Pseudobrookite Mineral Data

Pseudobrookite Mineral Data
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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 Name Pronunciation: Name Pronunciation: Pseudobrookite + Pronunciation Say PSEUDOBROOKITE
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 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 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 Gladstone-Dale: Gladstone-Dale: CI meas= -0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3158,KPDmeas= 0.3136,KC= 0.2972
Ncalc = 2.3 - 2.31
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: Bulk Density (Electron Density)=4.19 gm/cc
note: Specific Gravity of Pseudobrookite =4.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEPseudobrookite = 17.92 barns/electron
U=PEPseudobrookite x rElectron Density= 75.14 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: 07.07.01.01 (07)Multiple Oxides
  (07.07)with miscellaneous formulae
  (07.07.01)Dana Group
 
07.07.01.01 Pseudobrookite (Fe,Fe)2(Ti,Fe)O5 Bbmm 2/m 2/m 2/m
 
07.07.01.02 Armalcolite (Mg,Fe)Ti2O5 Bbmm 2/m 2/m 2/m
 
07.07.01.03 IMA2000-016! (Ti,Fe,Mg,Mn)1-xTi2O5 Pban 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 04.CB.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.C - Metal:Oxygen = 2:3, 3:5, and Similar
  04.CB -With medium-sized cations
 
04.CB.15 Armalcolite (Mg,Fe)Ti2O5 Bbmm 2/m 2/m 2/m
 
04.CB.15 Mongshanite* (Mg,Cr,Fe)2(Ti,Zr)5O12 Unk Hex
 
04.CB.15 Pseudobrookite (Fe,Fe)2(Ti,Fe)O5 Bbmm 2/m 2/m 2/m
 

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 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - University of Colorado - Mineral Structure Data
18 - WWW-MINCRYST

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

Pseudobrookite

(Fe+++,Fe++)2(Ti,Fe++)O5
Dana No: 07.07.01.01 Strunz No: 04.CB.15
Locality:

 

Notes: