Brookite

Big Photo

Afghanistan
.22 carats
© raregemhunter

Brookite is named after Henry James Brooke, English mineralogist.

Brookite is yellowish brown to reddish brown with metallic adamantine lustre.

Brookite is rarely faceted as a gemstone because it seldom occurs in sizes and shapes suitable for working.
2 photos

Brookite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 

Brookite Gemstones by Size

This table shows distribution of Brookite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.19 cts
Heaviest:.22 cts
Average:0.20 cts
Total photos:2
Do you have a larger Brookite? Why not upload a photo?
0.19ct to 0.19ct0.19ct to 0.20ct0.20ct to 0.20ct0.20ct to 0.20ct0.20ct to 0.21ct0.21ct to 0.21ct0.21ct to 0.21ct0.21ct to 0.21ct0.21ct to 0.22ct0.22ct to 0.22ct
General Information
Chemical Formula
TiO
 
2
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Physical Properties of Brookite
Mohs Hardness5.5 to 6
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity3.87 to 4.14
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Cleavage QualityIndistinct
Arthur Thomas, Gemstones (2009)
FractureSub-Conchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Brookite
Refractive Index2.583 to 2.741
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterBiaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.117 to 0.158
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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PleochroismNil
Arthur Thomas, Gemstones (2009)
DispersionStrong
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Yellowish-brown, red-brown, black
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyOpaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreAdamantine,Metallic
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Crystallography of Brookite
Crystal SystemOrthorhombic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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HabitVaried habit
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Occurs in granite, porphyry, greiss, chlorite and mica schists.
Arthur Thomas, Gemstones (2009)
Further Information
Mineral information:Brookite information at mindat.org
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