hibonite
Detailed sheet
hibonite
Identified in Madagascar in 1956, its name honors the French geologist Paul Hibon who discovered it.
CHEMICAL CHARACTERISTICS
(Ca,Ce)[Al12O19]
calcium aluminium oxide
PHYSICAL CHARACTERISTICS
Main color
black
Other colors
brown
sometimes yellow or red shades
Color of streak
brown
Luster
adamantine, greasy
Hardness
7.5 to 8.0
Density
3.85 to 0.00
Cleavage
indistinct
Fracture
conchoidal
OPTICAL PROPERTIES
Transparency
opaque, translucent, transparent
rarely transparent
Refractive index
1.790 - 1.850
Double refraction
0.000
very weak, uniaxial (-)
visible double refraction
No
Pleochroism
absent
Number of colors
1
too often opaque black stone
Fluorescence
none
CRYSTALS PROPERTIES
well shaped hexagonal prisms sometimes doubly ending
crystals system
hexagonal
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in southern Madagascar in the province of Tulear, in Burma, Russia in Siberia, the United States in Utah. It is present in meteorites, it has been found in the United States, Africa North, Ukraine.
use in jewelry
The only gem crystals have been found in Burma, it is only a rare collection stone.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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