brookite
brookite crystal from Afghanistan
canal like inclusions and healing fissures
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
APPROACHING GEMS
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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