Anatase

Big Photo

Brazil
6.25 carats
© Rarestone.com

Anatase is named after Greek "anatasis" - extension, alluding to the greater length of the common pyramid as compared to other tetragonal minerals.

Anatase is polymorphous with rutile and brookite. It is very similar to rutile in lustre, hardness and density, but differs in its crystal habit and cleavage. When exposed to high temperature anatase transforms into rutile.

Rare transparent specimens are faceted into brilliant gems.

Anatase Gemstones by Colour

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

Anatase Gemstones by Size

This table shows distribution of Anatase 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:6.25 cts
Average:1.30 cts
Total photos:6
Do you have a larger Anatase? Why not upload a photo?
0.19ct to 0.80ct0.80ct to 1.40ct1.40ct to 2.01ct2.01ct to 2.61ct2.61ct to 3.22ct3.22ct to 3.83ct3.83ct to 4.43ct4.43ct to 5.04ct5.04ct to 5.64ct5.64ct to 6.25ct
General Information
Other Names/Trade Names:
Chemical Formula
TiO
 
2
Michael O’Donoghue, Gems, Sixth edition (2006)
More from other references
Photos of natural/un-cut material from mindat.org
Physical Properties of Anatase
Mohs Hardness5.5 to 6
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity3.82 to 3.97
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Cleavage QualityPerfect
Arthur Thomas, Gemstones (2009)
FractureSub-Conchoidal
Arthur Thomas, Gemstones (2009)
Heat SensitivitySensitive
Arthur Thomas, Gemstones (2009)
Optical Properties of Anatase
Refractive Index2.488 to 2.562
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Optical CharacterUniaxial/-
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Birefringence0.073
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) DoublingMore from other references
PleochroismOrange/brown stones - distinct: yellow - orange
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
DispersionOrd - 0.213 to Ext - 0.259
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Dark brown, colourless, yellow, blue, reddish, black.
Walter Schumann, Gemstones of the world (2001)
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TransparencyTransparent,Translucent
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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LustreAdamantine
Walter Schumann, Gemstones of the world (2001)
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Fluorescence & other light emissions
Fluorescence (General)Inert
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Crystallography of Anatase
Crystal SystemTetragonal
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
HabitUsually as bipyramids
Michael O’Donoghue, Gems, Sixth edition (2006)
More from other references
Geological Environment
Where found:Anatase results from the alteration of other titanium-bearing minerals and is also found in hydrothermal veins.
Michael O’Donoghue, Gems, Sixth edition (2006)
Further Information
Mineral information:Anatase information at mindat.org
Significant Gem Localities
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Kyauk-Pyat-That
          • Thurein-taung
Ted Themelis (2008) Gems & mines of Mogok
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