analcime
analcime crystal from La Reunion in France
analcime crystal from La Reunion in France
Detailed sheet
analcime
Identified in 1797 by René Just Haüy, its name comes from the Greek “analkimos” which means “weak -that has no force”.
It is one example of a mineral that crystallizes in several crystal systems according to the order taken by its atoms …. it can be cubic, tetragonal, orthorhombic, and monoclinic too!
CHEMICAL CHARACTERISTICS
Na2[Al2Si4O12] 2H2O
hydrated sodium aluminium silicate
PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
white, grey, yellow, orange, pink, green
colored stones are the most sought
Color of streak
white
Luster
pearly, vitreous
Hardness
5.0 to 5.5
Density
2.20 to 2.30
Cleavage
indistinct
Fracture
uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.478 - 1.490
Double refraction
0.001
practically none
visible double refraction
No
Dispersion
-
Pleochroism
absent
Number of colors
1
Fluorescence
weak
colors green, blue, yellow, depending on the origins
CRYSTALS PROPERTIES
well formed, multi-faceted.
crystals system
triclinic
variable depending on temperature
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found like other zeolites in basalt cavities , in France in the Puy de Dome, in India (Poona), Paraguay, Brazil, Greenland, Alaska, Hawaii, Russia (Urals)…
use in jewelry
Faceted when it is transparent or cabochon cut when translucent It is a collection stone.
Daily care
and precautions
Fragile because of its low hardness.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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