villiaumite
villiaumite from Ile de Los In Guinea, rectangular cut
Detailed sheet
villiaumite
Its name honors Maxime Villiaume, French soldier and explorer who made collections of minerals from Madagascar and Guinea.
The villiaumite was found in its samples coming from Guinea (Rouma Island). For gemologists: watch this stone has an significant polarization abnormality, while being isotropic.
CHEMICAL CHARACTERISTICS
NaF
sodium fluoride
PHYSICAL CHARACTERISTICS
Main color
red
Other colors
colourless, orange, pink
Color of streak
white, pink
Luster
vitreous
Hardness
3.5 to 4.0
Density
4.20 to 0.00
Cleavage
perfect
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.327 - 0.000
Double refraction
0.000
none, isotropic but some crystals exhibit polarization anomalies
visible double refraction
No
Pleochroism
strong
Number of colors
2
yellow, red
Fluorescence
strong
red
CRYSTALS PROPERTIES
often massive
crystals system
cubic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is also found in Namibia (Windhoek), near Lake Magadi in Kenya, in the Kola Peninsula in Russia, in Canada (Mont St. Hilaire), United States (Springer, New Mexico).
use in jewelry
cut in facets in its red and orange varieties
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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