ammolite
pearly ammonite from Madagascar
polished ammolite from Canada
polished ammolite from Canada
polished ammolite from Canada
Detailed sheet
ammolite
Dating back 70 million years, the fossilized remains of ammonites have been known for a long time by Native Americans who used them as an amulet for hunting and for healing.
It is recognized as a gem since 1981 and its atypical iridescent appearance promotes its commercial development.
CHEMICAL CHARACTERISTICS
aragonite, calcite, silice, pyrite
fossilized ammonite shell
PHYSICAL CHARACTERISTICS
Main color
red
Other colors
blue, yellow, green
it is of all the colors in its iridescence
Color of streak
white
Luster
pearly
Hardness
4.0 to 0.0
Density
2.50 to 0.00
Cleavage
perfect
Fracture
uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.520 - 1.680
Double refraction
0.155
strong
visible double refraction
No
Pleochroism
absent
Number of colors
1
Fluorescence
weak
yellow
CRYSTALS PROPERTIES
layer a few millimeters on fossil ammonites
crystals system
orthorhombic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is mainly found in the province of Alberta in Canada for the variety used as a gemstone, it has also been reported in Tyrol in Austria.
use in jewelry
It is a stone newly available on the market, different from other gemstones, which is in high demand in North America and especially in Canada where it is put forward as a national specialty. It is used in doublet, mounted on a solid support preventing it from breaking in the first shock.
Daily care
and precautions
It is fragile, sensitive to household products, detergents, heat and shocks.
imitations and
treatments
Synthetic iridescent materials resin coated can look alike but they are very easy to detect.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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