

hambergite

hambergite crystal of Madagascar

hambergite from Burma cushion cut

highlight of the splitting edges phenomenon due to the high birefringence

liquid like inclusions


CHEMICAL CHARACTERISTICS
BeBO3(OH)
beryllium borate mineral


PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
grey, yellow
Color of streak
white
Luster
vitreous
Hardness
7.5 to 0.0
Density
2.35 to 0.00
Cleavage
perfect
Fracture
conchoidal


OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.554 - 1.630
Double refraction
0.073
strong biaxial (+)
visible double refraction
Yes
Dispersion
0.015(0.010)
Pleochroism
absent
Number of colors
1
Fluorescence
variable
sometimes orange


CRYSTALS PROPERTIES
prismatic crystals elongated and many-faceted, often striated

crystals system
orthorhombic


OTHER INFORMATIONS


APPROACHING GEMS
Exploited
sites
It is found in Norway (Fjord Langesund) in Brazil, the United States, India, Madagascar (Imalo, maharitra) …
use in jewelry
it is sought after specially by collectors
Venez visitez
notre site web
voillot-joaillier.fr
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