ulexite
ulexite from California U.S.
Detailed sheet
ulexite
Named in honor of the German chemist George Ulex (1811-1883).
We notice a rare property: if the ends of a thick plate are well polished perpendicular to the longitudinal direction of its crystal fibers, they behave like optical fibers. A Printed text placed below appears on its upper surface, hence its name of ” TV- stone “.
CHEMICAL CHARACTERISTICS
NaCa[B5O6(OH)6] - 5(H2O)
hydrated sodium and calcium borate
PHYSICAL CHARACTERISTICS
Main color
white
Color of streak
white
Luster
silky
Hardness
2.0 to 2.5
Density
1.65 to 1.95
Cleavage
perfect
Fracture
fibrous
easy cleavage in the fibers direction
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.490 - 1.520
Double refraction
0.029
definite, biaxial (+)
visible double refraction
No
Pleochroism
absent
Number of colors
1
Fluorescence
moderate
green - yellowish, blue
CRYSTALS PROPERTIES
fibrous agregates
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Argentina, Canada, Chile, United States (California), Kazakhstan, Peru, Russia.
use in jewelry
it is cut cabochon, producing a speckle of the type “ cat’s-eye “, that its softness makes precarious.
Daily care
and precautions
fragile because of its softness and its cleavage.
Historical
healing properties
The “television stone” would have an effect on the eyes …and also on the bones.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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