anorthite
CHEMICAL CHARACTERISTICS
Ca[Al2Si2O8]
alumino-calcium silicate
PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
yellow, pink
Color of streak
white
Luster
vitreous
Hardness
6.0 to 6.5
Density
2.75 to 2.77
Cleavage
perfect
Fracture
uneven
some very tiny parts can be observed on the fracture, easy cleavage on a single side
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.578 - 1.590
Double refraction
0.013
weak biaxial (-)
visible double refraction
No
Pleochroism
absent
Number of colors
1
Fluorescence
none
CRYSTALS PROPERTIES
thick
crystals system
triclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found worldwide, in France at Lassur (Ariege), in the Aveyron, at Tarqmiye in Palestine, in the Taurus Mountains in Turkey, Lybia, Madagascar, Brazil …
use in jewelry
in its most colorful varieties it is faceted cut , it is a collection stone.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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