | ||
| Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. | ||
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
| Hardness: |
6-6.5 - Orthoclase-Pyrite | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Metallic | ||
| Streak: |
brown | ||
Optical Properties of Tapiolite |
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| Optical Data: |
NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.1629) where Ncalc=Dcalc*KC+1 NCalc= 2.33 - from Gladstone-Dale relationship (KC = 0.1629) where Ncalc=Dmeas*KC+1 |
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Calculated Properties of Tapiolite |
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| Electron Density: |
relectron=6.80 gm/cc |
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| Fermion Index |
Fermion Index = 0.00208 Boson Index = 0.99792 |
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| Photoelectric: |
PETapiolite = 795.69 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tapiolite is Not Radioactive |
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Tapiolite Classification |
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| Dana Class: |
8.3.1.0 (8)Multiple Oxides with Nb, Ta, and Ti | ||
| (8.3)where A (B2O6) | |||
| (8.3.1)Dana Group | |||
| Strunz Class: |
IV/D.04-00 IV - Oxides | ||
| IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds) | |||
| IV/D.04 - Tapiolite group | |||
Other Tapiolite Information |
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| References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Tapiolite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST Search for Tapiolite using: Visit our Advertisers for Tapiolite : Translate Tapiolite Mineral Data : Ask about Tapiolite here : Print or Cut-and-Paste your Tapiolite Specimen Label here :
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