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Tapiolite-(Mn) Mineral Data
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General Tapiolite-(Mn) Information
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 Chemical Formula: |
(Mn++,Fe++)(Ta,Nb)2O6 |
| Composition: |
Molecular Weight = 482.71 gm |
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Calcium 0.33 % Ca 0.46 % CaO |
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Tantalum 63.73 % Ta 77.81 % Ta2O5 |
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Manganese 7.97 % Mn 10.29 % MnO |
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Niobium 5.77 % Nb 8.26 % Nb2O5 |
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Iron 2.31 % Fe 2.98 % FeO |
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Oxygen 19.89 % O |
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______ ______ |
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100.00 % 99.80 % = TOTAL OXIDE |
| Empirical Formula: |
Mn2+0.7O6Fe2+0.2Ca0.04Ta1.7Nb0.3 |
| Environment: |
Accessory mineral in a lithium-rich pegmatite dike. |
| IMA Status: |
Approved IMA 1983 |
| Locality: |
Viitaniemi pegmatite, Erajarvi area, Orivesi, Finland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the MANGANese content and relationship to ferroTAPIOLITE. |
| Name Pronunciation: |
Tapiolite-(Mn) + Pronunciation  |
| Synonym: |
Manganotapiolite - Renamed to Tapiolite-(Mn) by Mineralogical Record, v39 (2008), p 131 |
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Tapiolite-(Mn) Image |
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Images:
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Tapiolite-(Mn) Crystallography
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| Axial Ratios: |
a:c = 1:1.94708 |
| Cell Dimensions: |
a = 4.762, c = 9.272, Z = 2; V = 210.26 Den(Calc)= 7.62 |
| Crystal System: |
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 41/mnm |
| X Ray Diffraction: |
By Intensity(I/Io): 3.367(1), 1.754(0.9), 2.592(0.9), |
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Physical Properties of Tapiolite-(Mn)
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| Cleavage: |
None |
| Color: |
Dark brown, Black brown. |
| Density: |
7.72 |
| Diaphaneity: |
Translucent to Opaque |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Hardness: |
6 - Orthoclase |
| Luster: |
Sub Metallic |
| Streak: |
dark brown |
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Optical Properties of Tapiolite-(Mn)
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| Dichroism (e): |
yellowish brown. |
| Dichroism (w): |
reddish brown. |
| Optical Data: |
Uniaxial (?). |
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NCalc= 2.27 - from Gladstone-Dale relationship (KC = 0.1665) where Ncalc=Dcalc*KC+1
NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.1665) where Ncalc=Dmeas*KC+1
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| RL Bireflectance: |
Weak, light brownish gray to gray. |
| RL Color: |
Gray with strong red-brown internal reflections. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Tapiolite-(Mn) in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
16.00 |
15.70 |
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| 546 nm |
14.70 |
14.10 |
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| 589 nm |
15.00 |
14.80 |
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| 650 nm |
15.10 |
14.60 |
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Calculated Relative Intensity Colors of Tapiolite-(Mn) in Air
Relative
Intensity |
0% |
70% |
100% |
140% |
210% |
280% |
350% |
420% |
490% |
560% |
610% |
| R1 |
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| R2 |
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Calculated Properties of Tapiolite-(Mn)
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| Electron Density: |
Bulk Density (Electron Density)=6.56 gm/cc
note: Specific Gravity of Tapiolite-(Mn) =7.62 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0006669592
Boson Index = 0.9993330408 |
| Photoelectric: |
PETapiolite-(Mn) = 774.42 barns/electron
U=PETapiolite-(Mn) x rElectron Density=5,083.12 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tapiolite-(Mn) is Not Radioactive |
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Tapiolite-(Mn) Classification
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| Dana Class: |
08.03.01.02 (08)Multiple Oxides with Nb, Ta, and Ti |
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(08.03)where A (B2O6) |
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(08.03.01)Tapiolite Series |
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08.03.01.00 Tapiolite* (Fe,Mn)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m |
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08.03.01.01 Tapiolite-(Fe) (Fe,Mn)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m |
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08.03.01.02 Tapiolite-(Mn) (Mn,Fe)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m |
| Strunz Class: |
04.DB.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DB -With medium-sized cations; chains of edge-sharing octahedra |
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04.DB.10 Bystromite MgSb2O6 P 41/mnm 4/m 2/m 2/m |
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04.DB.10 Tapiolite-(Fe) (Fe,Mn)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m |
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04.DB.10 Ordonezite ZnSb2O6 P 41/mnm 4/m 2/m 2/m |
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04.DB.10 Tapiolite-(Mn) (Mn,Fe)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m |
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04.DB.10 Tapiolite* (Fe,Mn)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m |
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Other Tapiolite-(Mn) Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) |
| See Also: |
Links to other databases for Tapiolite-(Mn) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Print or Cut-and-Paste your Tapiolite-(Mn) Specimen Label here :
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Tapiolite-(Mn)
(Mn++,Fe++)(Ta,Nb)2O6
Dana No: 08.03.01.02 Strunz No: 04.DB.10
Locality:
Notes:
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