beryllonite
beryllonite crystal from Paproke in Pakistan
Detailed sheet
beryllonite
So called because of the presence of beryllium, it was named by James Dana in 1888.
CHEMICAL CHARACTERISTICS
NaBe[PO4]
sodium beryllium phosphate
PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
yellow
pale yellowish
Color of streak
white
Luster
adamantine, vitreous
Hardness
5.5 to 6.0
Density
2.80 to 2.88
Cleavage
perfect
Fracture
conchoidal
perfect cleavage and pearly in one direction
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.522 - 1.560
Double refraction
0.010
weak biaxial (-)
visible double refraction
No
Dispersion
0.010(0.007)
Pleochroism
absent
Number of colors
1
Fluorescence
none
CRYSTALS PROPERTIES
tabular to short prismatic
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Brazil, Zimbabwe, Finland, United States, Pakistan.
use in jewelry
Colored yellow varieties are cut in facets, it is mainly a collection stone
Daily care
and precautions
fragile
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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