CHEMICAL CHARACTERISTICS
(K,Ba)[Al(Si,Al)3O8]
alumino-silicate
PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
white, yellow, red
Color of streak
white
Luster
vitreous
Hardness
6.0 to 6.5
Density
2.57 to 2.82
Cleavage
perfect
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.542 - 1.546
Double refraction
0.004
very weak, biaxial (-)
visible double refraction
No
Dispersion
-
Pleochroism
absent
Number of colors
1
Fluorescence
none
CRYSTALS PROPERTIES
prismatic
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in the United States in California, Pennsylvania, in British Colombia in Canada, in Western Australia and southern China, in Japan.
use in jewelry
collection stone cut in facets
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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