pollucite
pollucite crystal from the Isle of Elba in Italy
CHEMICAL CHARACTERISTICS
(Cs,Na)2Al2[Si4O12] - (H2O)
alumino-silicate containing cesium
PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
white, blue, brown, yellow, purple
Color of streak
white
Luster
greasy, resinous, vitreous
Hardness
6.5 to 7.0
Density
2.85 to 2.95
Cleavage
indistinct
Fracture
conchoidal
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.518 - 1.525
Double refraction
0.000
none, isotropic
visible double refraction
No
Dispersion
0,012(0.007)
Pleochroism
absent
Number of colors
1
Fluorescence
variable
can be pink - orange
CRYSTALS PROPERTIES
When it is really crystallized it’s hexoctahedral
crystals system
cubic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Pakistan, Afghanistan, Brazil (Vulture Mine), China (Jiangxi), Russia (Eastern Siberia and the Kola Péninisule), Sweden, England and the United States, Canada, Italy.
use in jewelry
faceted when transparent, it’s a collection stone
Historical
healing properties
.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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