Tapiolite Mineral Data

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.

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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

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

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:

r_electron=6.80 gm/cc
note: r_Tapiolite=7.90 gm/cc.

Fermion Index

Fermion Index = 0.00208
Boson Index = 0.99792

Photoelectric:

PE_Tapiolite= 795.69 barns/electron
U=PE_Tapiolite x r_electron=5,409.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tapiolite is Not Radioactive

Tapiolite Classification

Dana Class:

8.3.1.0 (8)Multiple Oxides with Nb, Ta, and Ti

(8.3)where A (B2O6)

(8.3.1)Dana Group

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

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

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

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Print or Cut-and-Paste your Tapiolite Specimen Label here :

Tapiolite

(Fe,Mn)(Ta,Nb)2O6
Dana No: 8.3.1.0 Strunz No: IV/D.04-00
Locality:

Notes: