Pseudobrookite Mineral Data + Say PSEUDOBROOKITE


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General Pseudobrookite Information
Help on Chemical Formula: Chemical Formula: (Fe+++,Fe++)2(Ti,Fe++)O5
Help on Composition: Composition: Molecular Weight = 238.41 gm
   Magnesium   1.02 %  Mg    1.69 % MgO
   Titanium   15.06 %  Ti   25.13 % TiO2
   Iron       50.36 %  Fe   19.59 % FeO / 50.24 % Fe2O3
   Oxygen     33.55 %  O
             ______        ______ 
             100.00 %       96.64 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+1.5Fe2+0.4Mg0.1Ti0.75Fe2+0.25O5
Help on Environment: Environment: Magmatic, post-volcanic or young volcanic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1878
Help on Locality: Locality: Vesuvius and Etna, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek pseudo - "I mislead" and the mineral brookite.
Help on Synonym: Synonym: ICSD 69038
  PDF 41-1432
 

Pseudobrookite Image

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Pseudobrookite

Comments: Black, prismatic crystals of pseudobrookite on matrix.
Location: Sierra County, New Mexico, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Pseudobrookite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.9859:1:0.3751
Help on Cell Dimensions: Cell Dimensions: a = 9.79, b = 9.93, c = 3.725, Z = 4; V = 362.12 Den(Calc)= 4.37
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Bbmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.483(1), 2.748(0.8), 4.902(0.45),
Help on Forms: Forms:

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Forms: [ 1 2 1] [ 0 1 0] [ 1 1 1] [ 2 1 0] [ 1 0 1] [ 1 1 0] [ 1 0 0] [ 1 2 0] [ 1 3 1]

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Yang H , Hazen R M , American Mineralogist , 84 (1999) p.130-137, Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with, different ordering states, Sample P600, x(Ti) in M1 = .070, P = 0 GPa

View Additional jPOWD Structure files for Pseudobrookite
[1] [10] [11] [12] [13] [2] [3] [4] [5] [6] [7] [8] [9]
 

Physical Properties of Pseudobrookite

Help on Cleavage: Cleavage: [010] Poor
Help on Color: Color: Brownish black, Reddish brown, Black.
Help on Density: Density: 4.4
Help on Diaphaniety: Diaphaniety: 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 Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine - Metallic
Help on Streak: Streak: brown
 

Optical Properties of Pseudobrookite

Help on Optical Data: Optical Data: Biaxial (+), a=2.35-2.38, b=2.36-2.39, g=2.38-2.42, bire=0.0300-0.0400, 2V(Calc)=62-72, 2V(Meas)=50.
Help on Pleochroism (x): Pleochroism (x): yellowish brown.
Help on Pleochroism (y): Pleochroism (y): brown.
Help on Pleochroism (z): Pleochroism (z): reddish brown.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Pseudobrookite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   22.80   24.00 
   
 420 nm   21.90   23.10 
 440 nm   21.30   22.30 
 460 nm   20.50   21.40 
 480 nm   19.80   20.70 
 500 nm   19.40   20.40 
 520 nm   19.00   19.90 
 540 nm   18.50   19.30 
 560 nm   18.10   18.80 
 580 nm   17.80   18.50 
 600 nm   17.50   18.10 
 620 nm   17.30   17.90 
 640 nm   17.10   17.70 
 660 nm   17.00   17.60 
 680 nm   16.80   17.40 
 700 nm   16.70   17.30 
Calculated Relative Intensity Colors of Pseudobrookite in Air
Relative
Intensity		    0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 490%
R1                      
R2                      
 

Calculated Properties of Pseudobrookite

Help on Electron Density: Electron Density:

relectron=4.16 gm/cc
note: rPseudobrookite =4.37 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.03133
Boson Index = 0.96867
Help on Photoelectric: Photoelectric:

PEPseudobrookite = 17.92 barns/electron
U=PEPseudobrookite x relectron= 74.62 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pseudobrookite is Not Radioactive
 

Pseudobrookite Classification
Help on Dana Class: Dana Class: 7.7.1.1 (7)Multiple Oxides
  (7.7)with miscellaneous formulae
  (7.7.1)Dana Group
 
7.7.1.1 Pseudobrookite (Fe,Fe)2(Ti,Fe)O5 Bbmm 2/m 2/m 2/m
 
7.7.1.2 Armalcolite (Mg,Fe)Ti2O5 Bbmm 2/m 2/m 2/m
 
7.7.1.3 IMA2000-016! (Ti,Fe,Mg,Mn)1-xTi2O5 Pban 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: IV/C.24-20 IV - Oxides
  IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)
  IV/C.24 - Aramcolite - Arizonite series
 
IV/C.24-10 Armalcolite (Mg,Fe)Ti2O5 Bbmm 2/m 2/m 2/m
 
IV/C.24-20 Pseudobrookite (Fe,Fe)2(Ti,Fe)O5 Bbmm 2/m 2/m 2/m
 
IV/C.24-30 Pseudorutile Fe2Ti3O9 P 322 3 2
 

Other Pseudobrookite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Pseudobrookite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - Crocoite.com Mineral Locations 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 - HyperPhysics 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 -University of Colorado - Mineral Structure Data 16 - University of Manchester - Mineral Structure 17 - WWW-MINCRYST 18 -École des Mines de Paris

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

Pseudobrookite

(Fe+++,Fe++)2(Ti,Fe++)O5
Dana No: 7.7.1.1 Strunz No: IV/C.24-20
Locality:

 

Notes:

 
 
   
 
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