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 Home / Gem Library / Natural Gemstones / Anatase May 29, 2023  

Natural Anatase
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The name anatase is derived from the Greek word anatasis, which means extension, to describe the elongated crystal habit compared to other tetragonal minerals. Anatase is one of several rutile polymorphs and is found in igneous and metamorphic rocks and as a detrital mineral in sediments. Crystalline polymorphs are materials that are chemically identical but exist in more than one crystal form.

Known Facts
Color Key: Brown, pale yellow,reddish brown, indigo, black, light green, lilac, Grey or nearly colorless, yellow brown, or blue in transmitted light.
Refractive Index: 2.488 - 2.561
Chemical Composition: TiO2
Hardness: 5.5 - 6.0
Density: 3.79 - 3.97
Crystal Group: Tetragonal

Crystals of anatase are often found with a well-developed pyramidal or tabular habit. They can be blue, red, brown, or colorless, although examples of orange, dark red, reddish-brown, and bluish green also occur. Its pleochroism is weak but more distinctive in the intensely colored specimens. The blue coloration of anatase may be due to the presence of Ti3+ and Ti2+.

Anatase is a metastable mineral form of titanium dioxide. It may change to rutile under specific thermodynamic conditions. Anatase is one of the five forms of titanium dioxide found in nature. The others are Akaogiite, Brookite, Riesite, and Rutile.

It is usually found isolated as small, sharply developed crystals. Like its thermodynamically stable cousin, rutile, it crystallizes tetragonally. The mineral is mainly encountered as a black solid, although pure material is colorless or white. Some crystals may appear opaque because of total reflection.

Due to its potential application as a semiconductor, anatase has been grown synthetically.

Anatase Anatase
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Anatase Stats/
Popularity Index: 1502676hits
Total Items: 7items
Total Weight: CTS 33.09
Cheapest: USD 62.50
Most Expensive: USD 300.00
Largest: CTS 13.82
Smallest: CTS 0.25
Last Added: 09/03/21 09:28:19

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