CHEMICAL CHARACTERISTICS
Ca[Al2Si3O10] - 3H2O
hydrated alumino-silicate of calcium
PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
white, brown, yellow, pink
Color of streak
white
Luster
vitreous
Hardness
5.0 to 5.5
Density
2.21 to 2.29
Cleavage
perfect
Fracture
uneven
silky luster when it is fibrous
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.509 - 1.525
Double refraction
0.007
weak biaxial (-)
visible double refraction
No
Dispersion
+
Pleochroism
absent
Number of colors
1
Fluorescence
variable
yellow or buish
CRYSTALS PROPERTIES
acicular in radiating tufts, sometimes completely fibrous
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It occurs in basalt cavities like other zeolites in the world.
use in jewelry
baguette cut in the direction of elongated crystals, it is a collection stone.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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