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
Other
Gems
Envie d’acquérir
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