Ferrotapiolite Mineral Data

Ferrotapiolite Mineral Data +

General Ferrotapiolite Information

Chemical Formula:

(Fe++,Mn++)(Ta,Nb)2O6

Composition:

Molecular Weight = 500.02 gm

Tantalum 68.76 % Ta 83.96 % Ta₂O₅

Manganese 3.30 % Mn 4.26 % MnO

Niobium 0.93 % Nb 1.33 % Nb₂O₅

Iron 7.82 % Fe 10.06 % FeO

Oxygen 19.20 % O

______ ______

100.00 % 99.60 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.7Mn²⁺_0.3Ta_1.9Nb_0.05O₆

Environment:

Pegmatites and alluvial deposits.

IMA Status:

Valid Species (Pre-IMA) 1863

Locality:

Sri Lanka. Link to MinDat.org Location Data.

Name Origin:

Named after the god Tapio of Finnish mythology and the Latin ferrium - "iron."

Synonym:

ICSD 201754

PDF 23-1124

Staringite-mixture with cassiderite

Tapiolite

Ferrotapiolite Image

Images:

Ferrotapiolite

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:

Ferrotapiolite

Comments: Ferrotapiolite crystal in white quartz and mica matrix.
Location: Quixab? Mine, Frei Martinho, Para?ba Brazil. Scale: Crystal size 1 x 0.8 cm.
© Fabre Minerals

Ferrotapiolite Crystallography

Axial Ratios:

a:c = 1:1.94736

Cell Dimensions:

a = 4.75, c = 9.25, Z = 2; V = 208.70 Den(Calc)= 7.96

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),

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Forms: [ 1 1 3] [ 1 1 0] [ 1 0 0] [ 0 0 1]

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Physical Properties of Ferrotapiolite

Cleavage:

[110] Imperfect

Color:

Brownish black, Black.

Density:

7.82

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

6 - Orthoclase

Luminescence:

None.

Luster:

Metallic

Streak:

brown

Optical Properties of Ferrotapiolite

Dichroism (e):

reddish brown.

Dichroism (w):

pale yellowish.

Gladstone-Dale:

CI meas= -0.091 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.072 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.169,KPDmeas= 0.172,KC= 0.1576

Optical Data:

Uniaxial (+), w=2.27, e=2.42, bire=0.1500.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Ferrotapiolite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	17.90	17.10
420 nm	17.40	17.00
440 nm	16.90	17.20
460 nm	16.50	17.50
480 nm	16.20	17.60
500 nm	15.90	17.60
520 nm	15.60	17.50
540 nm	15.50	17.40
560 nm	15.30	17.20
580 nm	15.20	17.10
600 nm	15.10	17.00

**Calculated Relative Intensity Colors of Ferrotapiolite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	570%
R₁
R₂

Calculated Properties of Ferrotapiolite

Electron Density:

r_electron=6.83 gm/cc
note: r_{Ferrotapiolite}=7.96 gm/cc.

Fermion Index

Fermion Index = 0.00183
Boson Index = 0.99817

Photoelectric:

PE_{Ferrotapiolite}= 830.58 barns/electron
U=PE_{Ferrotapiolite} x r_electron=5,671.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferrotapiolite is Not Radioactive

Ferrotapiolite Classification

Dana Class:

8.3.1.1 (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.04-10 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.04 - Tapiolite group

IV/D.04-10 Ferrotapiolite (Fe,Mn)(Ta,Nb)2O6 P 4₁/mnm 4/m 2/m 2/m

IV/D.04-20 Manganotapiolite (Mn,Fe)(Ta,Nb)2O6 P 4₁/mnm 4/m 2/m 2/m

IV/D.04-40 Bystromite MgSb2O6 P 4₁/mnm 4/m 2/m 2/m

IV/D.04-50 Tripuhyite FeSbO4 P 4₁/mnm 4/m 2/m 2/m

IV/D.04-60 Ordonezite ZnSb2O6 P 4₁/mnm 4/m 2/m 2/m

Other Ferrotapiolite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Duda&Rejl90) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Ferrotapiolite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Ferrotapiolite

(Fe++,Mn++)(Ta,Nb)2O6
Dana No: 8.3.1.1 Strunz No: IV/D.04-10
Locality:

Notes: