

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.
Venez visitez
notre site web
voillot-joaillier.fr
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