Detailed sheet

brookite

Discovered in 1825 by Levy, its name honors the English mineralogist Henry James Brooke (1771-1857).
It is a crystalline form of titanium oxide, such as rutile and anatase.



CHEMICAL CHARACTERISTICS

TiO2

titanium dioxide



PHYSICAL CHARACTERISTICS

Main color

brown

Other colors

yellow, black, red

Color of streak

white, grey, yellow

Luster

adamantine

Hardness

5.5 to 6.0

Density

4.07 to 4.20

Cleavage

indistinct

Fracture

uneven



OPTICAL PROPERTIES

Transparency

opaque, translucent

transparent on some splinters

Refractive index

2.580 - 2.700

Double refraction

0.110

very high, biaxial (+)

visible double refraction

No

Dispersion

0.130(0.15)

Pleochroism

weak

Number of colors

2

yellow - orange

brookite spectrum system

Fluorescence

none



CRYSTALS PROPERTIES

tabular finishing in edges, sometimes biterminal

crystals system

orthorhombic



OTHER INFORMATIONS

Exploited
sites

It is found in France in the Massif de l’Oisans (Isère), Brazil, Argentina, Russia (Siberia), United States (Alaska, Nevada, Oregon, California, Washington, Arkansas, Arizona), in Canada in Mont Saint-Hilaire, England, Germany, Afghanistan.

use in jewelry

a collection stone, it is cut in facets

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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