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Brookite

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Formula:
TiO2
System:
Orthorhombic
Colour:
Brown, yellowish brown, ...
Lustre:
Adamantine, Sub-Metallic
Hardness:
5½ - 6
Name:
Named in 1825 by Serve-Dieu Abailard "Armand" Lévy in honor of Henry James Brooke [May 25, 1771 Exeter, England, UK - 1857 London, England, UK], wealthy textile manufacturer and actuary, amateur English crystallographer and mineralogist.
Brookite is one of the five forms of titanium dioxide found in nature.

Visit gemdat.org for gemological information about Brookite.

Classification of Brookite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
4.DD.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
D : With medium-sized cations; frameworks of edge-sharing octahedra
4.4.5.1

4 : SIMPLE OXIDES
4 : AX2
7.9.4

7 : Oxides and Hydroxides
9 : Oxides of Ti
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Type Occurrence of Brookite

Year of Discovery:
1825

Occurrences of Brookite

Geological Setting:
An accessory mineral in alpine veins in gneiss and schist; in contact metamorphic zones and hydrothermal veinlets; a common detrital mineral.

Physical Properties of Brookite

Adamantine, Sub-Metallic
Diaphaneity (Transparency):
Translucent, Opaque
Colour:
Brown, yellowish brown, reddish brown; dar brown to iron-black; yellowish brown to dark brown in transmitted light
Streak:
White to greyish white or yellowish white
Hardness (Mohs):
5½ - 6
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
on {120}, in traces on {001}
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
4.08 - 4.18 g/cm3 (Measured)    4.133 g/cm3 (Calculated)

Crystallography of Brookite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 5.4558Å, b = 9.1819Å, c = 5.1429Å
Ratio:
a:b:c = 0.594 : 1 : 0.56
Unit Cell Volume:
V 257.63 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Crystals typically tabular on {010}, striated parallel to [001] and elongated; pyramidal {111} or pseudohexagonal with {120} and {111} equally developed; also prismatic on [001] with {120} prominent; rarely tabular on {001}.
Twinning:
On {120}, uncertain

Crystallographic forms of Brookite

Crystal Atlas:
Image Loading
Click on an icon to view
Brookite no.1 - Goldschmidt (1913-1926)
Brookite no.45 - Goldschmidt (1913-1926)
Brookite no.78 - Goldschmidt (1913-1926)
Brookite no.86 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

Epitaxial Relationships of Brookite

Epitaxial Minerals:
RutileTiO2
Epitaxy Comments:
Rutile {110} [001] parallel to brookite {120} [001].
Rutile {110} [001] parallel to brookite {111} [001].
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.51 (100)
2.900 (90)
3.47 (80)
1.893 (30)
1.662 (30)
2.476 (25)
1.691 (20)
Comments:
Recorded on material from Magnet Cove, Arkansas, USA

Optical Data of Brookite

Type:
Biaxial (+)
RI values:
nα = 2.583 nβ = 2.584 nγ = 2.700
2V:
Calculated: 12° to 20°
Max Birefringence:
δ = 0.117
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v, very strong, with crossed axial dispersion
Pleochroism:
Weak
Comments:
Yellowish, reddish, orange to brown

Chemical Properties of Brookite

Formula:
TiO2
Essential elements:
All elements listed in formula:
Analytical Data:
Chemical analysis of material from near Mount Snowdon, Wales
TiO2   (98.59)
Fe2O3   (1.41)

sum    100.00 wt.-%
Empirical Formula:
(Ti0.99Fe0.01)=1.00O2
Common Impurities:
Fe,Ta,Nb

Relationship of Brookite to other Species

7.9.1HongquiiteTiO
7.9.2RutileTiO2
7.9.3AnataseTiO2
7.9.5GeikieliteMgTiO3
7.9.6PerovskiteCaTiO3
7.9.7KassiteCaTi2O4(OH)2
7.9.8TausoniteSrTiO3
7.9.9Crichtonite(Sr,La,Ce,Y)(Ti,Fe3+,Mn)21O38
7.9.10Lucasite-(Ce)CeTi2(O,OH)6
7.9.11Hibonite(Ca,Ce)Al12O19
7.9.12Yttrocrasite-(Y)(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6
7.9.13PyrophaniteMn2+TiO3
7.9.14IwakiiteMn2+Fe23+O4
7.9.15IlmeniteFe2+TiO3
7.9.16PseudobrookiteFe2TiO5
7.9.17UlvöspinelFe2TiO4
7.9.18PseudorutileFe2Ti3O9
7.9.19FreudenbergiteNa2(Ti,Fe)8O16
7.9.20KennedyiteMgFe23+Ti3O10
7.9.21Armalcolite(Mg,Fe2+)Ti2O5
7.9.22Högbomite(Mg,Fe)2(Al,Ti)5O10
7.9.23Qandilite(Mg,Fe)2(Ti,Fe,Al)O4
7.9.24Cafetite(Ca,Mg)(Fe,Al)2Ti4O12 · 4H2O
7.9.25Loveringite(Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38
7.9.26Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
7.9.27PrideriteK(Ti74+Fe3+)O16
7.9.28Jeppeite(K,Ba)2(Ti,Fe)6O13
7.9.29AnkangiteBa(Ti,V3+,Cr)8O16
7.9.30Ecandrewsite(Zn,Fe2+,Mn2+)TiO3
7.9.31LandauiteNaMnZn2(Ti,Fe)6Ti12O38

Other Names for Brookite

Name in Other Languages:
Czech:Brookit
Dutch:Brookiet
Italian:Brookite
Polish:Brukit
Portuguese:Brookita
Russian:Брукит
Simplified Chinese:板钛矿
Slovak:Brookit
Ukrainian:Брукіт

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Brookite

Reference List:
Haidinger (1825), Annalen der Physik 5, 162.

Des Cloizeaux (1858), Annales minéralogiques 14, 361.

Pauling and Sturdivant (1928), Zeitschrift für Kristallographie 68, 239-256.

Schröder (1928), Zeitschrift für Kristallographie 67, 485.

Arnold (1929), Zeitschrift für Kristallographie 71, 344.

Holzgang (1930), Schweizer mineralogische Mitteilungen 10, 374.

Berek and Strieder (1933), Zeitschrift für Kristallographie 86, 212.

Palache, C., Berman, H. and Frondel, C. (1944): The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides, John Wiley and Sons, Inc. (New York), 7th edition, revised and enlarged, 588-593.

Deer, W. A., Howie, R. A. and Zussman, J. (1962): Rock-forming minerals, Vol. 4, Non-Silicates, 44-47.

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

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 80.

Internet Links for Brookite

Specimens:
The following Brookite specimens are currently listed for sale on minfind.com.

Localities for Brookite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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