natrolite
natrolite crystals from North Canterbury, New Zealand
CHEMICAL CHARACTERISTICS
Na2Al2[Si3O10] - 2H2O
hidrated sodium aluminium silicate
PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
white, brown, grey, yellow, pink
possibly reddish
Color of streak
white
Luster
pearly, silky, vitreous
Hardness
5.0 to 5.5
Density
2.20 to 2.27
Cleavage
perfect
Fracture
uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.480 - 1.495
Double refraction
0.013
weak, biaxial (+)
visible double refraction
No
Pleochroism
absent
Number of colors
1
Fluorescence
variable
orange
CRYSTALS PROPERTIES
prismatic in needles forming spherical tufts composed of tens of crystals
crystals system
orthorhombic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in cavities of basalt like other zeolites, in India, Iin taly, Germany (Bavaria), France (Puy – de – Dome and Reunion Island).
use in jewelry
it is a collection stone, sometimes cut in facets, often baguette depenidngo mn the shape of its crystals
Daily care
and precautions
Sensitive to heat, acids, and shocks.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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