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Fetiasite Mineral Data

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General Fetiasite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Fe+++,Ti++++)3O2(As+++2O5)
Help on Composition: Composition: Molecular Weight = 426.99 gm
   Titanium   3.36 %  Ti    5.61 % TiO2
   Iron      35.31 %  Fe   30.29 % FeO / 16.83 % Fe2O3
   Arsenic   35.09 %  As   46.33 % As2O3
   Oxygen    26.23 %  O
            ______        ______ 
            100.00 %       99.06 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+1.8Fe3+0.9Ti0.3O2As2O5
Help on Environment: Environment: Alpine mineral fissures.
Help on IMA Status: IMA Status: Approved IMA 1994
Help on Locality: Locality: On the eastern slopes of Pizzo Cervandome, Italy. Near Gorb, Binntal, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the Fe, Ti, and As in its chemical composition.
Help on Name Pronunciation: Name Pronunciation: Fetiasite + Pronunciation Say FETIASITE
Help on Synonym: Synonym: ICSD 75307
  PDF 47-1855

Fetiasite Image

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Comments: Sub metallic grayish black crystals of fetiasite on matrix.
Location: Gorb, Binntal, Wallis (Valais), Switzerland. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Fetiasite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.2552:1:2.7542
Help on Cell Dimensions: Cell Dimensions: a = 10.625, b = 3.264, c = 8.99, Z = 2; beta = 109.25° V = 294.34 Den(Calc)= 4.82
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.749(1), 2.814(0.94), 2.391(0.85),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 1) ( 1 0 0) ( 0 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Fetiasite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Brown, Black.
Help on Density: Density: 4.6
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5 - Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: ochre brown

Optical Properties of Fetiasite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 2.16 - from Gladstone-Dale relationship (KC = 0.2409) where Ncalc=Dcalc*KC+1
NCalc= 2.11 - from Gladstone-Dale relationship (KC = 0.2409) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Noted along grain boundaries.
Help on RL Color: RL Color: Creamy white.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Fetiasite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   15.40   16.00 
 546 nm   15.30   15.80 
 589 nm   14.80   15.20 
 650 nm   14.20   15.00 
Calculated Relative Intensity Colors of Fetiasite in Air
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540% 600%

Calculated Properties of Fetiasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.49 gm/cc
note: Specific Gravity of Fetiasite =4.82 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEFetiasite = 35.96 barns/electron
U=PEFetiasite x rElectron Density= 161.38 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fetiasite is Not Radioactive

Fetiasite Classification

Help on  Dana Class: Dana Class: (45)Acid and normal Antimonites, Arsenites and Phosphites
  (45.01)with miscellaneous formulae
  (45.01.13)Dana Group Fetiasite (Fe,Fe,Ti)3O2(As2O5) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 04.JB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JB -Arsenites, antimonites, bismuthites; with additional anions, without H2O
04.JB.05 Fetiasite (Fe,Fe,Ti)3O2(As2O5) P 21/m 2/m

Other Fetiasite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.79,p996-1002,1994) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Fetiasite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 04.JB.05





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