Brookite Mineral Data

Brookite Mineral Data
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General Brookite Information

Help on Chemical Formula: Chemical Formula: TiO2
Help on Composition: Composition: Molecular Weight = 79.88 gm
   Titanium  59.94 %  Ti  100.00 % TiO2
   Oxygen    40.06 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: TiO2
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1825
Help on Locality: Locality: Magnet Cove near Hot Springs, Arkansas, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the English mineralogist, Henry James Brucke (1771-1857), a London mineralogist and wool trader.
Help on Name Pronunciation: Name Pronunciation: Brookite Say BROOKITE
Help on Synonym: Synonym: ICSD 36408
  PDF 29-1360
 

Brookite Image

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Brookite

Comments: Brookite crystal group on matrix. During the 19th century this site produced some of the best brookite ever seen.
Location: Classic Welsh locality of Prenteg, Gwynedd, Wales, UK. Scale: 4 x 4.5 cm.
© Fabre Minerals

Brookite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5942:1:0.5601
Help on Cell Dimensions: Cell Dimensions: a = 5.456, b = 9.182, c = 5.143, Z = 8; V = 257.65 Den(Calc)= 4.12
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcab
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.51(1), 2.9(0.9), 3.47(0.8),
Help on Forms: Forms:

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Forms: ( 1 1 2) ( 1 1 0)

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Meagher E P , Lager G A , The Canadian Mineralogist , 17 (1979) p.77-85, Polyhedral thermal expansion in the TiO2 polymorphs: Refinement, of the crystal structures of rutile and brookite at high temperature, Sample at 25 degrees C

View Additional jPOWD Structure files for Brookite
[1] [2] [3] [4]
 

Physical Properties of Brookite

Help on Cleavage: Cleavage: {120} Indistinct
Help on Color: Color: Brown, Light brown, Dark brown, Dark reddish brown, Orange.
Help on Density: Density: 4.1 - 4.14, Average = 4.11
Help on Diaphaneity: Diaphaneity: Transparent to translucent to opaque
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: yellowish white
 

Optical Properties of Brookite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3958,KPDmeas= 0.3958,KC= 0.393
Ncalc = 2.61 - 2.63
Help on Optical Data: Optical Data: Biaxial (+), a=2.583-2.584, b=2.584-2.588, g=2.705-2.741, bire=0.1220-0.1570, 2V(Calc)=12-20, 2V(Meas)=10. Dispersion relatively strong.
 

Calculated Properties of Brookite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.92 gm/cc
note: Specific Gravity of Brookite =4.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEBrookite = 10.03 barns/electron
U=PEBrookite x rElectron Density= 39.34 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brookite is Not Radioactive
 

Brookite Classification
Help on Dana Class: Dana Class: 04.04.05.01 (04)Simple Oxides
  (04.04)with a cation charge of 4+ (A++++ O2)
  (04.04.05)Dana Group
 
04.04.05.01 Brookite TiO2 Pcab 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 04.DD.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DD -With medium-sized cations; frameworks of edge-sharing octahedra
 
04.DD.10 Brookite TiO2 Pcab 2/m 2/m 2/m
 

Other Brookite Information
Help on References: References: NAME( Lapis) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Brookite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - Franklin Minerals(Dunn)
9 - GeoScienceWorld
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - HyperPhysics
15 - MinDAT
16 - Mineralienatlas (Deutsch)
17 - Online Mineral Museum
18 - Philatelic Mineralogy
19 - QUT Mineral Atlas
20 - Ruff.Info
21 - Scandinavian mineral gallery
22 - University of Colorado - Mineral Structure Data
23 - WWW-MINCRYST

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Ask about Brookite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Brookite

TiO2
Dana No: 04.04.05.01 Strunz No: 04.DD.10
Locality:

 

Notes: