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.

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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Photos of natural/un-cut material from mindat.org
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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