Anatase

Anatase is a polymorph of titanium dioxide, meaning it has the same chemical composition (TiO2) but a different crystalline structure – specifically tetragonal.

It is typically black or brown in colour, but can have yellow and blue tones too.

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Information about Anatase

Appearance

Anatase is one of four naturally occurring polymorphs of Titanium dioxide, which include akaogiite, brookite, and rutile. Rutile is the most common of these, and is quite common in quartz from Brazil.


Uses and History

Historically anatase may also be known as oisanite or dauphinite, from the French locality of Le Bourg-d’Oisans in Dauphiné, which produces some fine specimens.

Locales

Anatase occurs in many countries worldwide, with excellent specimens found in

  • Lavrinha, Minas Gerais, Brazil
  • Le Bourg-d’Oisans, Grenoble, Dauphine, France
  • Les Rousses, Vaujany, Isère, France
  • Hardangervidda, Hordaland, Norway

 


Mineralogy

Chemistry
Titanium dioxide, TiO2.
Colours and Variations
Black, grey, blue-grey, gunmetal, reddish to yellowish brown.
Streak
Pale yellowish white
Luster
Adamantine, metallic
Transparency
Transparent to opaque
Fracture
Subconchoidal
Crystal habit
Tetragonal, often pyramidal or tabular
Mohs hardness
5.5 – 6.0
Fluorescence
Specific Gravity
3.79 – 3.97
Easiest testing method

Hazards and Warnings

Almost all rocks, minerals (and, frankly, almost all other substances on earth) can produce toxic dust when cutting, which can cause serious respiratory conditions including silicosis.

When cutting or polishing rocks, minerals, shells, etc, all work should be done wet to minimise the dust, and a suitable respirator or extraction system should be used.

 


Translations

Arabic:

  • أناتاز

Hindi:

Portuguese:

  • anatásio

Bengali:

Indonesian:

Punjabi:

English:

  • anatase

Italian:

  • anatasio

Russian:

  • анатаз

French:

Japanese:

  • アナターゼ

Spanish:

  • anatasa

German:

  • anatas

Korean:

  • 아나타제

Thai:

  • อะนาเทส

Gujurati:

Mandarin Chinese:

  • 銳鈦礦

Urdu:


Further Reading / External Links