|
|
Tapiolite Mineral Data
|
|
|
General Tapiolite Information
|
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. |
Name Pronunciation: |
Tapiolite + Pronunciation |
|
Tapiolite Image |
Images:
|
|
Images:
|
|
Images:
|
|
Tapiolite-(Fe) Tapiolite
Comments: Ferrotapiolite crystal in white quartz and mica matrix.
Location: Quixabá Mine, Frei Martinho, Paraíba Brazil.
Scale: Crystal size 1 x 0.8 cm.
© Fabre Minerals |
|
Tapiolite Crystallography
|
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 Dipyramidal H-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
|
Cleavage: |
{110} Imperfect |
Color: |
Black. |
Density: |
8.17 |
Diaphaneity: |
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
|
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
|
|
Calculated Properties of Tapiolite
|
Electron Density: |
Bulk Density (Electron Density)=6.80 gm/cc note: Specific Gravity of Tapiolite =7.90 gm/cc. |
Fermion Index: |
Fermion Index = 0.0020815203 Boson Index = 0.9979184797 |
Photoelectric: |
PETapiolite = 795.69 barns/electron U=PETapiolite x rElectron Density=5,409.49 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tapiolite is Not Radioactive |
|
Tapiolite Classification
|
Dana Class: |
08.03.01.00 (08)Multiple Oxides with Nb, Ta, and Ti |
|
(08.03)where A (B2O6) |
|
(08.03.01)Tapiolite Series |
|
08.03.01.00 Tapiolite* (Fe,Mn)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m |
|
08.03.01.01 Tapiolite-(Fe) (Fe,Mn)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m |
|
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 |
|
04.D - Metal:Oxygen = 1:2 and similar |
|
04.DB -With medium-sized cations; chains of edge-sharing octahedra |
|
04.DB.10 Bystromite MgSb2O6 P 41/mnm 4/m 2/m 2/m |
|
04.DB.10 Tapiolite-(Fe) (Fe,Mn)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m |
|
04.DB.10 Ordonezite ZnSb2O6 P 41/mnm 4/m 2/m 2/m |
|
04.DB.10 Tapiolite-(Mn) (Mn,Fe)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m |
|
04.DB.10 Tapiolite* (Fe,Mn)(Ta,Nb)2O6 P 41/mnm 4/m 2/m 2/m |
|
Other Tapiolite Information
|
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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
11 - WWW-MINCRYST
Search for Tapiolite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Tapiolite :
Ask about Tapiolite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espa�ol
Print or Cut-and-Paste your Tapiolite Specimen Label here :
Tapiolite
(Fe,Mn)(Ta,Nb)2O6
Dana No: 08.03.01.00 Strunz No: 04.DB.10
Locality:
Notes:
|
|
|
|
|
|
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.