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⁺_0.2Ta_1.8Nb_0.2O₆

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:

Tapiolite Tapiolite-(Fe)

Comments: Twinned, brown, dipyramid crystal of ferrotapiolite.
Location: Sapucaia district, Galileia, Minas Gerais, Brazil. Scale: 4.2x3.1x3.1 cm.
© Richard Dale / Dale Minerals

Images:

Tapiolite Tapiolite-(Mn)

Comments: Black opaque resinous massive manganotapiolite.
Location: Skogbole Mine, Kimito, Turku ja Pori, Finland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Tapiolite Tapiolite-(Fe)

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 DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4₁/mnm

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

By Intensity(I/I_o): 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:

PE_Tapiolite= 795.69 barns/electron
U=PE_Tapiolite 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

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Ask about Tapiolite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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: