Tapiolite-(Fe) Mineral Data

Tapiolite-(Fe) Mineral Data
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General Tapiolite-(Fe) Information

Help on Chemical Formula: Chemical Formula: (Fe++,Mn++)(Ta,Nb)2O6
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe2+0.7Mn2+0.3Ta1.9Nb0.05O6
Help on Environment: Environment: Pegmatites and alluvial deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1863
Help on Locality: Locality: Sri Lanka. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the god Tapio of Finnish mythology and the Latin ferrium - "iron."
Help on Name Pronunciation: Name Pronunciation: Tapiolite-(Fe) + Pronunciation Say TAPIOLITE-(FE)
Help on Synonym: Synonym: Ferrotapiolite - Renamed to Tapiolite-(Fe) by Mineralogical Record, v39 (2008), p 131
  Staringite - mixture with cassiderite
 

Tapiolite-(Fe) Image

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Tapiolite-(Fe)   Tapiolite

Comments: Twinned, brown, dipyramid crystal of ferrotapiolite.
Location: Sapucaia district, Galileia, Minas Gerais, Brazil. Scale: 4.2x3.1x3.1 cm.
© Richard Dale / Dale Minerals
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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-(Fe) Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.94736
Help on Cell Dimensions: Cell Dimensions: a = 4.75, c = 9.25, Z = 2; V = 208.70 Den(Calc)= 7.96
Help on Crystal System: 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/Io): 1.74(1), 2.56(0.8), 3.33(0.8),
Click Here for Large Tapiolite-(Fe) Structure Window Crystal Structure:

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Eicher S M , Greedan J E , Lushington K J , Journal of Solid State Chemistry , 62 (1986) p.220-230, The magnetic properties of FeTa2O6. Magnetic structure and low-dimensional, behavior, Locality: synthetic

 

Physical Properties of Tapiolite-(Fe)

Help on Cleavage: Cleavage: {110} Imperfect
Help on Color: Color: Brownish black, Black.
Help on Density: Density: 7.82
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Disseminated - Occurs in small, distinct particles dispersed in matrix.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Streak: Streak: brown
 

Optical Properties of Tapiolite-(Fe)

Help on Dichroism (e): Dichroism (e): reddish brown.
Help on Dichroism (w): Dichroism (w): pale yellowish.
Help on Gladstone-Dale: 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
Ncalc = 2.23 - 2.25
Help on Optical Data: Optical Data: Uniaxial (+), w=2.27, e=2.42, bire=0.1500.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tapiolite-(Fe) 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 Tapiolite-(Fe) in Air
Relative
Intensity		    0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540% 570%
R1                        
R2                        
 

Calculated Properties of Tapiolite-(Fe)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.83 gm/cc
note: Specific Gravity of Tapiolite-(Fe) =7.96 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0018321453
Boson Index = 0.9981678547
Help on Photoelectric: Photoelectric: PETapiolite-(Fe) = 830.58 barns/electron
U=PETapiolite-(Fe) x rElectron Density=5,671.10 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tapiolite-(Fe) is Not Radioactive
 

Tapiolite-(Fe) Classification
Help on Dana Class: Dana Class: 08.03.01.01 (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
Help on Strunz Class: 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-(Fe) Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Duda&Rejl90) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Tapiolite-(Fe) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Tapiolite-(Fe)

(Fe++,Mn++)(Ta,Nb)2O6
Dana No: 08.03.01.01 Strunz No: 04.DB.10
Locality:

 

Notes: